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Publicado: 1 de abril de 2023

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1

Köken, Nesrin. "Polymers containing amino bis(methylene phosphonic acid) groups for scale inhibition". Pigment & Resin Technology 48, n.º 1 (7 de enero de 2019): 73–83. http://dx.doi.org/10.1108/prt-01-2017-0007.

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Purpose The purpose of this paper is to prepare poly[allyl amino bis(methylene phosphonic acid)-ran-acrylic acid]s by two different routes. In the first route, poly(allyl amine-ran-acrylic acid)s were produced by radical copolymerization of a mixture of ally amine and acrylic acid, then converted into poly[allyl amino bis(methylene phosphonic acid)-ran-acrylic acid]s by the Mannich reaction with a mixture of formaldehyde and phosphonic acid. In the second route, allyl amino bis(methylene phosphonic acid) monomer was synthesized and copolymerised with acrylic acid. The aim of this work is to produce low-molecular-weight copolymer with the low amount of nitrogen and phosphorous having better scale inhibiting performance than commercial low-molecular-weight poly(acrylic acid)s. Design/methodology/approach Poly(allyl amine-ran-acrylic acid)s were prepared by radical copolymerisation of a mixture of ally amine and acrylic acid, and the molecular weight of copolymers was regulated by using an effective chain transfer compound and the formed copolymer was reacted with a mixture of formaldehyde and phosphorous acid. Allyl amino bis(methylene phosphonic acid) monomer was prepared and then copolymerised with acrylic acid using radical initiators. Findings Poly[allyl amino bis(methylene phosphonic acid)-ran-acrylic acid] produced with both routes, especially low-molecular weight ones have better anti-scaling performance than low-molecular-weight commercial poly(acrylic acid). Research limitations/implications By using an excess of formaldehyde and phosphonic acid, a limited increase in the conversion of amine groups of poly(allyl amine-ran-acrylic acid) to amino methylene phosphonic acid groups was achieved, so unreacted amine groups were always present in the structure of the final copolymers. Practical implications The low-molecular-weight poly[allyl amino bis(methylene phosphonic acid)-ran-acrylic acid] may be used as a better anti-scaling polymer in industry. Social implications The low-molecular-weight poly[allyl amino bis(methylene phosphonic acid)-ran-acrylic acid] is an alternative polymer for scale inhibition in the water boilers. Originality/value The low-molecular-weight poly[allyl amino bis(methylene phosphonic acid)-ran-acrylic acid] copolymers containing both carboxylic acid and amino bis(methylene phosphonic acid) are more effective anti-scaling additives than poly(acrylic acid)s in water boilers.
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2

Rao, B. Venkateswara y D. M. Puri. "Copper(II) Complexes of Organophoshonic Acids-A Comparative Study". E-Journal of Chemistry 8, s1 (2011): S271—S281. http://dx.doi.org/10.1155/2011/813586.

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Polynuclear copper(II) derivatives of 1-hydroxyethylidenediphosphonic acid (HEDP), 1-aminoethylidenediphosphonic acid (AEDP, H4L),α-aminobenzylidene diphosphonic acid (ABDP, H4L), 1-amino-2-carboxyethane- 1,1-diphosphonic acid (ACEDP, H5L), 1,3 diaminopropane-1,1,3,3-tetra-phosphonic acid (DAPTP, H8L), Ethylenediamine-N,N'-bis (dimethyl-methylenephosphonic) acid (EDBDMPO, H4L),o-phenylene-diamine-N,N'-bis (dimethylmethylenephosphonic) acid (PDBDMPO, H4L), diethylene triamine –N,N,N',N',N"N-penta (methylene phosphonic) acid (DETAPMPO, H10L) and diethylene triamine –N,N"-bis (dimethyl methylene phosphonic) acid (DETBDMPO, H4L) have been prepared in aqueous medium. The general formula of derivatives from elemental analysis was found to be Cu2L.XH2O (in case of AEDP, ABDP, EDBDMPO, PDBDMPO, DETBDMPO), Cu5L2.XH2O (in case of ACEDP) Cu4L.XH2O, Cu2H4L. XH2O (in case of DAPTP) and Cu5L.XH2O (in case of DETAPMPO). The electronic spectra have shown them to be six coordinated with slight distortion from octahedral geometry. Antiferromagnetism was inferred from magnetic moment data. Infrared spectral studies were carried out to determine coordination sites. EPR (Electron Paramagnetic Resonance) spectra that supports the presence of tetragonal distortion and antiferromagnetic behaviour, have also been studied.
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3

Baumgartner, Yann, Y. Maximilian Klein, Edwin C. Constable, Catherine E. Housecroft y Markus Willgert. "Cyanoacrylic- and (1-cyanovinyl)phosphonic acid anchoring ligands for application in copper-based dye-sensitized solar cells". RSC Advances 6, n.º 89 (2016): 86220–31. http://dx.doi.org/10.1039/c6ra20375b.

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Replacing phosphonic acid by (1-cyanovinyl)phosphonic acid anchors in heteroleptic bis(diimine)copper(i) dyes in DSCs gives a gain in JSC; a dye with a bpy-based anchor gives improved performance over one with a phen-based anchor.
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4

Chung, Yeong-Jin y Eui Jin. "Synthesis of Alkylenediaminoalkyl-bis-Phosphonic Acid Derivatives". Journal of the Korean Oil Chemists Society 30, n.º 1 (30 de marzo de 2013): 1–8. http://dx.doi.org/10.12925/jkocs.2013.30.1.001.

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5

Popov, Konstantin, Hannu Rönkkömäki y Lauri H. J. Lajunen. "Critical evaluation of stability constants of phosphonic acids (IUPAC Technical Report)". Pure and Applied Chemistry 73, n.º 10 (1 de octubre de 2001): 1641–77. http://dx.doi.org/10.1351/pac200173101641.

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Available experimental data on stability constants of proton and metal complexes for 10 phosphonic acids [methylphosphonic acid, 1-hydroxyethane-1,1-diylbisphosphonic acid, dichloromethylenebisphosphonic acid, amino-methanephosphonic acid, N-(phosphonomethyl)glycine, imino-N,N-bis(methylenephosphonic acid), N-methylamino-N,N-bis(methylenephosphonic acid), nitrilotris(methylenephosphonic acid), 1,2-diaminoethane-N,N,N´,N´-tetrakis-(methylenephosphonic acid), and diethylenetriamine-N,N,N´,N´´,N´´-pentakis-(methylenephosphonic acid)], published in 1950­1997, have been critically evaluated. For the latter phosphonate, all the data are rejected, as well as protonation constants [HL]/[H][L] for three other ligands. Higher-quality data are selected and presented as "Recommended" and "Provisional".
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6

Guenin, Erwann, Estelle Degache, Jean Liquier y Marc Lecouvey. "Synthesis of 1-Hydroxymethylene-1,1-bis(phosphonic acids) from Acid Anhydrides: Preparation of a New Cyclic 1-Acyloxymethylene-1,1-bis(phosphonic acid)". European Journal of Organic Chemistry 2004, n.º 14 (julio de 2004): 2983–87. http://dx.doi.org/10.1002/ejoc.200400053.

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7

Page, Philip C. B., Michael J. McKenzie y James A. Gallagher. "Novel Synthesis of Bis(phosphonic acid)−Steroid Conjugates". Journal of Organic Chemistry 66, n.º 11 (junio de 2001): 3704–8. http://dx.doi.org/10.1021/jo001489h.

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8

González, Lidia, Anne Ladegaard Skov y Søren Hvilsted. "PEG-Bis Phosphonic Acid Based Ionic Supramolecular Structures". Macromolecular Symposia 342, n.º 1 (agosto de 2014): 8–20. http://dx.doi.org/10.1002/masy.201300227.

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9

Kanamura, K., A. Tanaka, D. Gervasio, V. Kennedy, R. Adzic, E. B. Yeager, D. Burton y R. Guneratne. "Perfluoro‐ethylene‐1,2‐bis‐phosphonic Acid Fuel Cell Electrolyte". Journal of The Electrochemical Society 143, n.º 9 (1 de septiembre de 1996): 2765–70. http://dx.doi.org/10.1149/1.1837104.

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10

Kalchenko, Vitaly, Olga Kalchenko y Sergiy Cherenok. "Complexation of Calix[4]arene bis-Hydroxymethylenediphosphonic Acid with Amino acids. Binding Constants Determination by RP HPLC Method". French-Ukrainian Journal of Chemistry 3, n.º 2 (2015): 93–100. http://dx.doi.org/10.17721/fujcv3i2p93-100.

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Host-Guest complexation of calixarene-bis-hydroxymethylenediphosphonic acid with 17 amino acids in water solution had been studied by the RP HPLC and molecular modelling methods. It had been shown the binding constants of the complexes are depended on the nature of the amino acid residue, log P and pKa of the acids. The complexation is mainly determined by the electrostatic interactions between the positively charged nitrogen atom of the amino acid and the negatively charged oxygen atom of phosphonic acid residue of the calixarene, the Host-Guest p-p, СН-p and solvophobic interactions.
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11

Pirat, J. L., C. Brahic, C. Ciptadi, H. J. Cristau, A. Hervé y D. Virieux. "Bis(hydroxymethyl)phosphine Oxides and Hydroxymethyl Phosphinic Acids as Phosphonic Acid Analogs". Phosphorus, Sulfur, and Silicon and the Related Elements 177, n.º 8-9 (agosto de 2002): 2221–22. http://dx.doi.org/10.1080/10426500213342.

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12

YAMASHITA, Hiroshi y Toru NOZAKI. "Ion flotation of metals with [dodecyliminobis(methylene)]-bis[phosphonic acid]." NIPPON KAGAKU KAISHI, n.º 11 (1989): 1859–63. http://dx.doi.org/10.1246/nikkashi.1989.1859.

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13

Polienko, Yu F., V. I. Vinogradova, Sh Sh Sagdullaev, N. D. Abdullaev, V. A. Svyatchenko, N. N. Kiselev, V. B. Loktev y I. A. Grigor’ev. "First bis-Phosphonic Acid Derivatives of the Plant Alkaloid Cytisine". Chemistry of Natural Compounds 49, n.º 4 (septiembre de 2013): 781–82. http://dx.doi.org/10.1007/s10600-013-0744-4.

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14

Page, Philip C. B., Michael J. McKenzie y James A. Gallagher. "ChemInform Abstract: Novel Synthesis of Bis(phosphonic acid)-Steroid Conjugates." ChemInform 32, n.º 37 (24 de mayo de 2010): no. http://dx.doi.org/10.1002/chin.200137188.

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15

Houlne, Michael P., Tony S. Agent, Garry E. Kiefer, Kenneth McMillan y Darryl J. Bornhop. "Spectroscopic Characterization and Tissue Imaging Using Site-Selective Polyazacyclic Terbium(III) Chelates". Applied Spectroscopy 50, n.º 10 (octubre de 1996): 1221–28. http://dx.doi.org/10.1366/0003702963905006.

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Polyazamacrocyclic chelates of terbium are shown to be useful in diagnostic medical imaging as tissue site-selective markers. Spectroscopic properties and biodistribution are studied for three terbium(III) species: 3,6,9-tris(methylene phosphonic acid n-butyl ester)-3,6,9,15-tetraaza-bicyclo[9.3.1]pentadeca-1(15),11,13-triene (abbreviated as PCTMB); 3,6,9-tris(methylene phosphonic acid)-3,6,9,15-tetraazabicyclo[9.3.1]pentadeca-1(13),11,13-triene (abbreviated as PCTMP); and N,N'-bis(methylene phosphonic acid)-2,11-diaza [3.3]-(2,6)pyridinophane (abbreviated as BP2P). The respective aqueous molar absorptivities are found to be 3424, 2513, and 3281/2210 L mole−1 cm−1. Fluorescence quantum efficiency is determined against rhodamine 19 in basic ethanol and rhodamine 6G in ethanol. These values are 0.48, 0.21, and 0.40 for Tb-PCTMB, Tb-PCTMP, and Tb-BP2P, respectively. Biodistribution studies performed in Sprague–Dawley rats indicate tissue site-selectivity. Fluorescence images of bone tissues are presented and demonstrate the potential for using the lanthanide chelates to perform site-directed in vivo imaging for the early identification of abnormal tissue.
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16

Marquick, April L., Jean-Louis Montero, Aurélien Lebrun y Véronique Barragan-Montero. "Straightforward synthesis towards mono and bis-phosphonic acid functionalised β-cyclodextrins". Tetrahedron 71, n.º 10 (marzo de 2015): 1616–21. http://dx.doi.org/10.1016/j.tet.2014.12.019.

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17

Boes, Evita. "ANALISIS, IDENTIFIKASI PRECURSOR DAN HASIL DEGRADASI SENYAWA SENJATA KIMIA MENGGUNAKAN TEKNIK GAS CHROMATOGRAPHY MASS SPECTROMETRY– ELECTRON IONISASI (GCMS-EI)". Jurnal Kimia Terapan Indonesia 16, n.º 1 (10 de junio de 2014): 1–9. http://dx.doi.org/10.14203/jkti.v16i1.8.

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Telah dilakukan analisis, identifikasi precursor dan hasil degradasi senyawa senjata kimia diethyl methylphosphonat (DEMP), methyl phosphonic acid (MPA) dalam sampel air dan dimethyl methyl phosphonat (DMMP), ethyl phosphonic acid (EPA) dalam sampel tanah. Contoh yang dianalisa merupakan contoh senyawa tributilphosphat (TBP) 40 ug/mL dan poliethilene glycol 56,24 ug/mL ditambahkan sebagai background dan sampel tanah kering yang berpasir. Identifikasi dilakukan dengan metode kromatografi gas spektrometri massa - elektron ionisani (GCMS-EI). Ekstraksi fasa organik pada pH netral, sililasi dari fasa air yang diuapkan, di mana triethylamine/methanol-sililasi dan kation exchange-sililasi digunakan untuk ekstraksi senyawa - senyawa precursor dan hasil degradasi sebelum diinjeksikan ke GCMS. Dari hasil analisis diperoleh waktu retensi 8,9 dan 10,97 menit masing - masing untuk diethyl methylphosphonat dan bis(trimethylsilyl) methylphosphonate dalam sampel air sedangkan dalam sampel tanah 6,62 dan 12,06 menit untuk dimethyl methylphosphonat dan bis(trimethylsilyl) ethylphosphonate. Total Ion Chromatography (TIC) yang dihasilkan dari GCMS dievaluasi dengan menggunakan Library Data Base NIST (National Institute of Standards and Technology), dan AMDIS (Automated Mass Spectral Deconvolution and Identification System). Spektrum yang dihasilkan memberikan nilai base peak pada m/z = 97 untuk diethyl methylphosphonate , m/z = 225 untuk bis(trimethylsilyl) methylphosphonate, m/z = 94 untukdimethyl methylphosphonate dan m/z = 239 untuk bis(trimethylsilyl) ethylphosphonate sedangkan retention index (RI) yang dihitung digunakan untuk mengonfirmasi masing-masing senyawa precursorKata kunci : precursor, degradsi senyawa senjata kimia, base peak , waktu retensi, Total Ion KromatografiAnalysis, precursoridentification have been done and degradation compoundsof chemical weapon diethyl methylphosphonat , methyl phosphonic acid in water matrices, dimethyl methylphosphonat and ethyl phosphonic acidin soil samples. Water used for extracting those compounds was an example of simulation that contain tributilphosphat (TBP) 40 ug/mL and poliethylene glycol 56,24 ug/mL which added as a background and dry sandy soil samples. Identification was done by using Gas Chromatographic Mass Spectrometry – Electron Ionization (GCMS-EI) method. Neutral organic extraction, evaporated water - silylation, triethylamine/methanol-silylation and cation exchanged-silylation were performed to extract the precursor’s compounds from the samples, before being analyzed by gas chromatography mass spectrometry .The result of the analysis by Gas Chromatographic Mass Spectrometry method showed that the retention time (in min) was 8,9 and 10,97 for diethyl methylphosphonat and bis(trimethylsilyl) methylphosphonate in the water sample , while the retention time in soil sample was 6,62 and 12,06 for dimethyl methylphosphonat and bis(trimethylsilyl) ethylphosphonate . The result of Total Ion Chromatography (TIC) from GCMS was evaluated using NIST (National Institute of Standards and Technology) database library and AMDIS (Automated Mass Spectral Deconvolution and Identification System). The spectrum’s result gave the value of base peak, which are m/z = 97for diethyl methylphosphonat, m/z= 225 for bis(trimethylsilyl) methylphosphonate , m/z = 94 for dimethyl methylphosphonat and m/z = 239 for bis(trimethylsilyl) ethylphosphonate. On the other hand, the retention indice (RI) calculation was used to get the confirmation of each compounds of precursors. Key word : precursor, degradation of chemical weapon, base peak, retention time, totalion chromatography.
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18

Parvole, Julien y Patric Jannasch. "Poly(arylene ether sulfone)s with phosphonic acid and bis(phosphonic acid) on short alkyl side chains for proton-exchange membranes". Journal of Materials Chemistry 18, n.º 45 (2008): 5547. http://dx.doi.org/10.1039/b811755a.

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19

Park, Myung-Ho y Yeong-Jin Chung. "Combustive Properties of Medium Density Fibreboards (MDF) Treated with Bis-(Dimethylaminomethyl) Phosphinic Acid and Alkylenediaminoalkyl-Bis-Phosphonic Acids". Fire Science and Engineering 28, n.º 5 (31 de octubre de 2014): 71–79. http://dx.doi.org/10.7731/kifse.2014.28.5.071.

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20

Otmar, Miroslav, Lucie Poláková, Milena Masojídková y Antonín Holý. "A Facile Synthesis of Azetidin-2-ylphosphonic Acid and Its 1-Alkyl Derivatives". Collection of Czechoslovak Chemical Communications 66, n.º 3 (2001): 507–16. http://dx.doi.org/10.1135/cccc20010507.

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Treatment of racemic diisopropyl [1,3-bis(mesyloxy)propyl]phosphonate with allyl-, benzyl-, 2-hydroxyethyl-, or propylamine gave the corresponding diisopropyl [(3-(alkylamino)-1-(mesyloxy)propyl]phosphonates. Heating of their toluene solution with aqueous potassium carbonate effected a cyclization to diisopropyl (1-alkylazetidin-2-yl)phosphonates. In the 1-benzyl- and [1-(2-hydroxyethyl)azetidin-2-yl]phosphonate, the isopropyl ester groups were removed by treatment with bromotrimethylsilane which gave 1-benzyl- and [1-(2-hydroxyethyl)azetidin-2-yl]phosphonic acid. Following hydrogenolysis of the benzyl group afforded azetidin-2-ylphosphonic acid.
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21

Dvořáková, Hana, Antonín Holý y Petr Alexander. "Synthesis and Biological Effects of 9-(3-Hydroxy-2-phosphonomethoxypropyl) Derivatives of Deazapurine Bases". Collection of Czechoslovak Chemical Communications 58, n.º 6 (1993): 1403–18. http://dx.doi.org/10.1135/cccc19931403.

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Analogs of antiviral 9-(S)-(3-hydroxy-2-phosphonomethoxypropyl)adenine (HPMPA, I), containing modified purine bases 3-deazaadenine XII, 1-deazaadenine XIV, 7-deaz-7-cyanoaadenine XXXII and 3-deazaguanine XXXVIII, were prepared by alkylation of the bases with synthon XVII, containing preformed structure of the side chain, in the presence of cesium carbonate. The obtained protected derivatives were deblocked successively with sodium methoxide and bromotrimethylsilane to give phosphonic acids XII, XIV, XXXII and XXXVIII. Compounds XII, XIV and XVI were also prepared from (S)- or (R)-9-(2,3-dihydroxypropylderivatives VI, VII and XV by the reaction with chloromethanephosphonyl dichloride, isomerization of the arising 2'- and 3'-chloromethanephosphonates and conversion of the 3'-isomers into the phosphonic acids in alkaline medium. The 3-deaza analog XII was also prepared by ditritylation of VI, reaction with bis(2-propyl) tosyloxymethanephosphonate (XXII), subsequent acid hydrolysis and reaction with bromotrimethylsilane. 3-DeazaHPMPA (XII) is a potent inhibitor of DNA viruses (HSV-1, HSV-2, VZV, CMV) and exhibits activity against Plasmodium sp.
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22

Chung, Yeong-Jin. "Combustion Characteristics of Pinus rigida Plates Painted with Alkylenediaminoalkyl-Bis-Phosphonic Acid Derivatives". Journal of Korean Institute of Fire Science and Engineering 27, n.º 5 (31 de octubre de 2013): 57–63. http://dx.doi.org/10.7731/kifse.2013.27.5.57.

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23

Jin, Eui y Yeong-Jin Chung. "Combustion Characteristics of Pinus rigida Plates Painted with Alkylenediaminoalkyl-Bis-Phosphonic Acid (Mn+)". Journal of Korean Institute of Fire Science and Engineering 27, n.º 6 (31 de diciembre de 2013): 70–76. http://dx.doi.org/10.7731/kifse.2013.27.6.070.

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24

Jin, Eui y Yeong-Jin Chung. "Combustion Characteristics of Wood Specimens Treated with Methylenepiperazinomethyl-Bis-Phosphonic Acid (Mn+)s". Fire Science and Engineering 28, n.º 3 (30 de junio de 2014): 55–61. http://dx.doi.org/10.7731/kifse.2014.28.3.055.

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25

Zakharova, L. Ya, S. B. Fedorov, L. A. Kudryavtseva, V. A. Bel'skii, A. B. Mirgorodskaya y B. E. Ivanov. "Hydrolysis of bis(chloromethyl)phosphonic acid p-nitroanilide in aqueous micellar surfactant solutions". Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 39, n.º 8 (agosto de 1990): 1555–59. http://dx.doi.org/10.1007/bf00961476.

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26

Bekker, K. S., N. V. Chukanov y I. A. Grigor’ev. "Synthesis of a bis-Phosphonic Acid Derivative of Trolox, a New Potential Antioxidant". Chemistry of Natural Compounds 49, n.º 4 (septiembre de 2013): 785–86. http://dx.doi.org/10.1007/s10600-013-0746-2.

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27

MIMURA, Mitsuo, Mitsuo HAYASHIDA, Kiyoshi NOMIYAMA, Satoru IKEGAMI, Yasuhito IIDA, Makoto TAMURA, Yoshiyuki HIYAMA y Yoshitaka OHISHI. "Synthesis and Evaluation of (Piperidinomethylene)bis(phosphonic acid) Derivatives as Anti-osteoporosis Agents." CHEMICAL & PHARMACEUTICAL BULLETIN 41, n.º 11 (1993): 1971–86. http://dx.doi.org/10.1248/cpb.41.1971.

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28

Muthukumaran, Kannan, Syeda Huma H. Zaidi, Lianhe Yu, Patchanita Thamyongkit, Matthew E. Calder, Duddu S. Sharada y Jonathan S. Lindsey. "Synthesis of dipyrrin-containing architectures". Journal of Porphyrins and Phthalocyanines 09, n.º 11 (noviembre de 2005): 745–59. http://dx.doi.org/10.1142/s108842460500085x.

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Dipyrrins are valuable precursors to dyes [dipyrrinatoboron difluoride, bis(dipyrrinato)-zinc(II) complexes] and serve as ligands in a variety of self-assembled materials. Six new dipyrrin-containing architectures have been synthesized. The architectures include bis(dipyrrinato) complexes containing copper(II) or palladium(II), a dipyrrin bearing a protected phosphonic acid unit, a porphyrin bearing two dipyrrins in a trans configuration, a linear diphenylethyne-linked dipyrromethane-dipyrrin building block, and a triad composed of two zinc porphyrins joined via an intervening bis(dipyrrinato)copper(II) complex. Two porphodimethenatozinc complexes were prepared and found to have Φ f ≤ 0.002 (in toluene at room temperature), which is substantially less than the analogous bis(dipyrrinato)zinc complexes. Taken together, the syntheses described herein should broaden access to dipyrrins for use as complexation motifs in supramolecular chemistry and as pigments in light-harvesting applications.
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29

Grądzka, Iwona, Mateusz Gierszewski y Marcin Ziółek. "The Effect of Chloride Anions on Charge Transfer in Dye-Sensitized Photoanodes for Water Splitting". Biomimetics 4, n.º 1 (16 de enero de 2019): 5. http://dx.doi.org/10.3390/biomimetics4010005.

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The photoelectrochemical behavior of dye-sensitized photoelectrochemical cells based on a TiO2 layer sensitized with ruthenium components, including an absorber, ruthenium(II)bis(2,2′-bipyridine)([2,2′-bipyridine]-4,4′-diylbis(phosphonic acid)) dibromide (RuP), and a catalyst, ruthenium(II) tris(4-methylpyridine)(4-(4-(2,6-bis((l1-oxidanyl)carbonyl)pyridin-4-yl)phenyl) pyridine-2,6-dicarboxylic acid) (RuOEC), was investigated in the following water-based electrolyte configurations: KCl (pH ≈ 5), HCl (pH ≈ 3), ethylphoshonic acid (pH ≈ 3) with a different KCl concentration, and a standard phosphate buffer (pH ≈ 7). The rate of charge transfer on the photoanode’s surface was found to increase in line with the increase in the concentration of chloride anions (Cl−) in the low pH electrolyte. This effect is discussed in the context of pH influence, ionic strength, and specific interaction, studied by cyclic voltammetry (CV) in dark conditions and upon illumination of the photoanodes. The correlations between photocurrent decay traces and CV studies were also observed.
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30

Koladkar, Devendra y Purshottam Dhadke. "Solvent extraction of Sc(III) from sulfuric acid solution by bis(2-ethylhexyl) phosphonic acid in toluene". Journal of the Serbian Chemical Society 67, n.º 4 (2002): 265–72. http://dx.doi.org/10.2298/jsc0204265k.

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Liquid-liquid extraction of scandium(III) from sulfuric acid solution using bis(2-ethylhexyl) phosphinic acid (PIA-8) in toluene has been studied. The extraction of scandium(III) was found to be quantitative with 0.03 M PIA-8 in toluene in the acidic range of 0.1?0.5 M and 6.0?8.0 M H2SO4. The effect of the reagent concentration and other parameters on the extraction of scandium(III) was also studied. The stoichiometry of the extracted species of scandium(III) was determined on the basis of the slope analysis method. The extraction reaction proceeds via the cation exchange mechanism in the H2SO4 concentration range of 0.1?0.5M and the extracted species is ScR3.3HR. However, at higher acidity (6.0M?8.0M H2SO4) it proceeds by solvation. The extracted species is HSc(SO4)2.4HR. The temperature dependencies of the extraction equilibrium constants were examined to estimate the apparent thermodynamic functions (?H, ?S and ?G) for the extraction reaction.
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31

Park, Myung-Ho y Yeong-Jin Chung. "Combustive Properties of Pinus rigida Plates Painted with Alkylenediaminoalkyl-Bis-Phosphonic Acid Salts (Mn+)". Fire Science and Engineering 28, n.º 6 (31 de diciembre de 2014): 28–34. http://dx.doi.org/10.7731/kifse.2014.28.6.028.

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32

MIMURA, M., M. HAYASHIDA, K. NOMIYAMA, S. IKEGAMI, Y. IIDA, M. TAMURA, Y. HIYAMA y Y. OHISHI. "ChemInform Abstract: Synthesis and Evaluation of (Piperidinomethylene)bis(phosphonic acid) Derivatives as Antiosteoporosis Agents." ChemInform 25, n.º 19 (19 de agosto de 2010): no. http://dx.doi.org/10.1002/chin.199419163.

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33

Sundell, Mats J., Kenneth B. Ekman, Bror L. Svarfvar y Jan H. Näsman. "Preparation of poly[ethylene-g-(vinylbenzyl chloride)] and functionalization with bis(phosphonic acid) derivatives". Reactive Polymers 25, n.º 1 (mayo de 1995): 1–16. http://dx.doi.org/10.1016/0923-1137(95)00002-z.

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34

KELLNER, K. y L. RODEWALD. "ChemInform Abstract: Synthesis of 1-Alkylaminoalkyl Phosphonic Acid Monoesters via Diorganosilyl-bis(O-alkylphosphonates)." ChemInform 22, n.º 52 (22 de agosto de 2010): no. http://dx.doi.org/10.1002/chin.199152248.

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35

Kilian, Petr, Alexandra M. Z. Slawin y J. Derek Woollins. "Novel Condensed Thionated Bis(phosphonic) Acid Salts with a Rigid Naphthalene-1,8-diyl Backbone". European Journal of Inorganic Chemistry 1999, n.º 12 (diciembre de 1999): 2327–33. http://dx.doi.org/10.1002/(sici)1099-0682(199912)1999:12<2327::aid-ejic2327>3.0.co;2-b.

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36

Li, Hui Duan. "Synthesis, Structure and Characterization of a Novel 3D Zinc Organophosphonate". Advanced Materials Research 936 (junio de 2014): 915–18. http://dx.doi.org/10.4028/www.scientific.net/amr.936.915.

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A novel zinc organophosphonate was synthesized under solvothermal conditions by using [piperazine-1,4-diyldi (methylene)] bis (phosphonic acid) as a organic ligand. Single-crystal X-ray diffraction analysis reveals that compound 1 crystallized in the triclinic space group P-1 (No. 2). Compound 1 formulated as Zn (O3PCH2NHC4H8NHCH2PO3)·H2O. Compound 1 featured a 3D open-framework. Notably, the structure of compound 1 featured one-dimensional channel in the [00 direction. Water molecules were located in these channels. Further characterizations of compound 1 have been performed, including X-ray powder diffraction, IR, ICP and CHN analyses.
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37

Kamiya, Naohiro, Atsushi Kubota, Yumiko Iwase, Kouichi Sekiya, Masaru Ubasawa y Satoshi Yuasa. "Antiviral Activities of MCC-478, a Novel and Specific Inhibitor of Hepatitis B Virus". Antimicrobial Agents and Chemotherapy 46, n.º 9 (septiembre de 2002): 2872–77. http://dx.doi.org/10.1128/aac.46.9.2872-2877.2002.

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ABSTRACT MCC-478 is a newly synthesized 2-amino-6-arylthio-9-phosphonomethoxyethylpurine bis(2,2,2-trifluoroethyl) ester derivative. MCC-478 showed a substantially higher (ca. 80-fold) anti-hepatitis B virus (HBV) activity than that of lamivudine, despite no significant anti-human immunodeficiency virus activity. Since the bis(2,2,2-trifluoroethyl) ester group was used to improve the oral bioavailability of the phosphonomethoxyethylpurine derivatives, two monoester derivatives and one phosphonic acid derivative were also evaluated. It was suggested that these hydrolyzed derivatives, which appeared in animals given MCC-478, have enough anti-HBV activity to contribute to efficacy in vivo. Furthermore, no apparent cytotoxic effects or reductions of mitochondrial DNA content by MCC-478 and its derivatives were observed. These results indicated that MCC-478 may be a new promising anti-HBV agent.
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38

Jin, Eui y Yeong-Jin Chung. "Combustive Properties of Medium Density Fibreboard (MDF) Specimens Treated with Alkylenediaminoalkyl-Bis-Phosphonic Acid Derivatives". Fire Science and Engineering 28, n.º 4 (31 de agosto de 2014): 57–63. http://dx.doi.org/10.7731/kifse.2014.28.4.057.

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39

Chung, Yeong-Jin. "Combustive Properties of Specimens Treated with Methylenepiperazinomethyl-Bis-Phosphonic Acid (Mn+)s". Applied Chemistry for Engineering 26, n.º 4 (10 de agosto de 2015): 505–10. http://dx.doi.org/10.14478/ace.2015.1068.

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40

Mahmoudkhani, Amir H., Vratislav Langer y Oliver Lindqvist. "Radical Addition of Bis(Trimethylsilyl)Phosphonate to Vinyltrimethylsilane: Crystal Structure of (2-Trimethylsilylethyl)Phosphonic Acid". Phosphorus, Sulfur, and Silicon and the Related Elements 147, n.º 1 (1 de enero de 1999): 231. http://dx.doi.org/10.1080/10426509908053596.

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41

Bulman Page, Philip C., Michael J. McKenzie y James A. Gallagher. "SIMPLE SYNTHESIS OF OXIRANYLIDENE-2,2-BIS(PHOSPHONIC ACID): TETRABENZYL GEMINAL BISPHOSPHONATE ESTERS AS USEFUL INTERMEDIATES". Synthetic Communications 32, n.º 2 (enero de 2002): 211–18. http://dx.doi.org/10.1081/scc-120002004.

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42

Ran, Qianping, Jianfeng Ma, Tao Wang, Hongxia Zhao, Fengyan Song, Shimin Fan, Yong Yang, Zhifeng Lyu y Jiaping Liu. "Synthesis, characterization and dispersion properties of a series of bis(phosphonic acid)amino-terminated polymers". Colloid and Polymer Science 294, n.º 1 (12 de septiembre de 2015): 189–98. http://dx.doi.org/10.1007/s00396-015-3734-1.

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43

Stephens, Alexander J., Frederik J. Malzner, Edwin C. Constable y Catherine E. Housecroft. "The influence of phosphonic acid protonation state on the efficiency of bis(diimine)copper(i) dye-sensitized solar cells". Sustainable Energy & Fuels 2, n.º 4 (2018): 786–94. http://dx.doi.org/10.1039/c7se00586e.

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44

Egorov, Maxim, Sameh Aoun, Marc Padrines, Françoise Redini, Dominique Heymann, Jacques Lebreton y Monique Mathé-Allainmat. "A One-Pot Synthesis of 1-Hydroxy-1,1-bis(phosphonic acid)s Starting from the Corresponding Carboxylic Acids". European Journal of Organic Chemistry 2011, n.º 35 (25 de octubre de 2011): 7148–54. http://dx.doi.org/10.1002/ejoc.201101094.

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45

Risi, Guglielmo, Mariia Becker, Catherine E. Housecroft y Edwin C. Constable. "Are Alkynyl Spacers in Ancillary Ligands in Heteroleptic Bis(diimine)copper(I) Dyes Beneficial for Dye Performance in Dye-Sensitized Solar Cells?" Molecules 25, n.º 7 (27 de marzo de 2020): 1528. http://dx.doi.org/10.3390/molecules25071528.

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The syntheses of 4,4′-bis(4-dimethylaminophenyl)-6,6′-dimethyl-2,2′-bipyridine (1), 4,4′-bis(4-dimethylaminophenylethynyl)-6,6′-dimethyl-2,2′-bipyridine (2), 4,4′-bis(4-diphenylaminophenyl)-6,6′-dimethyl-2,2′-bipyridine (3), and 4,4′-bis(4-diphenylaminophenylethynyl)-6,6′-dimethyl-2,2′-bipyridine (4) are reported along with the preparations and characterisations of their homoleptic copper(I) complexes [CuL2][PF6] (L = 1–4). The solution absorption spectra of the complexes exhibit ligand-centred absorptions in addition to absorptions in the visible region assigned to a combination of intra-ligand and metal-to-ligand charge-transfer. Heteroleptic [Cu(5)(Lancillary)]+ dyes in which 5 is the anchoring ligand ((6,6′-dimethyl-[2,2′-bipyridine]-4,4′-diyl)bis(4,1-phenylene))bis(phosphonic acid) and Lancillary = 1–4 have been assembled on fluorine-doped tin oxide (FTO)-TiO2 electrodes in dye-sensitized solar cells (DSCs). Performance parameters and external quantum efficiency (EQE) spectra of the DSCs (four fully-masked cells for each dye) reveal that the best performing dyes are [Cu(5)(1)]+ and [Cu(5)(3)]+. The alkynyl spacers are not beneficial, leading to a decrease in the short-circuit current density (JSC), confirmed by lower values of EQEmax. Addition of a co-absorbent (n-decylphosphonic acid) to [Cu(5)(1)]+ lead to no significant enhancement of performance for DSCs sensitized with [Cu(5)(1)]+. Electrochemical impedance spectroscopy (EIS) has been used to investigate the interfaces in DSCs; the analysis shows that more favourable electron injection into TiO2 is observed for sensitizers without the alkynyl spacer and confirms higher JSC values for [Cu(5)(1)]+.
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46

Sun, Wen-Quan y Nina L. Bassuk. "Silver Thiosulfate Application Influences Rooting and Budbreak of `Royalty' Rose Cuttings". HortScience 26, n.º 10 (octubre de 1991): 1288–90. http://dx.doi.org/10.21273/hortsci.26.10.1288.

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The effects of silver thiosulfate (STS) on stored and freshly made cuttings of `Royalty' rose (Rosa hybrids) were examined in relation to rooting and subsequent budbreak. STS pretreatment at 0.5 mm during storage stimulated budbreak but decreased the percentage of cuttings that rooted and the number of roots. IBA at 4.9 to 9.8 mm inhibited budbreak but this effect was partially reversed by STS. Spraying the cuttings with 1.0 mm STS once daily during the first 5 days of the rooting period also reduced rooting but prevented IBA-induced leaf senescence. Ethephon and spermine, each applied at 0.5 mm before rooting, had no effect on rooting or budbreak. Chemical names used: (2-chloroethyl)-phosphonic acid (ethephon); indole butyric acid (IBA); N,N'-bis(3-aminopropyl) -l,4-buanediamine (spermine).
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47

Nasulewicz-Goldeman, Anna, Waldemar Goldeman, Anna Nikodem, Marcin Nowak, Diana Papiernik, Tomasz M. Goszczyński y Joanna Wietrzyk. "Aromatic Bis[aminomethylidenebis(phosphonic)] Acids Prevent Ovariectomy-Induced Bone Loss and Suppress Osteoclastogenesis in Mice". International Journal of Molecular Sciences 22, n.º 17 (3 de septiembre de 2021): 9590. http://dx.doi.org/10.3390/ijms22179590.

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Osteoporosis is a skeletal disease associated with excessive bone turnover. Among the compounds with antiresorptive activity, nitrogen-containing bisphosphonates play the most important role in antiosteoporotic treatment. In previous studies, we obtained two aminomethylidenebisphosphonates—benzene-1,4-bis[aminomethylidene(bisphosphonic)] (WG12399C) acid and naphthalene-1,5-bis[aminomethylidene(bisphosphonic)] (WG12592A) acid—which showed a significant antiproliferative activity toward J774E macrophages, a model of osteoclast precursors. The aim of these studies was to evaluate the antiresorptive activity of these aminobisphosphonates in ovariectomized (OVX) Balb/c mice. The influence of WG12399C and WG12592A administration on bone microstructure and bone strength was studied. Intravenous injections of WG12399C and WG12592A bisphosphonates remarkably prevented OVX-induced bone loss; for example, they sustained bone mineral density at control levels and restored other bone parameters such as trabecular separation. This was accompanied by a remarkable reduction in the number of TRAP-positive cells in bone tissue. However, a significant improvement in the quality of bone structure did not correlate with a parallel increase in bone strength. In ex vivo studies, WG12399C and WG12592A remarkably bisphosphonates reduced osteoclastogenesis and partially inhibited the resorptive activity of mature osteoclasts. Our results show interesting biological activity of two aminobisphosphonates, which may be of interest in the context of antiresorptive therapy.
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48

Vercruysse-Moreira, Karine, Christophe Déjugnat y Guita Etemad-Moghadam. "Efficient synthesis of bolaform- and gemini-type alkyl-bis-[(α-amino)phosphonocarboxylic or phosphonic acid] surfactants". Tetrahedron 58, n.º 28 (julio de 2002): 5651–58. http://dx.doi.org/10.1016/s0040-4020(02)00535-5.

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49

Sundell, Mats J., Esko O. Pajunen, Osmo E. O. Hormi y Jan H. Nasman. "Synthesis and use as a catalyst support of porous polystyrene with bis(phosphonic acid)-functionalized surfaces". Chemistry of Materials 5, n.º 3 (marzo de 1993): 372–76. http://dx.doi.org/10.1021/cm00027a022.

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50

Vendilo, A. G., H. Rönkkömáki, N. N. Kotova, M. Hannu-Kuure, N. E. Kovaleva y L. H. J. Lajunen. "Complexation of strontium with triisopropyl ester of dichloromethylene-bis(phosphonic acid) in water and ionic liquids". Russian Journal of Inorganic Chemistry 55, n.º 10 (octubre de 2010): 1559–62. http://dx.doi.org/10.1134/s0036023610100116.

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