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Journal articles on the topic 'Cyclic RNase A trimer'

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Author: Grafiati

Published: 11 March 2023

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1

Mackay, Lindsey G., Harry L. Anderson, and Jeremy K. M. Sanders. "A platinum-linked cyclic porphyrin trimer." Journal of the Chemical Society, Chemical Communications, no. 1 (1992): 43. http://dx.doi.org/10.1039/c39920000043.

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2

Kanbara, K., K. Nagai, H. Nakashima, N. Yamamoto, R. J. Suhadolnik, and H. Takaku. "The Relationship between Conformation and Biological Activity of 8-substituted Analogues of 2′,5′-Oligoadenylates." Antiviral Chemistry and Chemotherapy 5, no. 1 (February 1994): 1–5. http://dx.doi.org/10.1177/095632029400500101.

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Analogues of the 2′,5′-linked adenylate trimer 5′-monophosphates, p5′A2′p5′A2′p5′A (pA3) (1a), containing 8-hydroxyadenosine and 8-mercaptoadenosine in the first, second, and third nucleotide positions were tested for their ability to bind to and activate RNase L of mouse L cells. The oligomer, p5′ASH2′p5′ASH2′p5′ASH (pASH3) (1c) had little capacity to bind to RNase L. On the other hand, an analogue of the p5′AOH2′p5′AOH2′p5′AOH (pAOH3) (1b) bound almost as well as the parent 2-5A [pppA(2′p5′A)2] (P3A3) (1d) to RNase L. The 8-substituted analogues of 2-5A were more resistant to degradation by (2′,5′) phosphodiesterase. Finally, the monophosphate, pASH3 (1c) which possessed higher anti-HIV activity than pAg (1a) or pAOH3 (1b).

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3

LIBONATI, Massimo, and Giovanni GOTTE. "Oligomerization of bovine ribonuclease A: structural and functional features of its multimers." Biochemical Journal 380, no. 2 (June 1, 2004): 311–27. http://dx.doi.org/10.1042/bj20031922.

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Bovine pancreatic RNase A (ribonuclease A) aggregates to form various types of catalytically active oligomers during lyophilization from aqueous acetic acid solutions. Each oligomeric species is present in at least two conformational isomers. The structures of two dimers and one of the two trimers have been solved, while plausible models have been proposed for the structures of a second trimer and two tetrameric conformers. In this review, these structures, as well as the general conditions for RNase A oligomerization, based on the well known 3D (three-dimensional) domain-swapping mechanism, are described and discussed. Attention is also focused on some functional properties of the RNase A oligomers. Their enzymic activities, particularly their ability to degrade double-stranded RNAs and polyadenylate, are summarized and discussed. The same is true for the remarkable antitumour activity of the oligomers, displayed in vitro and in vivo, in contrast with monomeric RNase A, which lacks these activities. The RNase A multimers also show an aspermatogenic action, but lack any detectable embryotoxicity. The fact that both activity against double-stranded RNA and the antitumour action increase with the size of the oligomer suggests that these activities may share a common structural requirement, such as a high number or density of positive charges present on the RNase A oligomers.

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4

Gabler, Douglas G., and James F. Haw. "Hydrolysis chemistry of the chlorophosphazene cyclic trimer." Inorganic Chemistry 29, no. 20 (October 1990): 4018–21. http://dx.doi.org/10.1021/ic00345a022.

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5

Jung, Stephanie, Tina von Thülen, Ines Yang, Viktoria Laukemper, Benjamin Rupf, Harshavardhan Janga, Georgios-Dimitrios Panagiotidis, et al. "A ribosomal RNA fragment with 2′,3′-cyclic phosphate and GTP-binding activity acts as RIG-I ligand." Nucleic Acids Research 48, no. 18 (September 18, 2020): 10397–412. http://dx.doi.org/10.1093/nar/gkaa739.

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Abstract The RNA helicase RIG-I plays a key role in sensing pathogen-derived RNA. Double-stranded RNA structures bearing 5′-tri- or diphosphates are commonly referred to as activating RIG-I ligands. However, endogenous RNA fragments generated during viral infection via RNase L also activate RIG-I. Of note, RNase-digested RNA fragments bear a 5′-hydroxyl group and a 2′,3′-cyclic phosphate. How endogenous RNA fragments activate RIG-I despite the lack of 5′-phosphorylation has not been elucidated. Here we describe an endogenous RIG-I ligand (eRL) that is derived from the internal transcribed spacer 2 region (ITS2) of the 45S ribosomal RNA after partial RNase A digestion in vitro, RNase A protein transfection or RNase L activation. The immunostimulatory property of the eRL is dependent on 2′,3′-cyclic phosphate and its sequence is characterized by a G-quadruplex containing sequence motif mediating guanosine-5′-triphosphate (GTP) binding. In summary, RNase generated self-RNA fragments with 2′,3′-cyclic phosphate function as nucleotide-5′-triphosphate binding aptamers activating RIG-I.

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6

Wakasugi, Takashi, Naka Tonouchi, Tadashi Miyakawa, Makoto Ishizuka, Takashi Yamauchi, Shinichi Itsuno, and Koichi Ito. "Preparation of Chloroacetaldehyde Cyclic Trimer and Its Depolymerization." Chemistry Letters, no. 1 (1992): 171–72. http://dx.doi.org/10.1246/cl.1992.171.

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7

Wakasugi, Takashi, Tadashi Miyakawa, Fukuichi Suzuki, Shinichi Itsuno, and Koichi Ito. "Preparation of Dichloroacetaldehyde Cyclic Trimer and Its Depolymerization." Synthetic Communications 23, no. 9 (May 1993): 1289–94. http://dx.doi.org/10.1080/00397919308011215.

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8

Metselaar, Gerald A., Jeremy K. M. Sanders, and Javier de Mendoza. "A self-assembled aluminium(iii) porphyrin cyclic trimer." Dalton Trans., no. 5 (2008): 588–90. http://dx.doi.org/10.1039/b717017n.

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9

Wakabayashi, Shigeharu, Mitsumi Kuse, Aimi Kida, Seiji Komeda, Kazuyuki Tatsumi, and Yoshikazu Sugihara. "The structure of 3-(diethylborylethynyl)pyridine: a nonplanarly arranged cyclic trimer." Org. Biomol. Chem. 12, no. 29 (2014): 5382–87. http://dx.doi.org/10.1039/c4ob00849a.

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10

Bhattacharya, Rahul, Sibdas Ray, Jayanta Ray, and Ashutosh Ghosh. "Thermally induced oxidative trimerization of benzimidazole by copper(II) chloride in the solid state." Open Chemistry 1, no. 4 (December 1, 2003): 427–40. http://dx.doi.org/10.2478/bf02475226.

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AbstractBenzimidazolium trichlorocuprate(II) undergoes a redox reaction in the solid state at elevated temperature (∼240°C) to produce the cyclic trimer of benzimidazole and cuprous chloride. The trimer has been characterized by IR, NMR, and Mass spectroscopy. It has also been synthesized in lower yield by heating the mixtures of CuCl2 and benzimidazole in different ratios or heating other compounds of CuCl2 and benzimidazole. The absorption, emission, and excitation spectra of the trimer in two different solvents (TFA and DMSO) and a comparison of these results with those of benzimidazole are presented here.

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11

Sathiyashivan, Shankar Deval, Chakka Kiran Kumar, Bhaskaran Shankar, Malaichamy Sathiyendiran, and Dhanraj T. Masram. "Perfect symmetrical cyclic aromatic trimer motif in tripodal molecule." RSC Advances 7, no. 28 (2017): 17297–300. http://dx.doi.org/10.1039/c7ra01682d.

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A family of substituted benzimidazolyl-based tripodal molecules with alkyl substituted spacers was synthesized, showing perfect symmetric cyclic aromatic trimer motifs which remained intact in the solid as well as solution state.

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12

Luo, Yu, Xiaolin Li, Pu Zhou, Wenxuan Wu, Li Zhan, Ting Liu, Fan Yang, Jie Tang, Shanbao Yu, and Hui Li. "A Practical Synthesis of the Cyclic Butylene Terephthalate Trimer." HETEROCYCLES 96, no. 3 (2018): 483. http://dx.doi.org/10.3987/com-17-13864.

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13

Sukarsaatmadja, Petty, Tadamichi Kumabe, Kazuki Ishida, Hidetake Seino, Yasushi Mizobe, and Naoko Yoshie. "Synthesis and characterization of a novel imidazole cyclic trimer." Tetrahedron Letters 50, no. 28 (July 2009): 4135–37. http://dx.doi.org/10.1016/j.tetlet.2009.04.112.

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14

Gil-Ramírez, Guzmán, Steven D. Karlen, Atsuomi Shundo, Kyriakos Porfyrakis, Yasuhiro Ito, G. Andrew D. Briggs, John J. L. Morton, and Harry L. Anderson. "A Cyclic Porphyrin Trimer as a Receptor for Fullerenes." Organic Letters 12, no. 15 (August 6, 2010): 3544–47. http://dx.doi.org/10.1021/ol101393h.

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15

Rezaei, Mojtaba, S. Sheybani-Deloui, N. Moazzen-Ahmadi, K. H. Michaelian, and A. R. W. McKellar. "Communication: Spectroscopic evidence for a planar cyclic CO trimer." Journal of Chemical Physics 138, no. 7 (February 21, 2013): 071102. http://dx.doi.org/10.1063/1.4793220.

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16

Hooker, Jacob, David Hinks, Gerardo Montero, and Magdelena Icherenska. "Enzyme-catalyzed hydrolysis of poly(ethylene terephthalate) cyclic trimer." Journal of Applied Polymer Science 89, no. 9 (June 13, 2003): 2545–52. http://dx.doi.org/10.1002/app.11963.

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17

Jungnickel, J. L., and C. A. Reilly. "The NMR spectrum of the cyclic trimer of glycidaldehyde." Recueil des Travaux Chimiques des Pays-Bas 84, no. 12 (September 2, 2010): 1526–34. http://dx.doi.org/10.1002/recl.19650841202.

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18

Mandziuk, Margaret. "On the tunneling splitting in a cyclic water trimer." Chemical Physics Letters 661 (September 2016): 263–68. http://dx.doi.org/10.1016/j.cplett.2016.08.024.

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19

Slanina, Zdeněk, Filip Uhlík, Shigeru Nagase, Takeshi Akasaka, Xing Lu, and Ludwik Adamowicz. "Cyclic water-trimer encapsulation into D2(22)-C84 fullerene." Chemical Physics Letters 695 (March 2018): 245–48. http://dx.doi.org/10.1016/j.cplett.2018.02.006.

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20

Begley, Timothy H., and Henry C. Hollifield. "Liquid Chromatographic Determination of Residual Reactants and Reaction By-Products in Polyethylene Terephthalate." Journal of AOAC INTERNATIONAL 72, no. 3 (May 1, 1989): 468–70. http://dx.doi.org/10.1093/jaoac/72.3.468.

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Abstract A precipitation procedure and liquid chromatography (LC) were used to measure the residual reactants and reaction by-products in polyethylene terephthalate (PET) polymers and food packages. The polymer is dissolved in l,l,l,3,3,3-hexafluoro-2-propanol/methyIene chloride and then precipitated with acetone. The filtered solution is evaporated almost to dryness, and the concentrate is diluted with dimethylacetamide for LC analysis. Recoveries for terephthalic acid (TA), bis(2-hydroxyethyl) terephthalate (BHET), and the PET cyclic trimer averaged 95,104, and 98%, respectively. The residual levels of TA, BHET, monohydroxy ethylene terephthalic acid, and the PET cyclic trimer were measured in commercial resins and food packages.

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21

Marsili, Stefania, Ailone Tichon, Deepali Kundnani, and Francesca Storici. "Gene Co-Expression Analysis of Human RNASEH2A Reveals Functional Networks Associated with DNA Replication, DNA Damage Response, and Cell Cycle Regulation." Biology 10, no. 3 (March 13, 2021): 221. http://dx.doi.org/10.3390/biology10030221.

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Ribonuclease (RNase) H2 is a key enzyme for the removal of RNA found in DNA-RNA hybrids, playing a fundamental role in biological processes such as DNA replication, telomere maintenance, and DNA damage repair. RNase H2 is a trimer composed of three subunits, RNASEH2A being the catalytic subunit. RNASEH2A expression levels have been shown to be upregulated in transformed and cancer cells. In this study, we used a bioinformatics approach to identify RNASEH2A co-expressed genes in different human tissues to underscore biological processes associated with RNASEH2A expression. Our analysis shows functional networks for RNASEH2A involvement such as DNA replication and DNA damage response and a novel putative functional network of cell cycle regulation. Further bioinformatics investigation showed increased gene expression in different types of actively cycling cells and tissues, particularly in several cancers, supporting a biological role for RNASEH2A but not for the other two subunits of RNase H2 in cell proliferation. Mass spectrometry analysis of RNASEH2A-bound proteins identified players functioning in cell cycle regulation. Additional bioinformatic analysis showed that RNASEH2A correlates with cancer progression and cell cycle related genes in Cancer Cell Line Encyclopedia (CCLE) and The Cancer Genome Atlas (TCGA) Pan Cancer datasets and supported our mass spectrometry findings.

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22

Moioli, Emanuele, Leo Schmid, Peter Wasserscheid, and Hannsjörg Freund. "A new reaction route for the synthesis of 2-methyl-5-ethylpyridine." Reaction Chemistry & Engineering 2, no. 5 (2017): 754–62. http://dx.doi.org/10.1039/c7re00100b.

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23

N’soukpoé-Kossi, C. N., C. Ragi, and H. A. Tajmir-Riahi. "RNase A – tRNA binding alters protein conformation." Biochemistry and Cell Biology 85, no. 3 (June 2007): 311–18. http://dx.doi.org/10.1139/o07-050.

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Bovine pancreatic ribonuclease A (RNase A) catalyzes the cleavage of P-O5′ bonds in RNA on the 3′ side of pyrimidine to form cyclic 2′,5′-phosphates. Even though extensive structural information is available on RNase A complexes with mononucleotides and oligonucleotides, the interaction of RNase A with tRNA has not been fully investigated. We report the complexation of tRNA with RNase A in aqueous solution under physiological conditions, using a constant RNA concentration and various amounts of RNase A. Fourier transform infrared, UV-visible, and circular dichroism spectroscopic methods were used to determine the RNase binding mode, binding constant, sequence preference, and biopolymer secondary structural changes in the RNase–tRNA complexes. Spectroscopic results showed 2 major binding sites for RNase A on tRNA, with an overall binding constant of K = 4.0 × 105 (mol/L)–1. The 2 binding sites were located at the G-C base pairs and the backbone PO2 group. Protein–RNA interaction alters RNase secondary structure, with a major reduction in α helix and β sheets and an increase in the turn and random coil structures, while tRNA remains in the A conformation upon protein interaction. No tRNA digestion was observed upon RNase A complexation.

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24

Doering, William E., Rubén D. Parra, and X. C. Zeng. "Cooperativity effects in cyclic trifluoromethanol trimer: an ab initio study." Journal of Molecular Structure: THEOCHEM 431, no. 1-2 (April 1998): 119–26. http://dx.doi.org/10.1016/s0166-1280(97)00429-6.

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25

Kawakami, Yoshiteru, Marina Fukawa, Akihiko Yanase, Yuya Furukawa, Yasuhiro Nagata, Eitaka Suzuki, Takuya Horikawa, and Yoshio Kabe. "Cyclic trimer of tripodal trisilanol with new hydrogen bonding motif." Journal of Organometallic Chemistry 799-800 (December 2015): 265–72. http://dx.doi.org/10.1016/j.jorganchem.2015.09.041.

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26

Yeung, Alan S., Curtis W. Frank, and Robert E. Singler. "Excimer fluorescence in polyphosphazenes: 1. Cyclic trimer and polymer solutions." Polymer 31, no. 6 (June 1990): 1092–99. http://dx.doi.org/10.1016/0032-3861(90)90257-y.

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27

Anderson, Julie A., Kelly Crager, Lisa Fedoroff, and Gregory S. Tschumper. "Anchoring the potential energy surface of the cyclic water trimer." Journal of Chemical Physics 121, no. 22 (2004): 11023. http://dx.doi.org/10.1063/1.1799931.

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28

Sathiyashivan, Shankar Deval, Bhaskaran Shankar, Palanisamy Rajakannu, Pratap Vishnoi, Dhanraj T. Masram, and Malaichamy Sathiyendiran. "Steric group enforced aromatic cyclic trimer conformer in tripodal molecules." RSC Advances 5, no. 91 (2015): 74705–11. http://dx.doi.org/10.1039/c5ra05151g.

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A family of tripodal molecules (1–6) with/without steric ethyl groups at the central benzene scaffold and with furan/thiophene/pyridyl groups at the 2-position of the benzimidazolyl unit was synthesised.

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29

GABLER, D. G., and J. F. HAW. "ChemInform Abstract: The Hydrolysis Chemistry of the Chlorophosphazene Cyclic Trimer." ChemInform 22, no. 1 (August 23, 2010): no. http://dx.doi.org/10.1002/chin.199101032.

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30

WAKASUGI, T., N. TONOUCHI, T. MIYAKAWA, M. ISHIZUKA, T. YAMAUCHI, S. ITSUNO, and K. ITO. "ChemInform Abstract: Preparation of Chloroacetaldehyde Cyclic Trimer and Its Depolymerization." ChemInform 23, no. 48 (August 21, 2010): no. http://dx.doi.org/10.1002/chin.199248129.

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31

WAKASUGI, T., T. MIYAKAWA, F. SUZUKI, S. ITSUNO, and K. ITO. "ChemInform Abstract: Preparation of Dichloroacetaldehyde Cyclic Trimer and Its Depolymerization." ChemInform 24, no. 47 (August 20, 2010): no. http://dx.doi.org/10.1002/chin.199347200.

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32

Kuzuhara, Daiki, Wataru Furukawa, Naoki Aratani, and Hiroko Yamada. "Cyclic butadiyne-linked porphyrin(2.1.2.1) oligomers." Journal of Porphyrins and Phthalocyanines 24, no. 01n03 (January 2020): 489–97. http://dx.doi.org/10.1142/s1088424619501931.

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Cyclic butadiyne-linked porphyrin(2.1.2.1) oligomers are synthesized from 5,16-diethynylporphyrin(2.1.2.1) by Glaser–Hay coupling. Porphyrin(2.1.2.1) forms a bent structure which gives advantages for making cyclic structure without templating molecules. We isolated cyclic trimer and tetramer and characterized them by MALDI-TOF-MS and [Formula: see text]H NMR spectroscopy, theoretical calculations, UV-vis absorption and fluorescence spectra and cyclic voltammetry. The cyclic structure mainly affects the reduction potentials because of expansion of [Formula: see text]-conjugations through butadiyne-linkages to stabilize their LUMOs.

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33

Kumar, Chakka Kiran, Shankar Deval Sathiyashivan, Dhanraj T. Masram, K. V. Jovan Jose, and Malaichamy Sathiyendiran. "Experimental and theoretical investigation of intramolecular cooperativity in cyclic benzene trimer motif." RSC Advances 9, no. 2 (2019): 753–60. http://dx.doi.org/10.1039/c8ra06647g.

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A family of biaryl/alkylthiophene (R–R) benzimidazolyl-based tripodal molecules with cyclic benzene trimer (CBT) motif was synthesized and studied by NMR spectroscopy and MPW1PW91/6-311+G(d,p) theory.

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34

Fontaine, Benjamin M., Kevin S. Martin, Jennifer M. Garcia-Rodriguez, Claire Jung, Laura Briggs, Jessica E. Southwell, Xin Jia, and Emily E. Weinert. "RNase I regulates Escherichia coli 2′,3′-cyclic nucleotide monophosphate levels and biofilm formation." Biochemical Journal 475, no. 8 (April 30, 2018): 1491–506. http://dx.doi.org/10.1042/bcj20170906.

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Regulation of nucleotide and nucleoside concentrations is critical for faithful DNA replication, transcription, and translation in all organisms, and has been linked to bacterial biofilm formation. Unusual 2′,3′-cyclic nucleotide monophosphates (2′,3′-cNMPs) recently were quantified in mammalian systems, and previous reports have linked these nucleotides to cellular stress and damage in eukaryotes, suggesting an intriguing connection with nucleotide/nucleoside pools and/or cyclic nucleotide signaling. This work reports the first quantification of 2′,3′-cNMPs in Escherichia coli and demonstrates that 2′,3′-cNMP levels in E. coli are generated specifically from RNase I-catalyzed RNA degradation, presumably as part of a previously unidentified nucleotide salvage pathway. Furthermore, RNase I and 2′,3′-cNMP levels are demonstrated to play an important role in controlling biofilm formation. This work identifies a physiological role for cytoplasmic RNase I and constitutes the first progress toward elucidating the biological functions of bacterial 2′,3′-cNMPs.

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35

Yang, Jinrong, and Yi Gao. "A dipole–dipole interaction tuning the photoluminescence of silicon quantum dots in a water vapor environment." Nanoscale 11, no. 4 (2019): 1790–97. http://dx.doi.org/10.1039/c8nr09090d.

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36

Ozog, Stosh, Nina D. Timberlake, Kip Hermann, Olivia Garijo, Kevin G. Haworth, Guoli Shi, Christopher M. Glinkerman, et al. "Resveratrol trimer enhances gene delivery to hematopoietic stem cells by reducing antiviral restriction at endosomes." Blood 134, no. 16 (August 15, 2019): 1298–311. http://dx.doi.org/10.1182/blood.2019000040.

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Key Points The cyclic resveratrol trimer caraphenol A safely enhances lentiviral vector gene delivery to hematopoietic stem and progenitor cells. Caraphenol A decreases interferon-induced transmembrane protein-mediated restriction in an endosomal trafficking-dependent manner.

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37

Parra, Rubén D. "Halogen-Bonded Driven Tetra-Substituted Benzene Dimers and Trimers: Potential Hosts for Metal Ions." Sci 4, no. 1 (February 25, 2022): 9. http://dx.doi.org/10.3390/sci4010009.

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Cyclic dimers and trimers of tetra-substituted benzenes, ((HOOC)2-C6H2-(NHI)2), are selected as convenient model systems for investigating NI…O=C halogen bond strength and cooperativity. The four substituents in benzene are chosen so that two of them act as halogen bond acceptors (COOH) and two act as halogen bond donors (NHI), as shown in the graphical abstract below. The potential for metal ion binding by each of the halogen-bonded aggregates is also investigated using the monoatomic sodium ion, Na+. Density functional theory calculations performed using the wB97XD functional and the DGDZVP basis set confirmed the ability of halogen bonding to drive the formation of the cyclic dimers and trimers of the model system chosen for this study. Evidence of halogen bond cooperativity is seen, for example, in a 9% shortening of each NI…O=C halogen bond distance with a corresponding 53% increase in the respective critical point density value, ρNI…O=C. Cooperativity also results in a 36% increase in the magnitude of the complexation energy per halogen-bond of the trimer relative to that of the dimer. The results of this study confirm the potential for binding a single Na+ ion by either the dimer or the trimer through their respective halogen-bond networks. Binding of two metal ions was shown to be possible by the dimer. Likewise, the trimer was also found to bind three metal ions. Lastly, the overall structure of the halogen-bonded dimer or trimer endured after complexation of the Na+ ions.

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38

Marvaud, Valérie, Anton Vidal-Ferran, Simon J. Webb, and Jeremy K. M. Sanders. "Stereospecific templated synthesis of a triruthenium butadiyne-linked cyclic porphyrin trimer." Journal of the Chemical Society, Dalton Transactions, no. 6 (1997): 985–90. http://dx.doi.org/10.1039/a605847g.

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39

Tschumper, Gregory S., Yukio Yamaguchi, and Henry F. Schaefer III. "A high level theoretical investigation of the cyclic hydrogen fluoride trimer." Journal of Chemical Physics 106, no. 23 (June 15, 1997): 9627–33. http://dx.doi.org/10.1063/1.473861.

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40

Mulholland, Amy R., Clint P. Woodward, and Steven J. Langford. "Fullerene-templated synthesis of a cyclic porphyrin trimer using olefin metathesis." Chem. Commun. 47, no. 5 (2011): 1494–96. http://dx.doi.org/10.1039/c0cc04474a.

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41

MacGillivray, Leonard R., and Jerry L. Atwood. "Molecular Recognition of the Cyclic Water Trimer in the Solid State." Journal of the American Chemical Society 119, no. 10 (March 1997): 2592–93. http://dx.doi.org/10.1021/ja962955g.

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42

Anderson, Harry L., and Jeremy K. M. Sanders. "Synthesis of a cyclic porphyrin trimer with a semi-rigid cavity." Journal of the Chemical Society, Chemical Communications, no. 22 (1989): 1714. http://dx.doi.org/10.1039/c39890001714.

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43

Shekurov, Ruslan, Vasili Miluykov, Olga Kataeva, Artem Tufatullin, and Oleg Sinyashin. "Crystal structure of cyclic tris(ferrocene-1,1′-diyl)." Acta Crystallographica Section E Structure Reports Online 70, no. 9 (August 1, 2014): m318—m319. http://dx.doi.org/10.1107/s1600536814017346.

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The molecular structure of the trinuclear title compound, [Fe3(C10H8)3] {systematic name: tris[μ-(η5:η5)-1,1′-bicyclopentadienyl]triiron(II)}, consists of three ferrocene subunits (each with an eclipsed conformation) that are condensedviaC—C bonds of the fulvalene moieties into a cyclic trimer. The angles between the planes of the cyclopentadienyl (Cp) rings within the three fulvalene moieties are 76.1 (3), 80.9 (3) and 81.7 (3)°. In the crystal, C—H...π interactions between neighbouring molecules lead to the cohesion of the structure.

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44

Pugliano, N., and R. Saykally. "Measurement of quantum tunneling between chiral isomers of the cyclic water trimer." Science 257, no. 5078 (September 25, 1992): 1937–40. http://dx.doi.org/10.1126/science.1411509.

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45

Rochon, F. D., and R. Melanson. "Structure of a cyclic hydroxo-bridged PtII trimer with platinum–silver bonds." Acta Crystallographica Section C Crystal Structure Communications 44, no. 3 (March 15, 1988): 474–77. http://dx.doi.org/10.1107/s0108270187011545.

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46

Elumalai, Palani, Palanisamy Rajakannu, Firasat Hussain, and Malaichamy Sathiyendiran. "Design strategy for arranging an aromatic cyclic trimer into a tripodal molecule." RSC Advances 3, no. 7 (2013): 2171. http://dx.doi.org/10.1039/c2ra22679k.

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47

Kunkely, Horst, and Arnd Vogler. "Excited state properties of aqueous (2′-deoxyadenosinato)-(pentamethylcyclopentadienyl)rhodium(III) cyclic trimer." Inorganica Chimica Acta 338 (October 2002): 265–67. http://dx.doi.org/10.1016/s0020-1693(02)01019-8.

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Coussan, S., N. Bakkas, A. Loutellier, J. P. Perchard, and S. Racine. "Infrared photoisomerization of the methanol cyclic trimer trapped in a nitrogen matrix." Chemical Physics Letters 217, no. 1-2 (January 1994): 123–30. http://dx.doi.org/10.1016/0009-2614(93)e1337-g.

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Zhao, Han, Changbei Ma, Ying Yan, and Mingjian Chen. "A sensitive cyclic signal amplification fluorescence strategy for determination of methyltransferase activity based on graphene oxide and RNase H." Journal of Materials Chemistry B 7, no. 29 (2019): 4520–27. http://dx.doi.org/10.1039/c9tb00743a.

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Xue, Songlin, Daiki Kuzuhara, Naoki Aratani, and Hiroko Yamada. "Vinylene-Bridged Cyclic Dipyrrin and BODIPY Trimers." International Journal of Molecular Sciences 21, no. 21 (October 28, 2020): 8041. http://dx.doi.org/10.3390/ijms21218041.

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Abstract:

Vinylene-bridged cyclic boron–difluoride complex of dipyrrin (BODIPY) trimers were successfully prepared from expanded dimethyl-vinylene bridged hexaphyrin(2.1.2.1.2.1) Me-Hex that has the structure of alternate dipyrrins and vinylene bridges. The hexaphyrin(2.1.2.1.2.1) Me-Hex can coordinate with boron ions to afford five kinds of cyclic BODIPYs given by step-by-step boron complexations. Crystal structures of all cyclic BODIPYs except for 3BF2-Me-Hex(b) formed non-planar structures. The theoretical calculation predicted that mono-/bis-boron cyclic BODIPYs show the intramolecular charge transfer (ICT) characteristics, whereas tri-boron cyclic BODIPYs have no ICT characteristics. Reflecting these electronic properties, tri-boron cyclic BODIPYs exhibit weak fluorescence in the red region, but mono-/bis-boron cyclic BODIPYs exhibit no emission. Vinylene bridged cyclic dipyrrin trimer Me-Hex is the novel porphyrinoid ligand allowed to control the boron coordination under different reaction conditions to form various boron complexes.

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