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Letteratura scientifica selezionata sul tema "Complexe homochiral"

Autore: Grafiati

Pubblicato: 21 dicembre 2024

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Articoli di riviste sul tema "Complexe homochiral"

Ma, Ting-Ting, Xiao-Peng Sun, Zi-Shuo Yao e Jun Tao. "Homochiral versus racemic polymorphs of spin-crossover iron(ii) complexes with reversible LIESST effect". Inorganic Chemistry Frontiers 7, n. 5 (2020): 1196–204. http://dx.doi.org/10.1039/c9qi01590f.

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Roithová, Jana. "Diastereoisomeric proton-bound complexes of 1,5-diaza-cis-decalin in the gas phase". Collection of Czechoslovak Chemical Communications 74, n. 2 (2009): 243–54. http://dx.doi.org/10.1135/cccc2008185.

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Abstract (sommario):

Diastereoisomeric proton-bound complexes of 1,5-diaza-cis-decalin (1) with butan-2-amine (2) are studied by means of the DFT calculations and mass spectrometry. The calculations reveal that 2 is bound via proton to only one nitrogen atom of the bicyclic base 1. The homochiral complex is favored by about 4 kJ/mol over the heterochiral complex. For a more loosely bound ion-pair complex [(1H)I(2H)]+ of the protonated bases 1 and 2 with an iodine counterion the energy difference drops to about 2 kJ/mol. Chiral effects in the formation of [(1)H(2)]+ are studied by the collision-induced dissociation of [(1H)I(2H)]+ generated by the electrospray ionization of the solution of [1·Cu(OH)I] and 2 in acetonitrile. The dominant fragmentation of [(1H)I(2H)]+ leads to 1·H+ and 2·HI, which is at small collision energies accompanied by the elimination of HI leading to the desired [(1)H(2)]+ ion. The chiral effect of 1.2 is determined in favor for the formation of the homochiral complex [(1)H(2)]+.

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Liu, Yu-Ling, Jia-Zhen Ge, Zhong-Xia Wang e Ren-Gen Xiong. "Metal–organic ferroelectric complexes: enantiomer directional induction achieved above-room-temperature homochiral molecular ferroelectrics". Inorganic Chemistry Frontiers 7, n. 1 (2020): 128–33. http://dx.doi.org/10.1039/c9qi01197h.

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Howard, Philip W., G. Richard Stephenson e Stephen C. Taylor. "Convenient access to homochiral tricarbonyliron complexes". Journal of the Chemical Society, Chemical Communications, n. 24 (1988): 1603. http://dx.doi.org/10.1039/c39880001603.

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Sapotta, Meike, Peter Spenst, Chantu R. Saha-Möller e Frank Würthner. "Guest-mediated chirality transfer in the host–guest complexes of an atropisomeric perylene bisimide cyclophane host". Organic Chemistry Frontiers 6, n. 7 (2019): 892–99. http://dx.doi.org/10.1039/c9qo00172g.

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Gao, Wan-Qing, Yin-Shan Meng, Chun-Hua Liu, Yao Pan, Tao Liu e Yuan-Yuan Zhu. "Spin crossover and structural phase transition in homochiral and heterochiral Fe[(pybox)2]2+ complexes". Dalton Transactions 48, n. 19 (2019): 6323–27. http://dx.doi.org/10.1039/c8dt04893b.

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Míšek, Jiří, Miloš Tichý, Irena G. Stará, Ivo Starý e Detlef Schröder. "Preferential formation of homochiral silver(I) complexes upon coordination of two aza[6]helicene ligands to Ag+ ions". Collection of Czechoslovak Chemical Communications 74, n. 2 (2009): 323–33. http://dx.doi.org/10.1135/cccc2008184.

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By means of selective deuterium labeling of 1-aza[6]helicene combined with resolution of the enantiomers, chiral discrimination in silver(I)-bound dimers of the type [LAgL′]+ is probed by electrospray mass spectrometry. The analysis of the results reveals a pronounced preference for the formation of homochiral dimers (P,P and M,M, respectively) over the statistically preferred heterochiral variant (P,M), which is fully consistent with previous data about the formation of homochiral dimers in the condensed phase. Further, competitive experiments with mixtures of 1- and 2-aza[6]helicene suggest a largely preferred coordination of 1-aza[6]helicene to the silver(I) cation.

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Kataeva, Olga, Kirill Metlushka, Kamil Ivshin, Zilya Yamaleeva, Ruzal Zinnatullin, Kristina Nikitina, Elena Badeeva et al. "Supramolecular chirality in the crystals of mononuclear and polymeric cobalt(ii) complexes with enantiopure and racemic N-thiophosphorylated thioureas". CrystEngComm 23, n. 10 (2021): 2081–90. http://dx.doi.org/10.1039/d0ce01871f.

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The control of stereochemistry in Co(ii) complexes was provided by additional pyridine and pyrazine ligands. 1D and 2D supramolecular homochiral arrangements in racemic crystals of mononuclear complexes are transferred to their polymeric counterparts.

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Jiao, Luyang, Mengying Du, Yameng Hou, Yuan Ma e Xianglei Kong. "Homochiral or Heterochiral: A Systematic Study of Threonine Clusters Using a FT ICR Mass Spectrometer". Symmetry 14, n. 1 (6 gennaio 2022): 86. http://dx.doi.org/10.3390/sym14010086.

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The strong chiral preferences of some magic clusters of amino acids have attracted continually increasing interests due to their unique structures, properties and possible roles in homochirogenesis. However, how chirality can influence the generation and stability of cluster ions in a wild range of cluster sizes is still unknown for most amino acids. In this study, the preference for threonine clusters to form homochiral and heterochiral complex ions has been investigated by electrospray ionization (ESI) mass spectrometry. Abundant cluster [Thrn+mH]m+ ions (7 ≤ n ≤ 78, 1 ≤ m ≤ 5) have been observed for both samples of enantiopure (100% L) and racemic (50:50 L:D) threonine solutions. Further analyses of the spectra show that the [Thr14+2H]2+ ion is characterized by its most outstanding homochiral preference, and [Thr7+H]+ and [Thr8+H]+ ions also clearly exhibit their homochiral preferences. Although most of the triply charged clusters (20 ≤ n ≤ 36) are characterized by heterochiral preferences, the quadruply charged [Thrn+4H]4+ ions (40 ≤ n ≤ 59) have no obvious chiral preference in general. On the other hand, a weak homochiral preference exists for most of the quintuply charged ions observed in the experiment.

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Fowler, Jonathan M., Flora L. Thorp-Greenwood, Stuart L. Warriner, Charlotte E. Willans e Michaele J. Hardie. "M12L8 metallo-supramolecular cube with cyclotriguaiacylene-type ligand: spontaneous resolution of cube and its constituent host ligand". Chemical Communications 52, n. 56 (2016): 8699–702. http://dx.doi.org/10.1039/c6cc04130b.

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Più fonti

Tesi sul tema "Complexe homochiral"

Dussart, Caitlyn. "Chiral self-recognition study of metallic complexes : towards coordination polymers". Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAE006.

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Les assemblages polymériques métallo-supramoléculaires constituent une nouvelle classe de matériaux apparue au cours des dernières décennies. Ces matériaux présentent un large éventail de propriétés qui dépendent de la nature des métaux et des ligands ditopiques utilisés. La réversibilité des liaisons de coordination offre également un caractère dynamique au système qui peut répondre à un stimulus externe. En introduisant de la chiralité dans ces systèmes moléculaires, nous pouvons étudier la capacité de ces structures moléculaires à s’associer ou à se désolidariser pour former des espèces homochirales ou hétérochirales. Ce manuscrit se concentre sur la synthèse et la chimie de coordination de ligands chiraux avec une symétrie C2, tels que les bisoxazolines, les bisimidazolines et les dérivés du 1,2-diaminocyclohexane. La complexation de deux ligands sur un métal de transition donne formation à des complexes homoleptiques ML2 dans lesquels la chiralité des ligands et la géométrie de coordination sont des paramètres importants pour observer une auto-association ou une hétéro-association des ligands. Tous ces complexes ont été étudiés et caractérisés à l’état solide ou en solution et l’impact des groupements chiraux sur les ligands a également été analysée. Afin de convertir ces complexes en assemblages polymériques, des ligands ditopiques chiraux ont également été conçus, synthétisés et étudiés
Metallo-supramolecular polymeric assemblies are a new class of materials that have emerged in recent decades. These materials exhibit a wide range of properties depending on the nature of the metals and the ditopic ligands used. The reversibility of the coordination bonds also gives the system a dynamic character that can response to an external stimulus. By introducing chirality into these molecular systems, we can study the ability of these molecular structures to associate or disassociate to form homochiral or heterochiral species.This manuscript focuses on the synthesis and coordination chemistry of chiral ligands with C2-symmetry, i.e. bisoxazolines, bisimidazolines and derivates of 1,2-diamonocyclohexane. The complexation of two ligands to a transition metal gives rise to homoleptic ML2 complexes, in which the chirality of the ligands and the coordination geometry are important parameters for observing self-association or hetero-association of the ligands. All these complexes have been studied and characterized in the solid state or in solution and the influence of the chiral groups of the ligands has also been analysed. In order to convert these complexes into polymeric assemblies, chiral ditopic ligands have also been designed, synthesized and studied

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Preston, Simon Christopher. "Asymmetric synthesis via iron acyl complexes". Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236153.

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Buffet, Jean-Charles. "Homochiral metal complexes for biodegradable polymer synthesis". Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4618.

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Chapter One introduces the principle of alkoxide and phosphine oxide as ligands for lanthanides and electropositive metals, ligand self-recognition, stereoselective polymerisation of lactide, fixation of CO2 and finally copolymerisation of CO2 and epoxide. Chapter Two shows the synthesis of the proligands rac-HLR (a racemic phosphine oxide-alkoxide, A, where R = tBu, Ph or C6H3-Me-3,5) and explores the resolution into diastereomeric RRR- and SSS-M(LR)3 to afford C3–symmetric M(LR)3 complexes, B (where M = Sc, Lu, Y, In, Bi or La). It also demonstrates that the process is under thermodynamic control and driven by ligand self-recognition via the synthesis of bis(LR) adducts (LR)2MX, C, (where M = Y or In and X = N(SiMe3)2 or OC6H3-tBu2-2,6) and mono(LR) adducts (LR)MX2, D (where M = Al or In and X = N(SiMe3)2, CH2SiMe3 or Me). Finally, it outlines the fixation of CO2 into an indiumamide bond. Chapter Three contains a detailed investigation of the potential of the MIII complexes as initiators for the stereoselective polymerisation of lactide, - caprolactone, glycolide and copolymerisation of lactide and -caprolactone, lactide and glycolide and CO2 and epoxide. Chapter Four investigates the use of rac-HLtBu in the resolution into diastereomeric RR- and SS-M(LtBu)2 complexes, E (where M = Ca, Zn or Sn), and of rac-HLPh into [M(LR)2]2 complexes, F (where M = Mg, Co or Sn and R = Ph or C6H3-Me-3,5) and mono-(LtBu) adducts (LtBu)MgX, G (X = N(SiMe3)2 or OC6H3-tBu2-2,6). It also describes the synthesis of protonated MII complexes (HLR)MCl2, H (where M = Mg, Zn or Sn and R = tBu or Ph). Finally, it details the polymerisation of lactide and its copolymerisation with glycolide using MII complexes as initiators. Chapter Five gives full experimental details and analytical data for the herein described novel compounds.

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Capitoli di libri sul tema "Complexe homochiral"

Jin, Mingoo. "Luminescent Mechanochromism of a Chiral Complex: Distinct Crystal Structures and Color Changes of Racemic and Homochiral Gold(I) Isocyanide Complexes with a Binaphthyl Moiety". In Novel Luminescent Crystalline Materials of Gold(I) Complexes with Stimuli-Responsive Properties, 83–102. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4063-9_3.

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Beaulieu, Pierre l., e robert dáziel. "Addition of electrophilic organoselenium reagents to carbon-carbon double bonds". In Organoselenium Chemistry, 35–66. Oxford University PressOxford, 1999. http://dx.doi.org/10.1093/oso/9780198501411.003.0003.

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Abstract Since the discovery in the late 1950s that species of the type RSeX add stereospecifically to simple alkenes, electrophilic selenium-based reagents have provided the synthetic chemist with an ever-growing arsenal of methods for the construction of complex organic molecules. Comprehensive reviews of the rich chemistry characteristic of electrophilic selenium species have appeared. In this chapter we have concentrated on the practical aspects of this chemistry, limiting ourselves to the generation and use of novel organoselenium electrophiles. Representative examples are provided of applications to carbon-oxygen, carbon-nitrogen and carbon-carbon bond formation. A final section is devoted to the growing importance of homochiral electrophilic selenium reagents and their application to asymmetric synthesis.

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