Journal ArticleDOI
Chiral resolution of l- and d-alanine and a racemic macrocyclic nickel(II) complex: synthesis and crystal structures
Reads0
Chats0
TLDR
In this paper, the reaction of a racemic four-coordinate Ni(II) complex [Ni(rac-L)](ClO4)2 with l- and d-alanine in acetonitrile/water gave two sixcoordinate enantiomers formulated as Ni(RR-L)(l-Ala) and ClO4·2CH3CN, respectively.Abstract:
The reactions of a racemic four-coordinate Ni(II) complex [Ni(rac-L)](ClO4)2 with l- and d-alanine in acetonitrile/water gave two six-coordinate enantiomers formulated as [Ni(RR-L)(l-Ala)](ClO4)·2CH3CN (1) and [Ni(SS-L)(d-Ala)](ClO4) (2) (L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclo-tetradecane, Ala− = alanine anion), respectively. Evaporation from the remaining solutions gave two four-coordinate enantiomers characterized as [Ni(SS-L)](ClO4)2 (S-3) and [Ni(RR-L)](ClO4)2 (R-3), respectively. Single-crystal X-ray diffraction analyses of complexes 1 and 2 revealed that the Ni(II) atom has a distorted octahedral coordination geometry, being coordinated by four nitrogen atoms of L in a folded configuration, plus one carboxylate oxygen atom and one nitrogen atom of l- or d-Ala− in mutually cis-positions. Complexes 1 and 2 are supramolecular stereoisomers, constructed via hydrogen bonding between [Ni(RR-L)(l-Ala)]+ or [Ni(SS-L)(d-Ala)]+ monomers to form 1D hydrogen-bonded zigzag chains. The homochiral natures of complexes 1 and 2 have been confirmed by CD spectroscopy.read more
Citations
More filters
3d molecular fragment descriptors for structure-property modeling
A Solovev,Vitaly P. Solov'ev +1 more
TL;DR: In this article, 3D fragment descriptors have been applied to discriminate between stereoisomers in predictive QSPR modeling of the standard free energy (∆G°) for the 1:1 inclusion complexation of 76 chiral guests with β-cyclodextrin (β-CD) and 40 chiral neighbors with 6-amino-6-deoxy-β-cyclodesyntextrin (am-β -CD) in water at 298 K.
Journal ArticleDOI
3D molecular fragment descriptors for structure–property modeling: predicting the free energies for the complexation between antipodal guests and β -cyclodextrins
TL;DR: In this paper, 3D fragment descriptors have been applied to discriminate between stereoisomers in predictive QSPR modeling of the standard free energy (∆G°) for the 1:1 inclusion complexation of 76 chiral guests with β-cyclodextrin (β-CD) and 40 chiral neighbors with 6-amino-6-deoxy-β-cyclodesyntextrin (am-β -CD) in water at 298 K. The program implements the Singular Value Decomposition for Multiple Linear Regression analysis as machine learning method
Journal ArticleDOI
Three enantiomeric pairs of zinc(II) homochiral coordination compounds based on D-(−)- and L-(+)-4-Hydroxyphenylglycine: Synthesis, structures and luminescent properties
Ya-Jing Shi,Hui-Hua Song +1 more
TL;DR: In this paper, three enantiomeric pairs of novel homochiral coordination compounds (HCCs) with the formula {[Zn(D-hpg)(4,4′-bipy)(H2O)] · (NO3)}n 1-L, {Zn (Lhpg)2(4, 4′-Bipy)
Journal ArticleDOI
Chiral Recognition of Racemic Proline based on Chiral Macrocyclic Nickel(II) Complex: Synthesis and Crystal Structures
Journal ArticleDOI
CO 2 fixation by macrocyclic nickel(II) complexes: synthesis and structures of helical chains constructed via hydrogen bonds involving imidazole
TL;DR: In this article, the macrocyclic nickel(II) complexes can easily take up and fix atmospheric CO2 at room temperature, and the chiral nature of complex 2 has been confirmed by CD spectroscopy.
References
More filters
Journal ArticleDOI
Chiral symmetry breaking by chemically manipulating statistical fluctuation in crystallization
Shu Ting Wu,Yanrong Wu,Qing Qing Kang,Hui Zhang,La-Sheng Long,Zhiping Zheng,Rong-Bin Huang,Lan-Sun Zheng +7 more
TL;DR: Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, State Key Lab Phys Chem Solid Surface, Xiamen 361005, Peoples R China.
Journal ArticleDOI
Recent Advances in Chiral Resolution through Membrane‐Based Approaches
Journal ArticleDOI
Amplification of Enantiomeric Excess in a Proline-Mediated Reaction†
Journal ArticleDOI
855. Transition-metal complexes with aliphatic Schiff bases. Part I. Nickel(II) complexes with N-isopropylidene-ethylenediamine schiff bases
Journal ArticleDOI
Breaking Symmetry: Spontaneous Resolution of a Polyoxometalate
Yu Hou,Xikui Fang,Craig L. Hill +2 more
TL;DR: This hafnium-substituted polyoxometalate (POM), 1, shows that spontaneous chiral resolution, a rare phenomenon, can be operable in POM systems.