Spontaneous resolution of a homochiral helix built from a tetra-nuclear nickel cluster

Abstract

A chirally helical coordination polymer,5-dicarboxylic acid) constructed from a Ni 4 L 4 building block exhibits spontaneous chiral resolution and the enantiomers of 1M and 1P have been confirmed by singlecrystal analysis and solid-state circular dichroism spectra. The magnetic properties of compound 1 are also discussed.

A new 3-D Cd(II) coordination polymer with metallacalix[4]arene building blocks based on 2-(pyridin-2-yl)-1H-imidazole-4,5-dicarboxylic acid

“…Four kinds of metallacalix [4]arene building blocks M 4 (HPIDC) 4 (M=Ni, Cd and Co) have been reported by Li, Zheng, and our group [20,21] (figure 2). In 1, four cadmium ions are connected by four HPIDC 2− ligands into a metallacalix [4]arene building block Cd 4 (HPIDC) 4 with CdÁ Á ÁCdÁ Á ÁCd angles of 73.43°and 99.17°and CdÁ Á ÁCd distances along the edges being 6.54 and 8.35 Å (figures 2(a) and S2).…”

“…Multiple coordination points endow it with multiform coordination modes. Although several coordination polymers based on H 3 PIDC have been studied by our group and others [17][18][19][20][21][22], more research needs to be done to explore new compounds with H 3 PIDC. The coordination chemistry and crystal engineering of Cd(II) have attracted attention from chemists owing to the attractive structural diversities and potential applications of photoluminescent and nonlinear optical properties [23][24][25][26][27][28][29].…”

A homochiral Cu(i) coordination polymer based on achiral precursors and its photocatalytic properties

“…The most common one is the use of a chiral component as a starting point to construct homochiral frameworks. [17][18][19] Other factors might also affect the chirality of the compound. [7][8][9][10] The second and third methods are all based on the asymmetric crystallization of achiral building blocks.…”

Zwitterionic 4-carboxy-2-(pyridinium-2-yl)-1H-imidazole-5-carboxylate

“…At the same time, their coordination chemistry has become an expanding field of study because of the potential applications in crystal engineering (Zheng et al, 2012;Li et al, 2010Li et al, , 2013. Because of its structural features, the title compound may be a suitable bridging ligand for the construction of coordination polymers with interesting architectures.…”

“…The title compound was prepared by the literature method (Elagab & Alt, 2016;Zheng et al, 2012). o-Phenylenediamine (0.05 mol) was mixed with picolinic acid (0.05 mol) and the mixture was poured into 50 ml of preheated (373 K) polyphosphoric acid.…”