Chiral Coordination Polymers Containing Helixes: Syntheses, Structures And Properties

Ten new chiral coordination polymers, namely,[Ni（L）（H₂O）₂]（1）,[Co（L）（H₂O）₂]（2）,[Cd（L）（H₂O）]（3）,[Cd（L）（phen）]（4）,[Mn₂（L）₂（phen）₂] H₂O （5）,[Cd₂（L）₂（biim-4）₂]（6）,[Zn₂（L）₂（biim-4）₂]（7）,[Cd（L）（pbib）]（8）,[Cd（L）（bbtz）]（9） and [Cd（L）（biim-6）]（10）, wherephen=1,10-phenathroline, biim-4=1,1′-（1,4-butanediyl）bis（imidazole）, pbib=1,4-bis（imidazole-1-ylmethyl）benzene, bbtz=1,4-bis（1,2,4-triazol-1-ylmethyl）benzene,biim-6=1,1′-（1,6-hexanedidyl）bis（imidazole） and H₂L=（R）-2-（4-（4-carboxybenzyloxy）phenoxy）propanoic acid, have been synthesized undersolvothermal conditions. Their structures have been determined by single-crystal X-raydiffraction analyses. Compounds1and2exhibit similar1D left-handed helical chains, whichare further extended into3D supramolecular structures through hydrogen-bondinginteractions, respectively. Compound3shows a2D double-layer architecture containinghelical chains. Compound4features two types of2D undulated sheets with helical chains,which are stacked in an ABAB fashion along the c direction. Compound5possesses a1Ddouble chain ribbon structure containing unusual helical chains, which is linked by π-πinteractions into a2D supramolecular layer. These layers are further extended byhydrogen-bonding interactions to form a3D supramolecular assembly. Compounds6and7are isostructural and exhibit2D （44）-sql networks with helical chains. Neighboring sheets arefurther linked by hydrogen-bonding interactions to generate3D supramolecular architectures.Compounds8-10are isostructural and display3D3-fold interpenetrating diamondframeworks with helical chains. The effects of coordination modes of L anions, metal ions,and N-donor ligands on the structures of the coordination polymers have been discussed. Theluminescent properties of3,4and6-10have also been investigated in detail.