Two Coordination Polymers Created via In Situ Ligand Synthesis Involving C-N and C-C Bond Formation

摘要

We report the synthesis and crystal structures of two transition metal-based coordination polymers comprising ligand molecules not included in the original reaction mixtures but instead formed in situ during hydrothermal treatment.Zinc mesoiminodisuccinate hydrate (I),Zn2(C8H7NO8) centre dot 0.57H2O,formed from zinc acetate and L-aspartic acid,and tetraaquanickel(II) 5,10-dioxo-5,10-dihydro-4,9-dioxa-pyrene-2,7-dicarboxylate (II),Ni(H2O)4(C16H4O8),formed from nickel acetate and 5-hydroxyisophthalic acid.We show that the formation of I takes place via a fumaric acid intermediate,while the formation of II requires the formation of a new C-C bond.The structure of I consists of weakly interacting sheets,while the structure of II consists of strongly hydrogen-bonded chains.Crystal data:for I,P2_1 (14),a = 10.073 A,b = 9.894 A,c = 12.053 A,beta = 105.605°,V= 1156.87(13) A3,Z= 4;for II,P1 (2),a = 5.011 A,b = 6.526 A,c = 12.305 A,a = 76.868°,beta = 84.988°,y = 87.619°,V = 390.3(4) A3,