Syntheses, Structural Evolutions, and Properties of Cd(II) Coordination Polymers Induced by Bis(pyridyl) Ligand with Chelated or Protonated Spacer and Diverse Counteranions

Abstract

Hydrothermal reaction of Cd(II) metal salts, diverse organic acids, as well as flexible bis(pyridyl) ligand leads to the formation of 10 complexes, namely, [Cd2LCl4]n (1), [Cd(H2L)(SO4)2(H2O)2]n·6nH2O (2), [CdL(malonate)]n·5nH2O (3), [Cd2L(malonate)Cl2(H2O)]n·nH2O (4), [Cd2(H2L)(succinate)3]n·4nH2O (5), [Cd2L(fumarate)2(H2O)2]n·2nH2O (6), [Cd2L(m-BDC2–)2]n·2nH2O (7), [Cd2(L)(p-BDC2–)2(H2O)3]n·3nH2O (8), [Cd3(L)2(p-BDC2–)3(H2O)4]n·nH2O (9), and [Cd3(H2L)(p-BDC2–)2(SO4)2(H2O)3]n·2nH2O (10) (L = N,N′-bis(pyridin-3-ylmethyl)ethane-1,2-diamine, m-BDC2– = m-benzene dicarboxylate dianion, p-BDC2– = p-benzene dicarboxylate dianion), which have been characterized by elemental analysis, infrared, thermogravimetric analysis, PL, powder and single-crystal X-ray diffraction. Structural analyses indicate that the diverse coordination modes of the bis(pyridyl) ligand with a chelated or protonated spacer, the feature of different inorganic and organic anions, can effectively influence the topological structures of these ...