Metalloligand-induced Synthesis of Two Cu(I)–M (M=Ni, Co) Heterobimetallic Coordination Polymers: Structures, Thermal and Luminescence Properties

Abstract

Two interesting heterobimetallic coordination polymers (CPs), {[Ni(4-pytpy)2]2[Cu4(N(CN)2)7](NO3)(DMF)(DMSO)(H2O)4}n (1) and {[Co(4-pytpy)(N(CN)2)]2[Cu2(N(CN)2)4]}n (2), have been synthesized based on different metalloligands [M(4-pytpy)2]2+ (M=Ni 1, Co 2) (4-pytpy = 4′-(4-pyridyl)-2,2′:6′,2″-terpyridine). CPs 1 and 2 have been well characterized by elemental analysis, IR spectroscopy, thermal analysis and single-crystal X-ray diffraction. Both CPs 1 and 2 crystallize in the triclinic crystal system with the P-1 space group but feature different structures. CP 1 exhibits a unique one dimensional double-chain structure, while CP 2 possesses an infinite 2D network structure. It is interesting to note that the metalloligand [Co(4-pytpy)2]2+ in CP 2 was decomposed into [Co(4-pytpy)]2+. Thermal analysis indicates that the chain structure of CP 1 begins to collapse after about 360 °C, while CP 2 can be stable up to 300 °C. The solid-state luminescence properties of CPs 1 and 2 have also been investigated.