A series of coordination polymers based on a new 2′,5′-dimethyl-1,1′:4′,1′′-terphenyl-3,3′′-dicarboxylic acid ligand: structures, luminescence, and magnetic properties

Abstract

Five new coordination polymers, namely, [Mn(L)(BIP)₂]·H₂O (1), [Cd(L)(BIBP)]·1/2DMF·3/2H₂O (2), [Cd₃(L)₃(phen)₂] (3), [Mn₃(L)₃(phen)₂]_n (4), and [Mn₂(L)₂(DMF)·(H₂O)]·DMF (5) (H₂L = 2′,5′-dimethyl-1,1′:4′, 1′′-terphenyl-3,3′′-dicarboxylic acid, BIP = 4,4′-bis(imidazol-1-yl)phenyl, BIBP = 4,4′-bis(imidazol-1-yl)biphenyl, phen = 1,10-phenanthroline and DMF = N,N-dimethylformamide), have been synthesized under solvothermal conditions. Complexes 1 and 2 display similar 3-fold interpenetrating 3D frameworks with {4¹²·6³} pcu topology, but they both possess different structures. Complexes 3 and 4 show non-interpenetrating 3D networks with pcu topology constructed by L²⁻ ligands and phen ligands. Complex 5 is a non-interpenetrating 3D framework based on infinite rod-shaped SBUs. Obviously, with the increase of the steric hindrance or the use of rigid rod-shaped SBUs, complexes 3–5 have efficiently avoided interpenetration. All the complexes are characterized using single-crystal X-ray diffraction analyses, powder X-ray diffraction (PXRD), IR spectra, and elemental analyses. Moreover, thermal stabilities for 1–5 and photoluminescence properties of 2 and 3 have been investigated. The antiferromagnetic properties of 1, 4, and 5 have also been studied.