Synthesis and Structure of Zinc(II) and Cobalt(II) Coordination Polymers Involving the Elongated 2',3',5',6' Tetramethylterphenyl-4, 4''-dicarboxylate Ligand

Publication date: Available online 10 February 2020Source: Inorganica Chimica ActaAuthor(s): Vasile Lozan, Gamall Makhloufi, Vadim Druta, Paulina Bourosh, Victor Ch. Kravtsov, Narcisa Marangoci, Christian Heering, Christoph JaniakAbstractThe elongated linker 2',3',5',6'-tetramethylterphenyl-4,4''-dicarboxylic acid (H2L) was employed in the synthesis of zinc(II) and cobalt(II) coordination polymers with single or mixed bridging ligands. Seven compounds, that include the solvate H2L·2DMSO (1·2DMSO), the 1D coordination polymer [Zn(L)(DMF)2]n (2), the two 2D coordination polymers {[Zn(L)(DEF)]2·2DEF}n (3) and {[Co(L)(DEF)]2·2DEF}n (4), and the three mixed ligand 3D coordination polymers {[Zn2(L)2(BIBP)]·2DEF}n (5), {[Co2(L)2(BIBP)]·2DEF}n (6) and {[Zn3(L)3(BIPY)1.5]·4DMF·1.5H2O}n (7), (where DMSO is dimethylsulfoxide, DMF is dimethylformamide, DEF is diethylformamide, BIBP stands for 4,4′-bis(1-imidazolyl)biphenyl, and BIPY for 4,4'-bipyridine) have been synthesized and characterized by IR spectroscopy, thermogravimetry, and single-crystal X-ray diffraction. In 2 the zinc atom adopts a tetrahedral O4 environment due to the monodentate coordination of two DMF molecules and two deprotonated bridging L2- ligands. The latter connect the zinc atoms in a zigzag-like chain. In the coordination polymers 3 to 7 the secondary building unit (SBU) is the paddle-wheel moiety {M2(O2C-)4(N/O)2}. The metal atoms are five coordinated with distorted square pyramidal coordination geometr...
Source: Inorganica Chimica Acta - Category: Chemistry Source Type: research