Syntheses, structures and magnetic properties of three cobalt(II) coordination polymers based on flexible itaconic acid ligands

• Published in: Transition metal chemistry (Weinheim) 2019-01, Vol.44 (1), p.89-97
• Main Authors: Yin, Wei-Dong, Shen, Jia, He, Yu-Ying, Li, Gui-Lian, Li, Yun-Ping, Ju, Feng-Yang, Liu, Guang-Zhen
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Chemistry and Materials Science; Inorganic Chemistry; Organometallic Chemistry; Physical Chemistry
• ISSN: 0340-4285; 1572-901X
• DOI: 10.1007/s11243-018-0272-y

Three Co(II) coordination polymers, namely [Co(ia)(bpe) 0.5 (H 2 O)] n (1), {[Co(ia)(bib)(H 2 O)]·H 2 O} n (2) and {[Co(ia)(btmb)(H 2 O)]·H 2 O} n (3) (H 2 ia = itaconic acid, bpe = 1,2-bi(4-pyridyl)ethene, bib = 1,4-bis(1-imidazoly)benzene, btmb = 4,4′-bis(triazol-1-ylmethyl)biphenyl), were synthesized solvothermally and analyzed by single-crystal X-ray diffraction and elemental analysis. Complex 1 is a three-dimensional metal–organic framework with ins topology type and Schläfli symbol (6 3 )(6 5 ·8). The alternate arrangement of left- and right-hand 2 1 helix metal–carboxylate chains affords an overall achiral structure. Complex 2 consists of a 3D metal–organic framework with ia 2− anions and bib ligands as linkers with (4 2 ·8 4 ) lvt topology. Complex 3 displays a 2D layer structure, with a three-dimensional supramolecular structure produced from the parallel stacking layers by abundant interlayer hydrogen bonds. Complexes 1 and 2 both obey the Curie–Weiss law within a certain temperature range and exhibit antiferromagnetic coupling between the Co(II) centers across the carboxyl groups of the dianionic ia 2− ligands.