Cobalt(II) coordination polymers assembled from polycarboxylate and benzotriazole: Syntheses, structures and physical properties

Hydrothermal reactions of cobalt(II) salt with H2CAM or H2SDBA and HBTA in the presence of NaOH afford two interesting coordination polymers, Co3(CAM)2(BTA)2 (1) and Co3(SDBA)2(BTA)2 (2) (H2CAM = camphoric acid, H2SDBA = 4,4′-dicarboxybiphenyl sulfone, HBTA = benzotriazole), both of which have been structurally characterized by single-crystal X-ray, elemental analysis, infrared spectroscopy, and thermogravimetric analysis. Complexes 1 and 2 are isostructural and possess two-dimensional covalent network, comprising an unusual linear Co(II) chains of mixed Td–Oh–Td geometries. Temperature-dependent magnetic measurements indicate the existence of antiferromagnetic interactions in both 1 and 2.

Graphical abstractTwo new 2D coordination polymers, Co3(CAM)2(BTA)2 (1) and Co3(SDBA)2(BTA)2 (2) (H2CAM = camphoric acid, H2SDBA = 4,4′-dicarboxybiphenyl sulfone, HBTA = benzotriazole) contained unusual linear Co(II) trimers of mixed Td–Oh–Td geometries and exhibit weak antiferromagnetic exchange interactions between the adjacent Co(II) centers.Figure optionsDownload full-size imageDownload as PowerPoint slide