Two 3D Coordination Frameworks Based on Benzobisimidazole Linkers Generated under Similar Conditions: Synthesis, Structures and Thermal Properties

• Published in: European journal of inorganic chemistry Vol. 2014; no. 31; pp. 5362 - 5369
• Main Authors: Biswas, Shyam, Liu, Ying-Ya, Tonigold, Markus, Weil, Matthias, Volkmer, Dirk
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.11.2014; WILEY‐VCH Verlag; Wiley Subscription Services, Inc
• Subjects: Cobalt; Crystal structure; Diamonds; Dimethyl sulfoxide; Graph theory; Infrared spectroscopy; Ligands; N li­gands; Polymers; Synthesis; Thermal properties; X rays; Zeolites; Zinc
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.201402552

Herein, we present two benzobisimidazole‐based 3D open coordination framework structures. Single‐crystal X‐ray analyses reveal that the title compounds [Zn(H2‐BBIM)(SO4)]·DMSO (1) (H2‐BBIM = benzobisimidazole; DMSO = dimethyl sulfoxide) and [Co(H2‐BBIM)(SO4)(DMSO)0.5] (2) possess two different framework structures, although both of them have been synthesized under similar conditions. Compounds 1 and 2 exhibit cubic diamondoid and tetragonal CrB4 topological nets, respectively, in which the four‐connected tetrahedral {MN2O2} (MII = Zn, Co) coordination units are located at the vertices and the edges are occupied by H2‐BBIM ligands and sulfate anions. Only tetracoordination is observed in 1, whereas both tetra‐ and pentacoordination is present in 2. The phase purity of the compounds was ascertained by X‐ray powder diffraction (XRPD) analysis, infrared spectroscopy, and elemental analysis. Variable‐temperature XRPD analysis indicated that 1 and 2 are stable up to 90 and 140 °C, respectively. The syntheses, crystal structures, and thermal and spectroscopic properties of two benzobisimidazole‐based CoII and ZnII coordination polymers are presented.