Complexation Zn2+ and Co2+/3+ with primary diamines: Synthesis, structure and thermal properties

New types of polyfunctional molecules formed by Co2+/3+ and Zn2+ ions with various diamines - biogenic 1,4-diaminobutane (dab, putrescine) and 1,1'-binaphthyl-2,2'-diamine (dabn) - have been obtained. The structure of the compounds was determined by single crystal X-ray diffraction analysis. Dab in the binuclear complex [Zn-2(piv)(2)(dab)(2)(Hdab)(2)]center dot 4piv center dot 2H(2)O (1) plays the role of a bridging ligand. The H-binding in 1 promotes the formation of a supramolecular layer which, according to STA data, predetermines the thermal stability up to 100 degrees C. In the mononuclear complex of cobalt(III), [Co-III(piv)(2)(dab)(2)]Cl-+(-) (2), dab is chelated with the metal center. Replacement of dab with dabn leads to solely chelate coordination in complexes of cobalt(II), [Co-3(OH)(piv)(5)(dabn)(2)]center dot 0.5MeCN (3), and zinc, [Zn(dabn)(2)(NO3)(MeCN)]center dot 2NO(3)center dot 0.5MeCN (4). (C) 2020 Elsevier Ltd. All rights reserved.