Two novel isomeric complexes supported by vanadates {V4O12}: [{Cu(dpa)2}2V4O12] (dpa = 2,2′-dipyridylamine)

Abstract Two Cu(II) complexes supported by tetravanadates, [{Cu(dpa) 2 } 2 V 4 O 12 ] ( 1 and 2 ), have been synthesized under hydrothermal reactions. Structural analysis indicates that complexes 1 and 2 are isomeric and consist of a cyclic [ V 4 O 12 ] 4 - anion bridged to two [ Cu ( dpa ) 2 ] 2 + moieties. Close inspection of complexes 1 and 2 reveals that the [ V 4 O 12 ] 4 - anions adopt chair-like and boat-like configurations respectively, and are coordinated to each Cu(II) ions through a single terminal oxygen atom of two cross vanadium sites. Moreover, Complexes 1 and 2 exhibit trans - and cis -configurations, respectively.