1,1-azido bridge driven aggregation of a trinuclear linear CoIIICoIICoIII centrosymmetric complex

Reactions of Co(OAC)(2) center dot 4H(2)O with NaQ (sodium salt of 8-quinolinol) in methanol in absence and presence of NaN3 give the mononuclear complex iner-COQ(3) center dot MeOH (1) and a linear trinuclear mixed valence complex [CO3(N-3)(4)Q(4)(OH2)(2)] (2). Presence of N-3(-) ions prevents the formation of tris chelate leading to an aggregation to 2. Four N-3 anions bridges three cobalt ions all in mu-1,1 coordination mode, resulting in a trinuclear structure with a center of inversion. The complex contains a high-spin Co-II and two terminal low-spin Co-III. (c) 2007 Elsevier B.V. All rights reserved.