Abstract
The synthetic investigation of the Cu II/maleamate(−1) ion (HL −)/ N, N′, N′′-chelate general reaction system has allowed access to compounds [Cu 2(HL) 2(bppy) 2](ClO 4) 2·H 2O ( 1·H 2O), [Cu(HL)(bppy)(ClO 4)] ( 2) and [Cu(HL)(terpy)(H 2O)](ClO 4) ( 4) (bppy = 2,6-bis(pyrazol-1-yl)pyridine, terpy = 2,2′;6′,2′′-terpyridine). In the absence of externally added hydroxides, compound [Cu 2(L′) 2(bppy) 2](ClO 4) 2 ( 3) was obtained from MeOH solutions; L′ − is the monomethyl maleate(−1) ligand which is formed in situ via the Cu II-assisted HL − → L′ − transformation. In the case of tptz-containing (tptz = 2,4,6-tris(2-pyridyl)-1,3,5-triazine) reaction systems, the Cu II-assisted hydrolysis of tptz to pyridine-2-carboxamide (L1) afforded complex [Cu(L1) 2(NO 3) 2] ( 5). The crystal structures of 1– 5 are stabilized by intermolecular hydrogen bonding and π–π stacking interactions. Characteristic IR bands of the complexes are discussed in terms of the known structures and the coordination modes of the ligands.
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