Complexes derived from the general copper(II)/maleamic acid/N,N′,N′′-chelate reaction systems: Synthetic,reactivity, structural and spectroscopic studies |
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| Authors: | Katerina N Lazarou Catherine P Raptopoulou Spyros P Perlepes Vassilis Psycharis |
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| Institution: | 1. Institute of Materials Science, Patriarxou Grigoriou and Neapoleos, NCSR “Demokritos”, 153 10 Aghia Paraskevi Attikis, Greece;2. Department of Chemistry, University of Patras, 265 04 Patras, Greece |
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| Abstract: | The synthetic investigation of the CuII/maleamate(−1) ion (HL−)/N,N′,N′′-chelate general reaction system has allowed access to compounds Cu2(HL)2(bppy)2](ClO4)2·H2O (1·H2O), Cu(HL)(bppy)(ClO4)] (2) and Cu(HL)(terpy)(H2O)](ClO4) (4) (bppy = 2,6-bis(pyrazol-1-yl)pyridine, terpy = 2,2′;6′,2′′-terpyridine). In the absence of externally added hydroxides, compound Cu2(L′)2(bppy)2](ClO4)2 (3) was obtained from MeOH solutions; L′− is the monomethyl maleate(−1) ligand which is formed in situ via the CuII-assisted HL− → L′− transformation. In the case of tptz-containing (tptz = 2,4,6-tris(2-pyridyl)-1,3,5-triazine) reaction systems, the CuII-assisted hydrolysis of tptz to pyridine-2-carboxamide (L1) afforded complex Cu(L1)2(NO3)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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| Keywords: | Amide methanolysis Copper(II) complexes Maleamate(&minus 1) complexes Monomethyl maleate(&minus 1) ligand tptz Hydrolysis |
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