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Cu(L)(Cl)(L ́)]·H2O 1 (L = 2-aminomethylbenzimidazole, L ́ = L-isoleucinate) compound crystallizes in the orthorhombic space group P212121. A short Cu—O...Cu contact is observed between neighboring molecules in the crystal structure, with a O...Cu separation of 4.214(3) Ǻ. Molecular structure of 1 shows that L and L ́ act as bidentate ligands, forming the base of the square pyramidal geometry environment of the Cu ion, while the chloro is the fifth apical ligand. UV/VIS spectrum of 1 shows d-d transitions with λmax = 603 nm, characteristic of a low symmetry. Far IR spectrum shows νCu-N at 493, 404 cm, νCu-O at 446 cm, and at 302 cm νCuCl. ESR X-band of polycrystalline 1 at 77, 300 K show axial spectra with the ratio A77/A300 = 4.51, and a linewidth increase by 14.5 % on going from 300 K to 77 K, suggesting a incipient ferromagnetic exchange interaction. ESR axial spectrum of 1 in solution shows abundant hfs and shfc interactions. Susceptibility vs Temperature data measured from 2-300 K range, show that the magnetic ordering may be due to Cu ions linking by oxygen bridges given place to a weak ferromagnetic interaction. The very weak exchange interaction, J = 0.103 cm, is in agreement with the ESR spectra results and with a Cu—O...Cu direct interaction. Issue in Honor of Prof Rosalinda Contreras Theurel ARKIVOC 2008 (v) 31-42 ISSN 1424-6376 Page 32 ARKAT USA, Inc.

arkivoc

Crystal structure, spectroscopy and ferromagnetostructural behavior of the complex [CuII(L)(Cl)(L´)]•H2O (L = 2-aminomethylbenzimidazole, L´= L-isoleucinate)