Thakurta, Santarupa and Rizzoli, Corrado and Butcher, Raymond J. and Gómez-García, Carlos J. and Garribba, Eugenio and Mitra, Samiran (2010) Sterically-controlled nuclearity in new copper(II) complexes with di-compartmental ligands: formation of antiferromagnetically coupled angular trimer and mononuclear inclusion complex. Inorganica Chimica Acta, Vol. 363 (7), p. 1395-1403. ISSN 0020-1693. Article.
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Two new copper(II) complexes, [Cu3(L1)2(H2O)2](ClO4)2 (1) and [CuL2 (H2O)] (2) have been derived from two di-compartmental Schiff base ligands H2L1 and H2L2, respectively. Depending on slight modification of the substituent group of the potentially N2O4 donor ligands, tri- and mononuclear structures are obtained, which have been confirmed by single-crystal X-ray diffraction studies. Both complexes have been characterized by elemental analysis, IR, UV–vis and EPR spectroscopy. Complex 1 consists of an angular trinuclear array of copper ions, while complex 2 consists of a mononuclear copper center. Variable temperature magnetic susceptibility measurements have been performed to investigate the magnetic behaviour of complex 1 and the result indicates a strong antiferromagnetic exchange interaction (J = −120.1(2) cm−1) between the adjacent copper(II) centers through two double μ2-phenoxo bridges. Complex 2 is a mononuclear inclusion compound encapsulating one water molecule in the vacant external compartment of the ligand through hydrogen-bonding interactions.
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