Sterically-controlled nuclearity in new copper(II) complexes with di-compartmental ligands: Formation of antiferromagnetically coupled angular trimer and mononuclear inclusion complex
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- 作者：Santarupa Thakurta ; Corrado Rizzoli ; Ray J. Butcher ; Carlos J. Gó ; mez-Garcí ; a ; Eugenio Garribba ; Samiran Mitra
- 关键词：Copper(II) ; Compartmental Schiff bases ; Angular trimer ; Antiferromagnetic ; Inclusion complex
- 刊名：Inorganica Chimica Acta
- 出版年：2010
- 出版时间：20 April 2010
- 年：2010
- 卷：363
- 期：7
- 页码：1395-1403
- 全文大小：892 K
文摘
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.