期刊
DALTON TRANSACTIONS
卷 41, 期 39, 页码 12200-12212出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2dt31277h
关键词
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资金
- CSIR, Government of India [09/028(0717)/2008-EMR-I]
- British Engineering and Physical Sciences Research Council (EPSRC)
- University of Reading for funds for the X-Calibur system
- CONSOLIDER-Ingenio [CSD2010-0065]
- MICINN of Spain [CTQ2011-27512]
- Direccio General de Recerca, Desenvolupament Tecnologic i Innovacio del Govern Balear (Accions Especials)
- Spanish Government [CTQ2009-07264]
The trans-[Cu2L2Cl2] (1), and cis-[Cu2L2Cl2]center dot H2O (2) isomers of a diphenoxido bridged Cu2O2 core have been synthesized using a tridentate reduced Schiff base ligand 2-[(2-dimethylamino-ethylamino)-methyl]-phenol. The geometry around Cu(II) is intermediate between square pyramid and trigonal bipyramid (Addison parameter, tau = 0.463) in 1 but nearly square pyramidal (tau = 0.049) in 2. The chloride ions are coordinated to Cu(II) and are trans oriented in 1 but cis oriented in 2. Both isomers have been optimized using density functional theory (DFT) calculations and it is found that the trans isomer is 7.2 kcal mol(-1) more favorable than the cis isomer. However, the hydrogen bonding interaction of crystallized water molecule with chloride ions compensates for the energy difference and stabilizes the cis isomer. Both complexes have been converted to a very rare phenoxido-azido bridged trinuclear species, [Cu3L2(mu(1,1)-N-3)(2)(H2O)(2)(ClO4)(2)] (3) which has also been characterized structurally. All the complexes are antiferromagnetically coupled but the magnitude of the coupling constants are significantly different (J = -156.60, -652.31, and -31.54 cm(-1) for 1, 2, and 3 respectively). Density functional theory (DFT) calculations have also been performed to gain further insight into the qualitative theoretical interpretation on the overall magnetic behavior of the complexes.
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