Cd(II)-ethylenediamine mono- and bimetallic complexes - Synthesis and characterization by Cd NMR spectroscopy and single crystal X-ray diffraction |
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Authors: | Guibin Ma Andreas Fischer Kannan Ramaswamy |
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Institution: | a Department of Chemistry, Washington University, One Brookings Drive, Box 1134, St. Louis, MO 63130, USA b Chemistry Department, Royal Institute of Technology (KTH), Stockholm, S-100 44, Sweden |
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Abstract: | Formation of three Cd(II)-ethylenediamine (en) complexes (Cd(en)n]2+, n = 1-3) in aqueous solution and in DMSO solvent has been established by means of 113Cd NMR spectroscopy. It is clearly shown that Cd(II)-en complexes form primarily in basic solutions. A correlation between the 113Cd NMR chemical shifts and the ethylenediamine (en) coordination number has been observed and discussed. Two single crystals with the composition Cd2(en)5](ClO4)4 (1) and Cd(en)3](ClO4)2 (2) were prepared from aqueous solution, and their structures were determined by single crystal X-ray diffraction. Cd(II) ions are coordinated by six atoms in both compounds, 1 and 2: via five N-donor atoms and one O-donor atom forming a bimetallic complex 1, and via six N-donor atoms forming a distorted octahedral monometallic complex 2. Raman spectra of complexes 1 and 2 also provide additional evidence that the cis-form of the bridging en is present in complex 1. |
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Keywords: | Cadmium Ethylenediamine complexes 113Cd NMR Crystal structure Raman spectra |
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