Selenourea as a ligand: visible and infrared spectra of some complexes of selenourea with cobalt, zinc, cadmium, and mercury
- 1 January 1972
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 19,p. 2103-2107
- https://doi.org/10.1039/dt9720002103
Abstract
The donor properties of selenourea (su) are in general very similar to those of thiourea. Ligand field parameters derived from the visible spectra of Co(su)4(ClO4)2 and Co(su)4(NO3)2 are 10 Dq= 4040 cm–1, β= 0·61. The i.r. spectrum of co-ordinated selenourea is discussed in terms of the calculated potential energy distribution for the planar vibrations of selenourea. Metal–selenium stretching vibrations lie in the frequency range 245–167 cm–1 decreasing in the order M = Co > Zn > Cd > Hg. The ratio νMSe : νMS in comparable selenourea and thiourea complexes is approximately 0·80. The mercury(II) complex Hg(su)2Br2 probably contains planar [Hg(su)2Br]+ ions, but the structures of Hg(su)2Cl2 and Hg(su)2l2 cannot be determined with any degree of certainty from the i.r. data alone.Keywords
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