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  • 1 Southwest University of Science and Technology College of Materials Science and Engineering Mianyang P. R. China 621010 Mianyang P. R. China 621010
  • | 2 Yancheng Teacher’s College Department of Chemistry Yancheng P. R. China 224002 Yancheng P. R. China 224002
  • | 3 Nanyang Teacher’s College Department of Chemistry Nanyang P. R. China 473061 Nanyang P. R. China 473061
  • | 4 East China University of Science and Technology Department of Chemistry Shanghai P. R. China 200237 Shanghai P. R. China 200237
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Abstract  

The thiourea complexes of antimony and bismuth triiodide were synthesized by a direct reaction of antimony and bismuth triiodide with thiourea powder at room temperature. The formula of the complex is MI3[SC(NH2)2]3(M=Sb, Bi). The crystal structure of the complexes belongs to monoclinic system and the lattice parameters are a=1.4772 nm, b=1.6582 nm, c=2.0674 nm and β=90.81 for SbI3(SC(NH2)2)3 and a=1.4009 nm, b=2.0170 nm, c=2.0397 nm and β=90.84 for BiI3[SC(NH2)2]3. The infrared spectra reveal that the trivalent antimony or bismuth ion is coordinated by the nitrogen atom, not the sulfur atom of the thiourea. Thermal analysis shows that there are two times structure rearrangements or phase transformation in the complexes from 100 to 170C.