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    STUDIA CHEMIA - Issue no. 1-2 / 1999  
         
  Article:   SPECTROSCOPIC CHARACTERIZATION OF SOME CHROMIUM O-ALKYLDITHIOCARBONATES.

Authors:  RADU FLORIN SEMENIUC, RODICA MICU-SEMENIUC, IONEL HAIDUC, ONUC COZAR.
 
       
         
  Abstract:  Four chromium O-alkylditiocarbonates, with the general formula Cr(S2COR)3, where R = methyl, ethyl, i-propyl and metoxiethyl, were prepared and characterized by elemental analysis, IR and UV-VIS spectra. All the compounds show a reduced thermal stability and decomposition was observed on heating. The CrS6 cromophores exhibit a distorted octahedral geometries. The transition 4T1g(P)<---4A2g(F) was not solved, the calculated value lies in the range 33.600 - 33.930 cm-1. The nephelauxetic parameter, with values from 0.428 to 0.445 suggests, as expected, a high degree of covalency. The same conclusion results from EPR spectra. The IR spectra showed strong absorption bands at 1260-1230 cm-1 (OC), which certified an important contribution of resonance form -2S2CO+-R to the resonance hybrid. On the basis of these values a high degree of covalency was estimated (0,74 - 0,86), also.  
         
     
         
         
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