Vibrational frequencies and structural determinations of 3,5-dibromo-1,2,4-trithia-3,5-diborolane |
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Authors: | Jensen James O |
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Affiliation: | US Army Edgewood Chemical and Biological Center, AMSSB-RRT-DP, Aberdeen Proving Ground, MD 21010-5424, USA. james.jensen@sbccom.apgea.army.mil |
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Abstract: | The vibrational frequencies and corresponding normal mode assignments of 3,5-dibromo-1,2,4-trithia-3,5-diborolane (B2S3Br2) are examined theoretically using the Gaussian98 set of quantum chemistry codes. All normal modes were successfully assigned to one of six types of motion predicted by a group theoretical analysis (B-S stretch, B-Br stretch, S-S stretch, S-B-S bend, B-Br wag, B(SSBr) umbrella motion) utilizing the C2v symmetry of the molecule. The vibrational modes of the naturally isotopically substituted (1-10B and 2-10B) forms of B2S3Br2 were also calculated and compared against experimental data. The molecular orbitals of B2S3Br2 are examined. The calculations suggest that a considerable amount of pi bonding occurs in B2S2Br2. |
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