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- W2014525963 abstract "A student exercise employing semiempirical molecular orbital calculations in the area of organometallic chemistry is presented. PM3 level calculations are applied to the ground-state structures of C6H6)Cr(CO)3 and (B3N3H6)Cr(CO)3. The calculations are generally successful in computing the known features of the ground-state structures. Comparison of the geometries computed for free and complexed C6H6 and B3N3H6 allow discussion of the reasons for the changes observed. The structures of the transition states for rotation of the rings with respect to Cr(CO)3 are also computed. These results permit calculation of the activation energies for the ring rotations. The activation energies computed at the PM3 level are 0.4 and 18.3 kcal/mol for (C6H6)Cr(CO)3 and (B3N3H6)Cr(CO)3, respectively. These results highlight the differences between the two molecules. Students are encouraged to comment on structural changes in the rings, on the phenomenon of ring rotation in these systems and others such as ferrocene, on the question of the aromaticity of the borazine ring, and on the effect of π back-bonding on the positions of the carbonyl stretching bands in the both complexes." @default.
- W2014525963 created "2016-06-24" @default.
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- W2014525963 date "2001-01-01" @default.
- W2014525963 modified "2023-09-26" @default.
- W2014525963 title "Organometallic Computational Exercise: Semiempirical Molecular Orbital Calculations on (C6H6)Cr(CO)3 and (B3N3H6)Cr(CO)3" @default.
- W2014525963 doi "https://doi.org/10.1021/ed078p134" @default.
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