BOND-STRETCH ISOMERS OF TRANSITION-METAL COMPLEXES - DO THEY EXIST
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The existence of bond-stretch isomers of transition-metal complexes and the electronic mechanisms explaining these isomers are investigated with ab initio calculations. For (LWOCl2)+ (L = N, N, N-trimethyl-1, 4, 7-triazacyclononane) complexes, only the 2A state can be identified as a ground state. 2A is an excited state, and the orbital crossing mechanism cannot explain the occurrence of two stable isomers. For cis-mer-MoOCl2(PR3)3 complexes, the second-order Jahn-Teller effect is too weak to cause the bond-stretch phenomenon. On both molecular systems, our calculations support the structure of the blue isomer as the stable compound and preclude the existence of any other isomer with a long M-O bond and similar energy. 1991, American Chemical Society. All rights reserved.