I have synthesized Ru(II)thiosemicarbazone complexes with two different coordination modes. The H substituted thiosemicarbazone ligands gave Ru(II) hydride complexes NS donor having pseudo octahedral environment . But In the case of Phenyl substituent ligands results Cyclometallated Ru(II) thiosemicarbazone complexes with CNS coordination mode resulting octahedral geometry.
Both of the complexes has been synthesized in the same experimental conditions. What is the mechanism behind these two unusual coordination modes of thiosemicarbazone ligands? Kindly related to literature reports
Ortho-metallation of arylphospines and arylarsines is a common reaction for many of the platinum group metals. The coordination of P or As places the ortho C-H bond in close proximity for a C-H addition reaction to occur. Here is an early paper on the subject: http://pubs.acs.org/doi/abs/10.1021/ja00452a018
Check these out:
https://www.researchgate.net/post/What_is_the_reason_behind_cyclometalation_of_rutheniumII_complexes_having_triphenyl_arsine
http://pubs.acs.org/doi/pdf/10.1021/ic000915e
http://pubs.rsc.org/en/Content/ArticleLanding/2012/RA/c2ra20105d#!divAbstract
Thanks you Dr. Joseph S Merola sir for your valuable suggestions.
An interesting review article is as follows
A. D. Ryabov Chem. Rev. 1990, 90, 403-424
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