Hydridothiazole Rhodium Complexes as a Result of C-H Bond Activation in Iminothiazoles Chelating Ligands



Jehan Al-hamidi1, Abdulhamid Alsaygh2, Ibrahim Al-Najjar2, *
1 Chemistry Department, College of Science, Princess Nora Bent Abdullrahman University, Riyadh, Saudi Arabia
2 Petrochemicals Research Institute, King Abdulaziz City for Science and Technology, P. O. Box 6086, Riyadh – 11442,Saudi Arabia


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© Al-hamidi et al; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Petrochemicals ResearchInstitute, King Abdulaziz City for Science and Technology, P. O. Box 6086, Riyadh – 11442, Saudi Arabia; Tel: +966 504269199; E-mail; alnajjar@kacst.edu.sa


Abstract

A series of 20 Schiff base ligands derived from 2-aminothiazole and its derivatives and aryl aldehydes with either [RhCl(PPh3)3] or [Rh(µ-Cl)(COD)]2 in the presence of 4 equivalents of PPh3 lead to an Rh(III) cyclometallated complex and the imine ligand (C-H) bond has been added to the metal (C-M-H). The complexes were investigated by using I.R., 1H, 13C and 31P NMR Spectroscopic techniques. The signal of the (C-H) ligand was observed as trans to the nitrogen atom in the complex which is a donor ligand.

Graphical Abstract:

Total synthesis of hydridothiazole rhodium complexes possessing rhodium hydride signal at δ (-14.60 to-15.04) ppm, trans to N-donor ligand and iminoyl carbon (7C=N) signal in Rh (III) observed at δ (220.1-237.6)ppm, lower field and suggestive of carbine like properties.

Keywords:: Hydrido complexes, ligand substitution, IR,1H,13C,31P NMR, oxidative-addition, phosphine complexes, rhodium, Schiff-bases.