Coinage metal complexes of amido ligand with two pendent carbenes or fluorinated 1,3,5-triazapentadienes

Coinage metal complexes of pincer ligands are important in wide range of applications such as homogeneous catalysis, and in material sciences. However, there are few structurally characterized monoanionic tridentate copper(I) and silver(I) complexes. Therefore, new series of monoanionic CNC pincer ligands based on N-heterocyclic carbenes (NHC) and amido groups were developed.;The pincer salts were deprotonated to form the corresponding lithium amido complexes. This highly reactive lithium amido complex containing the bulky groups on the nitrogen atom of NHC moiety was isolated and have shown interesting bonding features. The successful transmetallation to the copper(I), silver(I) complexes were accomplished by treating these lithium salts with corresponding copper(I) triflate or silver(I) triflate. Structural and spectroscopic investigations of copper(I) and silver(I) pincer complexes indicate the differences in coordination modes due to steric properties of the pincer ligands, and due to differences in ionic sizes of Cu(I) and Ag(I) metal ions.;Our interest in coinage metal complexes of fluorinated 1,3,5-triazapentadienyl ligands are due to their interesting structural bonding features, and in applications such as catalysis, and as antibacterial agents. New chelators containing electron withdrawing nitro groups on 1,3,5-triazapentadienyl ligands were synthesized. These are used as supporting ligands to study the chemical bonding interactions between copper(I) ethylene, copper(I) carbonyl and copper(I) phosphine complexes. All these copper(I) complexes supported by of fluorinated 1,3,5-triazapentadienyl ligands containing nitro groups are stable in air. 13C NMR chemical shifts of the copper(I) ethylene complexes, and the stretching frequencies of the copper(I) carbonyl complexes indicate that the copper atoms are acidic due to the weakly donating nature of fluorinated 1,3,5-triazapentadienyl ligands.;New Bis(NHC) salt containing propyl bridge backbone was synthesized. Deprotonation of this salt led to free and remarkably stable bis(NHC). X-ray diffraction analysis have shown that the methyl substituents on the nitrogen atom of carbenes are trans to each other. In addition, macrocycle silver(I) adduct was obtained by the reaction of free bis(NHC) and silver(I) triflate. The X-ray structure analysis of this macrocycle revealed that it contains two silver(I) atoms and two bis( NHC) ligands.;Interaction of coinage metal ions to NHC stabilized phosphinidine has been studied by spectroscopic techniques. The bis-copper(I) chloride, bis-silver(I) chloride, and bis-gold(I) chloride adducts of NHC phosphinides are obtained. The bis-gold(I) chloride adduct was found to be remarkably stable in air.