Synthesis, characterisation and thermal studies of ruthenium(II) carbonyl complexes of functionalised tripodal phosphine chalcogen donor ligands, [CH(3)C(CH(2)P(X)Ph(2))(3)], where X=Se, S, O.
The polymeric ruthenium(II) carbonyl complex, [Ru(CO)(2)Cl(2)](n) reacts with 1,1,1-tris-(diphenylphosphinomethyl)ethane trichalcogenide ligands, [CH(3)C(CH(2)P(X)Ph(2))(3)], where X=Se(a), S(b) and O(c) in 1:1 (metal:ligand) molar ratio to afford hexa-coordinated complexes of the type eta(2)-(X,X)-[Ru(CO)(2)Cl(2)P(3)X(3)] (1a-c). The complexes 1a-c exhibit two equally intense nu(CO) bands in the range 1979-2060cm(-1) indicating cis-disposition of the two terminal carbonyl groups. The values of nu(CO) frequencies containing different ligands, in general, follow the order: P(3)O(3)>P(3)S(3)>P(3)Se(3) which may be explained in terms of 'Soft-Hard' (Ru(II)-O) and 'Soft-Soft' (Ru(II)-S/Se) interactions. The complexes have been characterized by elemental analyses, mass, (1)H, (31)P, (77)Se and (13)C NMR spectroscopy. The thermal stability of the complexes has also been studied.
Deb
Biswajit
B
Materials Science Division, North-East Institute of Science and Technology, Jorhat 785 006, Assam, India.
Sarmah
Bhaskar Jyoti
BJ
Borah
Bibek Jyoti
BJ
Dutta
Dipak Kumar
DK
D018011:Chalcogens / Q000737:chemistry*; D008024:Ligands; D015394:Molecular Structure; D010720:Phosphines / Q000737:chemistry*; D017975:Ruthenium Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D013053:Spectrophotometry; D013696:Temperature
D018011:Chalcogens; D008024:Ligands; D010720:Phosphines; D017975:Ruthenium Compounds