The coordination chemistry of fluorescent pyridinyl— andquinolinyl—phthalimide ligands with the {Au~I—PPh_3} cationic unit

摘要

The new mono-dentate ligands, 2-(2-aminoethyl)-N-phthalimido-pyridine (L4) and 8-amino-N-phthalimido-quinoline (L6), were synthesised using a solvent-free melt method. Theseligands together with L'-3'5 (3-amino-N-phthalimido-pyridine; 3-aminomethyl-N-phthalimido-pyridine;4-aminomethyl-N-phthalimido-pyridine; 3-amino-N-phthalimido-quinoline) were then used to accesssix luminescent Au' complexes of the generic type {Ph3P-Au-L"}(0TO. X-Ray crystallography hasbeen used to structurally characterise three of the complexes showing that in the cases of L' and L3 thecomplexes adopt an approximately linear P-Au-N coordination geometry. However, in the case of thesterically demanding L6 the structure shows distortions within the ligand and deviations from a linearcoordination geometry. Solution state 'H and 31P{' H} NMR confirmed that the proposed formulationsand coordination modes exist in solution. At room temperature the photophysical studies showed thatthe emission from each of the six complexes was in the visible region (395-475 nm) and assigned to aligand-centred fluorescence (r < 10 ns) in each case.