497101-65-2Relevant academic research and scientific papers
Structural, photophysical, and nonlinear absorption properties of trans-Di-arylalkynyl platinum(II) complexes with phenyl and thiophenyl groups
Lind, Per,Bostroem, Dan,Carlsson, Marcus,Eriksson, Anders,Glimsdal, Eirik,Lindgren, Mikael,Eliasson, Bertil
, p. 1598 - 1609 (2008/10/09)
Optical power limiting and luminescence properties of two Pt(II) complexes with thiophenyl and phenyl groups in the ligands, trans-Pt(P(n-Bu) 3)2(C≡C-Ar)2, where Ar = -C 4H2S-C=C≡C-p-C6H4-n-C 5H11 (1) and -p-C6H4-C≡C- C4H3S (2), have been investigated. The fluorescence lifetimes were found to be on the sub-nanosecond time scale, and the quantum yields were low, in accord with fast intersystem crossing from the excited singlet to triplet manifold. The phosphorescence lifetimes of 1 and 2 were shorter than that of a Pt(II) complex having two phenyl groups in the ligands. In order to elucidate the C-Pt bonding nature in the ground state, the 13C NMR chemical shift of the carbon directly bonded to Pt, the coupling constants 1JPtC, 2JPtC, and 1JPtP, and IR vC≡C wavenumbers were obtained for 1, 2, and three other trans-diarylalkynyl Pt(II) complexes. X-ray diffraction data of 1 and 2 and density functional theory calculated geometries of models of 1, 2, and trans-Pt(P(n-Bu)3)2(C≡C-p- C6H4-C≡C-C6H5)2 (3) show that 1 preferably exists in a different conformation from that of 2 and 3. The variations in photophysical, NMR, and IR data can be rationalized by differences in geometry and π-backbonding from Pt to the alkynyl ligand.
