title: Heteroleptic [Os(H)(CO)(N∧N)(tpp)2]+and [Os(Cl)(CO)(N∧N)(tpp)2]+complexes - comparative studies of their luminescence properties.
abstract: Two series of cationic heteroleptic osmium(ii) complexes with a coordinated CO molecule, a chloride Cl-or hydride H-anion, two monodentate triphenylphosphine (tpp) ligands and one bidentate α-dimine (N∧N) ligand were prepared from an OsCl2(CO)2(tpp)2precursor. The investigated complexes, available in the form of PF6-salts, have been identified by means of FT-IR,1H and31P NMR spectroscopy and X-ray diffraction studies. Their photophysical properties have been investigated in dichloromethane solutions at room temperature and 1 : 1 ethanol-methanol matrices at 77 K. The investigated complexes exhibit metal to ligand charge-transfer (MLCT) phosphorescence with the emission characteristics distinctly affected by the nature of coordinated α-diimine N∧N and Cl-or H-ligands. Franck-Condon emission spectral band shape analyses and DFT/TD-DFT calculations have been applied to obtain more detailed insight into the nature of emissive3*[Os(H)(CO)(N∧N)(tpp)2]+and3*[Os(Cl)(CO)(N∧N)(tpp)2]+species.
authors.affiliation: Institute of Chemistry, Faculty of Sciences, Siedlce University of Natural Sciences and Humanities, 3 Maja 54, 08-110 Siedlce, Poland. andrzej.kapturkiewicz@uph.edu.pl.
authors.forename: Anna
authors.initials: A
authors.lastname: Kamecka
authors.affiliation: Faculty of Mathematics and Natural Sciences, Cardinal Stefan Wyszynski University in Warsaw, K. Woycickiego 1/3, 01-938 Warszawa, Poland.
authors.forename: Kinga
authors.initials: K
authors.lastname: Suwińska
authors.affiliation: Institute of Chemistry, Faculty of Sciences, Siedlce University of Natural Sciences and Humanities, 3 Maja 54, 08-110 Siedlce, Poland. andrzej.kapturkiewicz@uph.edu.pl.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Kapturkiewicz