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Issue 41, 2016
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Heteroleptic [Os(H)(CO)(NN)(tpp)2]+ and [Os(Cl)(CO)(NN)(tpp)2]+ complexes – comparative studies of their luminescence properties

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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 (NN) ligand were prepared from an OsCl2(CO)2(tpp)2 precursor. The investigated complexes, available in the form of PF6 salts, have been identified by means of FT-IR, 1H and 31P 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 NN 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 emissive 3*[Os(H)(CO)(NN)(tpp)2]+ and 3*[Os(Cl)(CO)(NN)(tpp)2]+ species.

Graphical abstract: Heteroleptic [Os(H)(CO)(N∧N)(tpp)2]+ and [Os(Cl)(CO)(N∧N)(tpp)2]+ complexes – comparative studies of their luminescence properties

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Supplementary files

Article information


Submitted
24 Aug 2016
Accepted
25 Sep 2016
First published
11 Oct 2016

Phys. Chem. Chem. Phys., 2016,18, 28982-28996
Article type
Paper

Heteroleptic [Os(H)(CO)(NN)(tpp)2]+ and [Os(Cl)(CO)(NN)(tpp)2]+ complexes – comparative studies of their luminescence properties

A. Kamecka, K. Suwińska and A. Kapturkiewicz, Phys. Chem. Chem. Phys., 2016, 18, 28982
DOI: 10.1039/C6CP05856F

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