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Title: Structure, physical and photophysical properties of platinum(II) complexes containing bidentate aromatic and bis(diphenylphosphino)methane as ligands

Abstract

This study focuses on a series of Pt{sup II}(L-L{prime})(dppm){sup n+} complexes, where dppm is bis(diphenylphosphino)methane and L-L{prime} are C(caret)C{prime} (n = 0), C(caret)N (n = 1), and N(caret)N{prime} (n = 2) aromatic ligands. Structural characteristics are reported. Structural features indicate that the Pt-C bond distance is shorter than the Pt-N bond distance in symmetrical complexes and that the Pt-P bond distance trans to N is shorter than the Pt-P bond trans to C. This is consistent with the {sup 31}P NMR spectra where the chemical shift of the P trans to C is {approximately}10 ppm less than found for P trans to N. The energy maxima of the metal-to-ligand charge-transfer band for the complexes containing various L-L{prime} ligands occur in the near-UV region of the spectrum and fall into the energy series bpy > bph > phen > 2-phpy > 2-ptpy > 2-phq > 7,9-bzq, where bpy is 2,2{prime}-bipyridine, 2-phpy is 2-phenylpyridine, 2-ptpy is 2p-tolylpyridine, and 7,8-bzq is 7,8-benzoquinoline. The emission energy maxima, ascribed to variance in metal-perturbed triplet ligand centered emission, commence near 500 nm and follow the series phen > bpy > 7,8-bzq > 2-phpy > 2-ptpy > bph > 2-phq. In general, emission is observed at 77more » K and in solution at low temperatures, but the temperature dependence of the emission lifetimes indicates thermal activation to another state occurs with an energy of {approximately}1,800 cm{sup {minus}1} for the complexes, with the exception of [Pt(bph)(dppm)], which has an activation energy of {approximately}2,300 cm{sup {minus}1}.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Wichita State Univ., KS (US)
OSTI Identifier:
20075879
Resource Type:
Journal Article
Journal Name:
Inorganic Chemistry
Additional Journal Information:
Journal Volume: 39; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0020-1669
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SYNTHESIS; PLATINUM COMPLEXES; AROMATICS; ORGANIC PHOSPHORUS COMPOUNDS; PHYSICAL PROPERTIES; LUMINESCENCE; TEMPERATURE DEPENDENCE

Citation Formats

DePriest, J., Zheng, G.Y., Goswami, N., Eichhorn, D.M., Woods, C., and Rillema, D.P. Structure, physical and photophysical properties of platinum(II) complexes containing bidentate aromatic and bis(diphenylphosphino)methane as ligands. United States: N. p., 2000. Web. doi:10.1021/ic991306d.
DePriest, J., Zheng, G.Y., Goswami, N., Eichhorn, D.M., Woods, C., & Rillema, D.P. Structure, physical and photophysical properties of platinum(II) complexes containing bidentate aromatic and bis(diphenylphosphino)methane as ligands. United States. doi:10.1021/ic991306d.
DePriest, J., Zheng, G.Y., Goswami, N., Eichhorn, D.M., Woods, C., and Rillema, D.P. Mon . "Structure, physical and photophysical properties of platinum(II) complexes containing bidentate aromatic and bis(diphenylphosphino)methane as ligands". United States. doi:10.1021/ic991306d.
@article{osti_20075879,
title = {Structure, physical and photophysical properties of platinum(II) complexes containing bidentate aromatic and bis(diphenylphosphino)methane as ligands},
author = {DePriest, J. and Zheng, G.Y. and Goswami, N. and Eichhorn, D.M. and Woods, C. and Rillema, D.P.},
abstractNote = {This study focuses on a series of Pt{sup II}(L-L{prime})(dppm){sup n+} complexes, where dppm is bis(diphenylphosphino)methane and L-L{prime} are C(caret)C{prime} (n = 0), C(caret)N (n = 1), and N(caret)N{prime} (n = 2) aromatic ligands. Structural characteristics are reported. Structural features indicate that the Pt-C bond distance is shorter than the Pt-N bond distance in symmetrical complexes and that the Pt-P bond distance trans to N is shorter than the Pt-P bond trans to C. This is consistent with the {sup 31}P NMR spectra where the chemical shift of the P trans to C is {approximately}10 ppm less than found for P trans to N. The energy maxima of the metal-to-ligand charge-transfer band for the complexes containing various L-L{prime} ligands occur in the near-UV region of the spectrum and fall into the energy series bpy > bph > phen > 2-phpy > 2-ptpy > 2-phq > 7,9-bzq, where bpy is 2,2{prime}-bipyridine, 2-phpy is 2-phenylpyridine, 2-ptpy is 2p-tolylpyridine, and 7,8-bzq is 7,8-benzoquinoline. The emission energy maxima, ascribed to variance in metal-perturbed triplet ligand centered emission, commence near 500 nm and follow the series phen > bpy > 7,8-bzq > 2-phpy > 2-ptpy > bph > 2-phq. In general, emission is observed at 77 K and in solution at low temperatures, but the temperature dependence of the emission lifetimes indicates thermal activation to another state occurs with an energy of {approximately}1,800 cm{sup {minus}1} for the complexes, with the exception of [Pt(bph)(dppm)], which has an activation energy of {approximately}2,300 cm{sup {minus}1}.},
doi = {10.1021/ic991306d},
journal = {Inorganic Chemistry},
issn = {0020-1669},
number = 9,
volume = 39,
place = {United States},
year = {2000},
month = {5}
}