Spectroscopic studies of cyclo-metallated pt(II) complexes: spectroscopic evidence of strong inter-complex coupling in single crystal [Pt(bpm)(CN)2]·DMF(bpm = 2, 2′-bipyrimidine)

Autor:	G. Gliemann, Ulrich Klement, Josef Biedermann, Manfred Zabel, Klaus-Jürgen Range
Rok vydání:	1990
Předmět:	chemistry.chemical_classification Stereochemistry Chemistry Crystal structure Blueshift Inorganic Chemistry Crystallography Materials Chemistry Molecule Physical and Theoretical Chemistry Absorption (chemistry) Electronic band structure Single crystal Inorganic compound Monoclinic crystal system
Zdroj:	Inorganica Chimica Acta. 171:35-40
ISSN:	0020-1693
DOI:	10.1016/s0020-1693(00)84660-5
Popis:	The optical properties (polarized absorption and emission) of single crystal [Pt(bpm)(CN)2]·DMF under variation of temperature (1.9 K ⩽T⩽295 K) and homogeneous magnetic fields (0⩽H⩽ 6 T) are reported. When the magnetic field strength is raised from H=0 to 6 T, the low-temperature emission is blue shifted by 220 cm−1, the intensity increases by a factor of ∼27, and the lifetime is reduced from τ=1.8 ms to 15 μs. The spectroscopic results are explained on the basis of the crystal structure of [Pt(bpm)(CN)2]·DMF, which exhibits columns of [Pt(bpm)(CN)2] complexes with a nearly face-to-face arrangement and relatively short PtPt distances (∼3.28 A), yielding a distinct inter-complex coupling. Crystallographic data for [Pt(bpm)(CN)2]·DMF: monoclinic, space group P21/m, a=10.702(2), b =6.518(1), c=10.700(2) A,β=95.57(2)°, V=742.86 A3, Z=2, Dc=2.14g cm−3, μ(Mo Kα)=95.5 cm−1, R=0.069, Rw=0.056 for 113 variables and 3497 reflexes with I > 3σ(I).
Databáze:	OpenAIRE
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