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Spectroscopic Studies of Cyclometallated Pd(II) and Pt(II) Complexes: Optical absorption and emission of single crystals of [Pd(thpy)2] and [Pt(thpy)2]

✍ Scribed by Raimund Schwarz; Günter Gliemann; Laurent Chassot; Philippe Jolliet; Alex von Zelewsky

Publisher
John Wiley and Sons
Year
1989
Tongue
German
Weight
659 KB
Volume
72
Category
Article
ISSN
0018-019X

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✦ Synopsis

The polarized optical absorption and emission (spectra, decay times) of single crystals of [Pd(thpy),] and [Pt(thpy),] (thpy = C(3')-deprotonated form of 2-(2-thienyl)pyridine) at temperatures 1.9 K I T I 80 K are reported. The emission of [Pt(thpy),] can be influenced strongly by applied magnetic fields (0 I H I 6 T). Depending on the central ions Pd and Pt, the lowest excited electronic states of the single complexes are ligand-centered (LC) states and metal-to-ligand charge transfer (MLCT) states, respectively. This difference leads to distinctly dissimilar properties of the emission of both compounds. The experimental data show that the emission of single crystals of [Pd(thpy),] and [Pt(thpy),] at T < 30 K originates from several types of traps (defect states of symmetry 3B2-stabilized below the exciton band) with LC and MLCT character, respectively. In the Pt compound, the 3B2 is split by spin-orbit coupling into three states. The states B; and A;, which determine the emission properties, are separated by A 3 -13 cm-'. Both states can mix under the influence of an applied magnetic field yielding an increase of the emission intensity by a factor of -1.5 at H = 6 T.

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