The reaction of Pt(CN)2⋅xH2O with dppm [bis(diphenylphosphino)methane] in refluxing dimethylformamide (DMF) yielded Pt2(dppm)2(CN)4. The X-ray structure of this binuclear platinum(II) complex has been determined: Pt2(dppm)2(CN)4⋅2DMF, space group P21/n Z = 2, a = 11.561 (1) Å, b = 17.475 (1) Å, c = 13.981 (5) Å, β = 95.34 (2)°. The Pt2(dppm)2(CN)4molecule adopts the trans,trans geometry and consists of two platinum atoms bridged by two dppm groups, with two trans cyanide ions bonded to each platinum atom. The measured Pt.Pt distance is 3.301 (1) Å, indicative of a weak Pt.Pt bonding interaction. The UV-vis absorption spectrum of methanolic solutions of Pt2(dppm)2(CN)4exhibits an intense band at 324 nm 10500) (εmax10 500) and a weak band at ca. 390 nm, assigned to the1A1g→1Bluand1A1g→3Blutransitions, respectively. Excitation of Pt2-(dppm)2(CN)4at 324 nm in degassed methanol leads to an intense emission at 425 nm with a shoulder at ca. 530 nm. The room-temperature triplet lifetime has been found to be 0.23 μs in degassed methanol.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry