Electronic absorption and MCD spectra for the Pt(PPh3)(AuPPh3)(6)(2+) and Pt(H)(PPh3)(AuPPh3)(7)(2+) cluster complexes

摘要

Electronic absorption and 7.0 tesla magnetic circular dichroism (MCD) spectra are reported for acetonitrile solutions of [Pt(PPh3)(AuPPh3)(6)](NO3)(2) and [Pt(H)(PPh3) (AuPPh3)(7)] (NO3)(2) at room temperature in the range of 1.8 to 3.7 mu m(-1) (1 mu m(-1) = 10(4) cm(-1)). The spectra are assigned to intraframework (IF) transitions from an Au based HOMO to empty Au framework orbitals. In addition evidence is presented for Pt(5d) --> Au transitions for Pt(PPh3)(AuPPh3)(6)(2+) from intense low energy MCD features. (C) 1998 Elsevier Science S.A. All rights reserved. [References: 7]