Optical, electrochemical, and catalytic properties of the unsaturated host Pd3(dppm)3(CO)2+ and Pd4(dppm)4(H)22+ clusters:: An overview

This paper presents an overview of the optical, photophysical, and photochemical properties including UV-visible and luminescence spectra in solution at 298 and 77 K, along with electrochemical, and catalytic behavior under reduction conditions ( for both thermally and electrochemically assisted systems) of the tri- and tetranuclear Pd-3(dppm)(3)(CO)(2+) and Pd-4(dppm)(4)(H)(2)(2+) clusters (dppm = bis(diphenylphosphino) methane). This review is also complemented with relevant information about their syntheses, molecular and electronic structures supported from computer modeling, EHMO and DFT calculations, and their host-guest behavior with anions and neutral molecules, in relation with their observed reactivity.