Reaction of [Rh2{µ-1,8-(NH)2C10H6}(CO)2(PPh3)2] with [M(PPh3)]+(M = Au, Ag, or Cu): formation of unusual 44-electron Rh2M clusters. Crystal structure of [Rh2{µ-Au(PPh3)}{µ-1,8-(NH)2C10H6}(CO)2(PPh3)2]ClO4·2CH2Cl2