Acetylides, donor-acceptor complexes

For example, in 1963 the photochemistry of magnesium phthalocyanine with coordinated uranium cations was studied in pyridine and ethanol and indicated the occurrence of PET to the uranium complex . A rapid photoinduced electron transfer (2-20 ps) followed by an ultrafast charge recombination was shown for various zinc and magnesium porphyrins linked to a platinum terpyridine acetylide complex . The results indicated the electronic interactions between the porphyrin subunit and the platinum complex, and underscored the potential of the linking para-phenylene bisacetylene bridge to mediate a rapid electron transfer over a long donor-acceptor distance. 

An isocyanide ligand, RNC, is isoelectronic with a cyanide, acetylide, or carbonyl ligand. Isocyanides coordinate to a metal in an end-on mode through the isocyanide carbon atom, and they are good mixed-ligand complexes can be prepared with isocyanide ligands, and they are high in the spectrochemical series. 

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