To date, hydrocarbons have been used as solvents for the photolysis.

Present studies have concentrated on the use of dichloromethane as a solvent since:

1) Mononuclear complexes are obtained in quantitative yields.

2) Reaction time is shorter.

3) Intermediates are stable for considerably greater periods of time than in

hydrocarbon solvents.

4) There is a considerably wider scope for reaction chemistry in

dichloromethane since it is considerably more polar than hydrocarbons

allowing for solvation of high nuclearity clusters and charged species.

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