A single- and double-flash flash photolysis study of the sequential biphotonic photoprocesses of Cu(I) phenanthrolines. Comparison of the helicate complex, [Cu-2(1,3-bis(9-methyl-1,10-phenanthrolin-2-yl)propane)(2)](2+), and [Cu(2,9-dimethyl-1,10-phenanthroline)(2)](+) photoprocesses