Synthesis and coordination chemistry of 1-(2′,2″-bipyridyl-5′-yl-methyl)-1,4,8,11-tetraazacyclotetradecane L 1 . Quenching of fluorescence from [Ru(bipy) 2 (L 1 )] 2+ by coordination of Ni II or Cu II in the cyclam cavity (bipy = 2,2′-bipyridine; cyclam = 1,4,8,11-tetra-azacyclotetradecane)