Self-Assembly and Host — Guest Interaction of Metallomacrocycles Using Fluorescent Dipyrazole Linker with Dimetallic Clips.

By employing diimine ligands coordinated dimetallic clips ([(bpy)2Pd2(NO3)2](NO3)2 or [(phen)2Pd2(NO3)2](NO3)2, where bpy = 2,2'-bipyridine, phen = 10-phenanthroline) as the corner and anthracene-, naphthalene-, and benzene-based dipyrazolate dianions as the linker, a series of positively charged metallomacrocycles ([M4L2]4+ or [M8L4]8+) have been synthesized through a directed self-assembly method in aqueous solution. Every macrocycle has a cavity to bind solvent molecules or anions. The structures were characterized by elemental analysis, H and 13C NMR, etectrospray ionization mass spectrometry, and single crystal X-ray diffraction analysis for compound 1 ∙4PF6 (1 = ([(bpy)Pd]4L52)4+), 3 ∙ 4PF6 8CH3CN ∙ 1-120(3 = (((bpy)Pd)4L22)4+), and 7 ∙ 4PF6 - 61-420(7 = ([(bpy)Pd]4L52)4+). The 1:1 host-guest complexation for anthracene-based dipyrazolate-bridged macrocycles with aromatic guests was investigated via UV-vis and fluorescent titration. [ABSTRACT FROM AUTHOR]