Add time:08/01/2019         Source:sciencedirect.com

We report the hitherto unreported pyrene footed calix[4]resorcinarene (P1) supramolecular assembly and its tetranuclear Ru(II) polypyridyl complexes, [{Ru(phen)2}4(L)](ClO4)8 (CP1), [{Ru(bpy)2}4(L)](ClO4)8 (CP2), and [{Ru(P2)2}4(L)](ClO4)8 (CP3) [where, L = 2,8,14,20-tetra(pyren-1-yl)-5,11,17,23-tetrakis((2-(pyridin-2-yl)-1H-benzimidazol-1-yl)methyl)-4,6,10,12,16,18,22,24-octahydroxy-calix[4]resorcinarene and P2 = 2-(pyridin-2-yl)-1H-benzimidazole]. The single crystal structure of 2,8,14,20-tetra(pyren-1-yl)-4,6,10,12,16,18,22,24-octahydroxycalix[4]-resorcinarene (P1) possesses all cis configuration and a boat like conformation with pyrene rings occupying the axial positions. The tetranuclear complexes, CP1, CP2 and CP3, show decreasing energy of 3MLCT luminescence at 298 K but the intensity is increased at 77 K in frozen acetonitrile due to lowering of energy gap between π* of the ligand and the d orbital of ruthenium metal ion. The luminescence quantum yield has also been increased considerably in all the complexes when the temperature is decreased from 298 K to 77 K due to the lowering of nonradiative decay pathways. The complexes exhibit a single exponential decay profile in acetonitrile at 298 K. The cyclic voltammograms of the complexes show simultaneous four single electron quasireversible redox processes.

We also recommend Trading Suppliers and Manufacturers of CIS-DICHLOROBIS(PYRIDINE)PLATINUM(II) (cas 15227-42-6). Pls Click Website Link as below: cas 15227-42-6 suppliers