Copper(II) complexes with monocarboxylate ligands bearing different substituent groups: Synthesis and spectroscopic studies

摘要: Abstract In our continuing efforts to explore the effects of substituent groups ligands in formation supramolecular coordination structures, seven new CuII complexes formulated as [Cu2(L1)4(DMF)2] (1), {[Cu2(L1)4(Hmta)](H2O)0.75}∞ (2), [Cu2(L2)4(2,2′-bipy)2] (3), [Cu2(L3)4(H2O)2] (4), [Cu2(L3)4(Hmta)]∞ (5), [Cu2(L3)4(Dabco)]∞ (6) and [Cu2(L3)4(Pz)]∞ (7) with three monocarboxylate bearing different HL1–HL3 (HL1 = phenanthrene-9-carboxylic acid, HL2 = 2-phenylquinoline-4-carboxylic HL3 = adamantane-1-carboxylic Hmta = hexamethylenetetramine, 2,2′-bipy = 2,2′-bipyridine, Dabco = 1,4-diazabicyclo[2.2.2] octane Pz = pyrazine), have been prepared characterized by X-ray diffraction. 1, 2 4–7, each ion is octahedrally coordinated, carboxylate acid acts a syn–syn bridging bidentate ligand. While 3 penta-coordinated distorted square-pyramidal geometry. 1 4 both show dinuclear paddle-wheel block, while 2, 5, 6 7 all exhibit an alternated 1D chain structure between units tetracarboxylate type Cu2-(RCO2)4 auxiliary Hmta, Dabco Pz. Furthermore, has carboxylic unidentate μ1,1-oxo chelating ligand 2,2′-bipy. Moreover, 1–6 were electron paramagnetic resonance (EPR) spectroscopy.