Novel Coordination Polymers Generated from Angular 2,2′‐Dipyridyl Ligands and Bis(hexafluoroacetylacetonate) Copper(II): Crystal Structures and Magnetic Properties

摘要: The synthesis of the ligand 2,5-bis(2-pyridylethynyl)thiophene (L2) is described and coordination chemistry 2,2′-long conjugated bidentate ligands 1,2-di(2-pyridyl)butadiyne (L1), (L2), 2,2′-dipyridyl disulfide (L3) with Cu(hfac)2 (hfac = hexafluoroacetylacetonate) investigated. Three new polymers {[Cu(hfac)2L]n (1 for L L1, 2 L2 3 L3)} are prepared fully characterized by infrared spectroscopy, elemental analysis, thermogravimetric X-ray diffraction. They obtained a combination L2, or L3 Cu(hfac)2·H2O in dichloromethane (CH2Cl2) as solvent. When CH2Cl2 solutions were left standing longer than one day refluxed two days, rearrangements took place was transformed into 4 5. Compounds 1–3 adopt one-dimensional chain structure copper atom six-coordinate 4+2 pseudooctahedral geometry. In 1 2, four equatorial sites Cu–O/N axial Cu–O found an unusual cis orientation L1 ligands, respectively, while defined oxygen atoms from hfac chelating nitrogen donors trans-L3 ligands. Compound contains (1-hydro-2-pyridinio)thio group that bound to hexafluoroacetylacetonate anion through S–C bond 5 molecular compound where CuII ion pentacoordinate anion, 2-pyridyl sulfide fragments, carbon CC(O)CF3 fragment, which has been inserted S–S ligand, giving tridentate ligand. reaction acetate leads 1:2 adduct Cu2(μ-OAc)4(L3)2 (6), different anions pyridine ring form square-pyramidal (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)