3 years ago

Different structures of two Cu(I) complexes constructed by bridging 2,2-(1,4-butanediyl)bis-1,3-benzoxazole ligand: Syntheses, structures and properties

Different structures of two Cu(I) complexes constructed by bridging 2,2-(1,4-butanediyl)bis-1,3-benzoxazole ligand: Syntheses, structures and properties
Reaction of 2,2-(1,4-butanediyl)bis-1,3-benzoxazole (BBO) ligand with [Cu(CH3CN)2(PPh3)2][X] (X=ClO4, PF6) afforded a copper(I) coordination polymer (CP) {[Cu(BBO)(PPh3)] . ClO4} (1) and a binuclear complex [Cu2(BBO)(PPh3)4] . 2PF6 . 2CH2Cl2 (2) (where PPh3 =triphenylphosphine). Two complexes have been characterized. The structural analysis revealed that in complexes 12, all Cu(I) ions are tri-coordinated and the geometric structure around the central Cu(I) atom can be described as planar trigonal configuration. Complex 1 exhibits a one-dimensional coordination polymer by two BBO bridging adjacent copper(I) ions and extending along the b axis, forming a single-stranded helix chain structure that extends into 2-D layer frameworks through ππ interactions. Complex 2 shows a binuclear structure and the unit extends to a 2D supramolecular layered framework through C-HF interactions. Moreover, compared with emissive bands of the free ligand in the solid state, the photoluminescent transition of the Cu(I) complexes 12 may be attributed to metal-to-ligand charge-transfer [MLCT].

Publisher URL: www.sciencedirect.com/science

DOI: S002016931731174X

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