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A photochromic dinuclear compound: aquatetrakis(μ‐2,3‐diphenylprop‐2‐enoato)bis(2,3‐diphenylprop‐2‐enoato)ethanolbis(1,10‐phenanthroline)dilanthanum(III)

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The title dinuclear complex, (aqua‐1κO)tetrakis(μ‐2,3‐diphenylprop‐2‐enoato‐1:2κ2 O:O′)bis(2,3‐diphenylprop‐2‐enoato)‐1κO;2κO‐(ethanol‐2κO)bis(1,10‐phenanthroline)‐1κ2 N,N′;2κ2 N,N′‐dilanthanum(III), [La2(C15H11O2)6(C12H8N2)2(C2H5OH)(H2O)], contains two similar LaIII centres with distorted [LaO6N2] bicapped triganol–prismatic coordination polyhedra formed by six phenylcinnamate (PCA or 2,3‐diphenylprop‐2‐enoate) ligands, two 1,10‐phenanthroline (phen) ligands, a coordinating ethanol molecule and a coordinating water molecule. The two metal centres are bridged by four μ‐PCA ligands, with the remaining two PCA ligands coordinated in a monodentate fashion. The noncoordinated carboxylate O atoms on the terminal PCA ligands form O—H...O hydrogen bonds with the coordinated solvent molecules. Each La centre is also coordinated by a bidentate phen ligand. The PCA ligands all adopt synsyn orientations, with the two phenyl rings presenting dihedral angles of about 70°. The compound displays photochromic behaviour both in solution and in the solid state.
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Document Type: Research Article

Publication date: September 15, 2011

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