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- W2004697906 abstract "The crystal structures of the metal-free ligand 6,6'-(1-methoxypropylidene)bis(2-pyridinecarboxylic acid) monohydrate, C 16 H 16 N 2 O 5 .H 2 O (1), the complex aqua{6,6'-[1-(2-pyridylmethoxy)propylidene]bis(2-pyridinecarboxylato-N,O)}copper(II), [Cu(C 21 H 17 N 3 O 5 )(H 2 O)] (2), and the dimeric complex bis[μ-6,6'-{(methoxy)[3-(3-pyridylmethoxy)phenyl]methylene}bis(2-pyridinecarboxylato)-N,N',O,O″:N″]dicopper(II) monohydrate, [Cu 2 (C 26 H 19 N 3 O 6 ) 2 ].H 2 O (3), have been studied by X-ray diffraction. In the crystal of (1) the dipyridylmethane moiety adopts an anti conformation, with the two aromatic rings almost perpendicular to each other. This molecular conformation, as well as the crystal packing, are stabilized by hydrogen bonds involving the water molecule. The Cu II ion in (2) has square-pyramidal coordination, with the apex position occupied by the water O atom. The aromatic rings are slightly bent from the plane formed by the two cis-positioned N atoms and the two carboxylic O atoms of the ligand molecule. The apical water O atoms link successive molecules into infinite chains via hydrogen bonds. The chains, held together by weak electrostatic interactions besides the van der Waals forces, are arranged so as to form a layer structure. (3) also contains a five-coordinate Cu II ion with a square-pyramidal coordination polyhedron. The axial position is occupied by an N atom, N(22), belonging to the pendant arm of the neighbouring molecule. Thus, (3) forms a dimer although the crystallographic asymmetric unit contains only half the dimeric formula unit. The water O atom, having only a half site occupation, does not coordinate to the Cu ion. In the crystal the dimeric molecules stack, with alternating orientation, along the unique b axis" @default.
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- W2004697906 date "1995-03-15" @default.
- W2004697906 modified "2023-09-26" @default.
- W2004697906 title "Complexation with Ligands Containing a Dipyridylmethane Unit. Structures of a Free Ligand and Two Copper(II) Complexes" @default.
- W2004697906 doi "https://doi.org/10.1107/s010827019400853x" @default.
- W2004697906 hasPublicationYear "1995" @default.
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