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The title mol­ecule, C14H12N2O2, exhibits a V-shaped conformation with a dihedral angle of 59.69 (3)° between the benzene and pyridine rings. In the crystal, O—H...N hydrogen bonds link the mol­ecules into zigzag chains along [010].

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The title mol­ecule, C14H12N2O2, forms a dimeric unit linked by a pair of symmetry-equivalent O—H...N hydrogen bonds. The aromatic rings are significantly twisted from each other with a dihedral angle of 44.04 (4)°.

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The title compound, {[Cu(C17H11N2O3)2(H2O)]·2H2O}n, is a two-dimensional polymer. The Cu2+ ion lies on the crystallographic twofold axis. The coordination sphere of the Cu2+ ion can be described as a distorted square pyramid. All of the H atoms in the amide group and lattice water mol­ecules participate in O—H...O or N—H...O hydrogen bonding to strengthen the two-dimensioal framework of the polymer.

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In the title mol­ecule, C17H12N2O3, the naphthalene ring system and the pyridin-3-yl rings are nearly coplanar with a dihedral angle between them of 2.28 (8)°. In the crystal, the hy­droxy and amide N atoms participate in hydrogen bonds, which connect the mol­ecules into a two-dimensional network parallel to (101).
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