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The product obtained from the reaction of pyridine-2,3-di-carb-oxy-lic acid and hydrated copper(II) chloride in hot aqueous NaOH solution was determined by low temperature X-ray diffraction to be [Cu 3 (C 6 H 4 NO 3 ) 4 (OH) 2 (H 2 O) 2 ]  n  or [Cu 3 (μ-OH) 2 (μ-nicNO) 4 (H 2 O) 2 ]  n  (nicNO is pyridine-3-carboxyl-ate N -oxide), a structure obtained from room temperature data and reported previously. The present determination is improved in quality and treatment of the H atoms. A Hirshfeld surface analysis of the inter-molecular inter-actions is presented.

A redetermination of the structure and Hirshfeld surface analysis of poly[diaquadi-μ-hydroxido-tetrakis(μ-nicotinato N-oxide)tricopper(II)]