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- W2076575722 abstract "Abstract The crystal structure of the complex of Cu2+ and racemic tartaric acid formed in basic solution has been determined by X-ray analysis. The crystals of Na2[Cu-d,l-C4O6H2]·5H2O are monoclinic, a=9.290(4), b=10.894(5), c=11.556(5) Å, and β=94.85(6)° the space group is P21/n. The structure has been refined to an R-factor of 0.040 on 1852 non-zero structure amplitudes measured on an automatic diffractometer. The structure consists of centrosymmetric dimeric tetranegative anions [Cu2 d-tartrate, l-tartrate]4-, with each Cu2+ ion forming a square planar complex with two ionized carboxyl and two ionized hydroxyl oxygen atoms. There is no fifth coordination to the Cu2+ ion. The Cu‒Cu distance within the dimer is 2.9869(7) Å and the Cu2+ ions are slightly displaced (0.0617 Å) from the plane through their four coordinating oxygen atoms towards the other half of the dimer. The crystal structure is completed by a rather complex organization of Na+ octahedra and water molecules. All the water molecules form hydrogen bonds in a rather regular fashion to the tetranegative complex anion so as to leave a small hole above the Cu2+ ion but which is not large enough to accommodate a fifth coordination to Cu2+." @default.
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- W2076575722 date "1972-11-01" @default.
- W2076575722 modified "2023-09-24" @default.
- W2076575722 title "THE CRYSTAL AND MOLECULAR STRUCTURE OF TETRASODIUM DICOPPER(II)-<i>dl</i>-TARTRATE DECAHYDRATE" @default.
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- W2076575722 doi "https://doi.org/10.1080/00958977208072964" @default.
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