Abstract
We report the synthesis, crystal structures, magnetic properties, and thermal behavior of a family of isostructural transition metal gallate dihydrates containing infinite chains of trans-corner-sharing M O 6 octahedra. The gallates crystallize in the enantiomorphic space groups P 3 1 21 and P 3 2 21 , chirality being imparted by helical motifs in the structure. Ni(C 7O 5H 4)⋅2H 2O: a = 8.824 ( 2 ) Å , c = 10.644 ( 2 ) Å ; Mn(C 7O 5H 4)⋅2H 2O: a = 9.063 ( 2 ) Å , c = 10.947 ( 2 ) Å ; Co(C 7O 5H 4)⋅2H 2O: a = 8.910 ( 2 ) Å , c = 10.887 ( 2 ) Å . The Co(II) and Ni(II) gallates exhibit antiferromagnetic behavior, with T N = 43 and 19 K, respectively, while Mn(II) gallate is paramagnetic down to 5 K. High-temperature X-ray powder diffraction indicates that crystallinity is lost near 200 °C in all of the compounds. Decarboxylation of the gallate moieties is believed to facilitate this thermal decomposition.
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