Abstract
An organic-inorganic polymer of [{Pr(DMF) 6 }{Pr(DMF) 7 }(P 2 W 18 O 62 )] n has been synthesized in acetonitrile-water (5︰2, volume ratio) mixed solvent. Single-crystal X-ray structural analysis indicates that the title compound crystallizes in a monoclinic lattice, P2 1 /C, with a = 1.8574(4), b = 2.3907(5), c = 2.4222(5) nm, β = 99.48(3)°, Z = 4, V = 10.609(4) nm 3 , D c = 3.501 Mg/m 3 , F (000) = 9972, R 1 = 0.0654 and wR 2 = 0.1098. The result of crystal structure analysis reveals that Pr 3+ (1) complex ion is eight-coordinated with a distorted bicapped trigonal prismatic environment, which is combined with the heteropolyanion by terminal oxygen atom, whereas Pr 3+ (2) complex ion is also eight-coordinated with a distorted square antiprismatic environment, which is linked to the heteropolyanion by terminal oxygen atom. Adjacent structure units of [{Pr(DMF) 6 }{Pr(DMF) 7 }(P 2 W 18 O 62 )] are bridged through W-O-Pr1-O-W links to form an unprecedented one-dimensional zigzag linear chain by alternate polyanions and cationic units in the polymer. Thermal analysis reveals that the framework of the title polyanion decomposes at 613.8℃.
Published Version
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