Poly[[diaquatris[μ4-(p-phenylenedioxy)diacetato]dipraseodymium(III)] dihydrate]

Rong-Hua Zeng, Yong-Cai Qiu, Yue-Peng Cai, Jian-Zhong Wu, Hong Deng
2007 Acta Crystallographica Section E  
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.006 Å; R factor = 0.030; wR factor = 0.073; data-to-parameter ratio = 17.1. The title praseodymium coordination polymer, {[Pr 2 (C 10 H 8 O 6 ) 3 (H 2 O) 2 ]Á2H 2 O} n , was obtained by the hydrothermal reaction of Pr(NO 3 ) 3 with (p-phenylenedioxy)diacetic acid in alkaline aqueous solution. Each Pr III atom is coordinated by nine O atoms, eight from four (p-phenylenedioxy)diacetate ligands and one from a water molecule,
more » ... water molecule, displaying a tricapped trigonal prismatic geometry. There is a centre of symmetry at the mid-point of the PrÁ Á ÁPr vector. The bridging ligands crosslink the metal ions to form a threedimensional network, with channels running along the c axis in which the uncoordinated water molecules are located. The crystal structure is stabilized by intermolecular O-HÁ Á ÁO hydrogen-bonding interactions. Experimental Crystal data [Pr 2 (C 10 H 8 O 6 ) 3 (H 2 O) 2 ]Á2H 2 O M r = 1026.38 Monoclinic, P2 1 =c a = 12.1685 (3) Å b = 16.9339 (4) Å c = 8.9299 (2) Å = 108.956 (1) V = 1740.30 (7) Å 3 Z = 2 Mo K radiation = 2.86 mm À1 T = 293 (2) K 0.18 Â 0.15 Â 0.12 mm Data collection Bruker APEXII area-detector diffractometer Absorption correction: multi-scan (SADABS; Sheldrick, 1996) T min = 0.607, T max = 0.715 14677 measured reflections 4182 independent reflections 3381 reflections with I > 2(I) R int = 0.036
doi:10.1107/s1600536807022519 fatcat:qblsdjqdpvdyvixwyxnnst75qi