Abstract
The crystal structure of Pr(III) hydroxide perchlorate monohydrate, Pr 2(OH) 3H 2O(ClO 4) 3, has been determined from single-crystal X-ray diffraction data. The unit cell (monoclinic, C2/ c, a=1576.1(4) pm, b=961.8(3) pm, c=1033.2(3) pm, β=119.97(3)°, Z=4, R=0.023, R w=0.022) contains eight Pr 3+ ions in ninefold oxygen coordination. Seven O 2− ions from perchlorate anions and two O 2− ions from hydroxide anions or crystal water form a distorted tricapped trigonal prism surrounding Pr 3+. Two crystallographically and functionally different ClO 4 − anions bridge two Pr 3+ cations to form anionic centrosymmetric dimers with the composition ( [Pr(OH) 3 2 (H 2O) 1 2 (ClO 4) 4] 2) 5− . Further connection via “free” coordination positions of perchlorate oxygen leads to one-dimensional infinite chains which run parallel to [001]. These are stacked in the [010] direction in the fashion of a hexagonal closest packing of rods that are further connected via perchlorate oxygen assisted by (weak) hydrogen bonds to form a three-dimensional network.
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