The crystal structure of Sr(OD)(2) has been determined from a Reitveld refinement of time-of-flight neutron diffraction data, and the deuterium atom positions have been determined for the first time. The structure is orthorhombic: Pnma, a = 9.8269(5) Angstrom, b = 3.9051(2) Angstrom, c = 6.0733(3) Angstrom, V = 233.06 Angstrom(3), D-x = 3.466 g cm(-3) R(wp) = 3.9346, R(p) = 2.95%, reduced chi(2) = 4.774 for 81 variables. Although the data were collected at 12 K, the H atoms have large thermal parameters suggesting the possibility of some disorder. Relationships of the structure to the structures of YOOH, SrBr2, SrI2, and SrBr2 . H2O are discussed. (C) 1995 Academic Press, Inc.
Infrared Spectra of the Group 2 Metal Dihydroxide Molecules
作者:Lester Andrews、Xuefeng Wang
DOI:10.1021/ic0483794
日期:2005.1.1
Group 2 metal atoms (Mg, Ca, Sr, and Ba) react on ultraviolet photoexcitation with O(2), H(2) mixtures in solid argon at 10 K to produce new absorptions in the O-H and O-M-O stretching regions. The effect of detailed isotopic substitution on these two absorptions identifies the M(OH)(2) molecules. The stepwise decrease in the O-H stretching modes in this chemical family demonstrates an increase in