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Laurionite-type M(OH)X (MBa, Pb; XCl, Br, I) and Sr(OH)I. An IR and Raman spectroscopic study

✍ Scribed by H.D Lutz; K Beckenkamp; St Peter

Book ID: 103908089
Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 658 KB
Volume: 51
Category: Article
ISSN: 1386-1425
DOI: 10.1016/0584-8539(94)01292-o

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✦ Synopsis

Abstraet--IR, Raman and single-crystal Raman spectra of laurionite-type Sr(OH)I, Ba(OH)CI, Ba(OH)Br, Ba(OH)I, Pb(OH)CI, Pb(OH)Br and Pb(OH)I, and of deuterated specimens and Ba(OH)Cll_xBrx solid solutions recorded at 90-520 K are presented and assigned to OH (OD) stretching, librational and translational modes. The main results obtained are (i) unusually large structural H/D isotope effects of Ba(OH)Ci due to Landau-type isostructural reorientation of OH-ions and (ii) the very different nature and strengths of the hydrogen bonds formed. Thus, the strengths of the partly linear (Ba(OH)CI), partly multifurcated hydrogen bonds range as Pb(OH)I (VoH: 3497 cm-I)> Pb(OH)Br > Pb(OH)CI > Sr(OH)I (3591 cm-1), as shown by the red-shift of the OH stretches and the blue-shift of the OH librations. In the cases of Ba(OH)Br (3605 cm-l) and Ba(OH)I (3590cm-~), hydrogen bonding is negligible. The stronger hydrogen bonds formed in the lead compounds are caused by the greater synergetic effect of Pb 2+ ions compared to those of Sr 2+ and Ba 2+.

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