Weak hydrogen bonds in solid hydroxides and hydrates

Sr(OH)Br, a Metal Hydroxide Halide with Unusual Properties

“…Hence, the strength of H hydrogen bonds at site I exceeds that at site II to a larger extent than in the case of D hydrogen bonds. This means that the di!erence in the strengths of the respective hydrogen bonds is mainly governed by the di!erent zero-point vibrational amplitudes of the librational modes as usually found in the case of weak hydrogen bonds of solid hydroxides (11,14). Thus, in the case of linear hydrogen bonds as at position II, D2Br hydrogen bonds are stronger than H2Br bonds, and in the case of trifurcated bonds as at position I, H2Br bonds are stronger than D2Br bonds (see Fig.…”

Face to face with enemy – analysis of aqua carbonate hydroxide second surface phases in proton conducting perovskite ceramic electrolytic membrane.

“…3600 cm -1 is a fingerprint of isolated, free OH -vibrator [3,5]. In some cases, the doublet can be observed because of different allotropic hydroxides [19][20][21] and/or a corresponding short-range structure. The peaks observed above 3400 cm -1 are assigned to the OH -vibrators interacting with water molecules.…”

“…The IR and Raman signatures of potentially formed (Sr/Ba)(OH) x (CO 3 ) y ,nH 2 O phases are discussed in combination with TGA. Note, we analyse here the secondary phases in their complex mixture form because in such state they are usually detected on the surface of electrolytical membranes; the study of secondary phases in their original forms: (Sr/Ba)O, (Sr/Ba)(OH) 2, (Sr/Ba)(OH) 2 nH 2 O and (Sr/Ba)CO 3 can be found in literature [19,20]. Finally, the TGA and IR results obtained for secondary phases will be compared with the ones of proton conducting perovskite ceramic membranes.…”

Stereochemical Equivalence of PIII-Bonded Hydrogen Atoms and |SeIV Lone Electron Pairs in Sr(H2PO3)2 and Sr(HSeO3)2

“…This gives an explanation for the finding that, despite the much longer SeϪO distances, the cell volume is smaller in the selenate(IV) compound (see Table 1 and 2). Nevertheless, the interlayer hydrogen bond (O23ϪH23···O22) is shorter for Sr(H 2 PO 3 ) 2 , i.e., the oxygen atoms of HPO 2 OH Ϫ are stronger H-bond acceptors than those of SeO 2 OH Ϫ (see also [23,24] ).…”