Raman and infrared spectra of NH₄H₂(IO₃)₃ and KH₂(IO₃)₃

Abstract

Raman and infrared spectra of NH,HZ(I0,), and KH,(I03), were recorded and analysed. The observed splitting!? of the stretching modes of 10, -are due to the distortion of the 10, octahedra. In NH,H,(IO,), , the ammonium ion can rotate freely and the NH,' group forms only weak hydrogen bonds with the oxygen atom. Owing to Fermi resonance, three stretching bands are observed for the OH vibration in both compounds. The hydrogen bonds are slightly shorter in KH,(I03), than in NH,H,(IO,), .

Thermal behaviour and vibrational characterization of MH2(IO3)3 phases (M=K, Rb and NH4)

“…The IR and Raman spectra of the ammonium and potassium compounds were recently published by Santha et al [12]. However, whereas the Raman lines agree with our results, the IR spectra show differences.…”

[M(OH)2]3(IO3)(SeO4)·H2O (M = Ga and In): metal iodate–selenate nonlinear optical materials with a hexagonal tungsten oxide-type topology

“…The precise assignment of peaks at a low frequency (630–400 cm −1 ) is difficult, primarily owing to the overlay between the asymmetric bending ν 4 of Se–O and the symmetric bending ν 2 of I–O in this range (Table S3†). 21,63,64…”

“…The precise assignment of peaks at a low frequency (630-400 cm −1 ) is difficult, primarily owing to the overlay between the asymmetric bending ν 4 of Se-O and the symmetric bending ν 2 of I-O in this range (Table S3 †). 21,63,64 The UV-vis-NIR experiments indicated compounds 1 and 2 have the same band gaps of 3.38 eV, as shown in Fig. S7.…”

A Large Family of Centrosymmetric and Chiral f-Element-Bearing Iodate Selenates Exhibiting Coordination Number and Dimensional Reductions

“…Free SeO 4 2– ion under perfect T d symmetry exhibits the following internal modes: symmetric stretching ν 1 (833 cm –1 ), symmetric bending ν 2 (335 cm –1 ), asymmetric stretching ν 3 (875 cm –1 ), and asymmetric bending ν 4 (432 cm –1 ), respectively, within which ν 3 and ν 4 bands are IR active . The ideal IO 3 2– trigonal pyramid has a C 3 v symmetry consisting of ν 1 (779 cm –1 ), ν 2 (826 cm –1 ), ν 3 (390 cm –1 ), and ν 4 (320 cm –1 ) bands, all of which are infrared active . These bands could split and shift due to correlation field splittings and crystal-field effects within solid-state compounds.…”

“…63 The ideal IO 3 2− trigonal pyramid has a C 3v symmetry consisting of ν 1 (779 cm −1 ), ν 2 (826 cm −1 ), ν 3 (390 cm −1 ), and ν 4 (320 cm −1 ) bands, all of which are infrared active. 64 These bands could split and shift due to correlation field splittings and crystal-field effects within solid-state compounds. Peaks ranging from 850 to 1000 cm −1 could be assigned to ν 3 stretching of Se−O.…”