Molecular complexes between hydrogen sulphide and water studied by matrix isolation infrared spectroscopy

Importance of water and intramolecular interaction governs substantial blue shift of Csp2–H stretching frequency in complexes between chalcogenoaldehydes and water

“…38 Furthermore, the strength and characteristics of O-H/S, S-H/O/S H-bonds in the systems such as (H 2 O) 2 , (H 2 S) n (n ¼ 2-4), and H 2 O/H 2 S were realized both computationally and experimentally. [39][40][41][42][43][44] It is noteworthy that a large number of unconventional H-bonds have been found, which demonstrates the pivotal role of H-bonds in biomolecular structure, catalysis, etc. Surprisingly, the O-H/Se/Te H-bonds have also been observed experimentally and conrmed by computations.…”

Theoretical Aspects of Nonconventional Hydrogen Bonds in the Complexes of Aldehydes and Hydrogen Chalcogenides

“…Chalcogen group (group VIA) elements, including O, S, Se, and Te, have been considered as either an acceptor proton B or a donor proton A–H. ,− However, knowledge on H-bonds for Se- and Te-contained compounds is hardly addressed, although their importance in biology is undeniable. ,, It has recently been reported that Se- and S-centered H-bonds are as strong as oxygen (O)- and nitrogen (N)-centered conventional H-bonds despite the much smaller electronegativities of sulfur and selenium with respect to oxygen. ,, Studies using a mass selective and conformer-specific high-resolution vibrational spectroscopy along with ab initio calculations at the CCSD­(T) level showed that the direct S, Se H-bonds between two amino acid residues are extensively present in proteins. , One of the first studies on Se–H...O/S/Se H-bonds considered the H 2 Se...HYH complexes with Y = O, S, and Se, but the report has not led to a classification or an explanation of their origin . The stability and characteristics of the O–H ... S and S–H ... O/S bonds in the systems including 2H 2 O, 2H 2 S, (H 2 S) n ( n = 2–4), and H 2 O ... H 2 S were also reported by either theoretical or experimental means. ,,− Mishra and co-workers observed the nonconventional H-bond of O–H...Se bridging amino acid residues in proteins through extensive PDB analysis coupled with gas phase spectroscopy and quantum chemical calculation. They pointed out that the addition of H 2 O molecules to the system significantly affects the strength of the complex.…”

Infrared Spectroscopy of H2S and SH in Rare-Gas Matrixes

“…23 In solid nitrogen, the IR spectra of monomeric H 2 S, reported by different groups are in good agreement with each other. 21,23,24 The IR spectra of (H 2 S) 2 and H 2 S‚‚‚H 2 O complexes have been studied in solid Ar, 21,25 Kr, 21 and N 2 . 24 In solid Ar, (H 2 S) 2 absorbs at 2582 cm -1 , and in the H 2 O‚‚‚HSH complex, the S-H stretching is found at 2587 cm -1 .…”