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Herein, we have investigated 1:1 complexes of 2-fluorothiophenol (2-FTP) with methanol (MeOH) and ethanol (EtOH) in the gas phase to examine the physical characteristics and strength of the S\u2013H\u22efO hydrogen bond. Structures, conformations, and the strength of the S\u2013H\u22efO interaction are investigated by measuring the electronic and Infrared (IR) spectra of the two complexes employing resonant two-photon ionization, UV\u2013UV hole-burning, and IR\u2013UV double resonance spectroscopic techniques combined with quantum chemical calculations. Three conformers of 2-FTP\u22efMeOH and two conformers of 2-FTP\u22efEtOH have been detected in the experiment. A comparison of the IR spectra obtained from the experiment with those of the low-energy conformers of 2-FTP\u22efMeOH and 2-FTP\u22efEtOH predicted from the theory confirms that all the observed conformers of the two complexes are primarily S\u2013H\u22efO hydrogen bonded. The IR red-shifts found in the S\u2013H stretching frequencies in 2-FTP\u22efMeOH and 2-FTP\u22efEtOH concerning that in 2-FTP are \u223c76 and \u223c88\u00a0cm\u22121, respectively, which are much larger than that was reported earlier in the 2-FTP\u22efH2O complex (30\u00a0cm\u22121). The strength and physical nature of different noncovalent interactions, including the S\u2013H\u22efO hydrogen bond existing in the complexes, are further analyzed using natural bond orbital analysis, quantum theory of atoms in molecules, and localized molecular orbital-energy decomposition analysis. The current investigation reveals that the S\u2013H\u22efO hydrogen bond can be strengthened by judicial choices of the hydrogen bond acceptors of higher proton affinities.<\/jats:p>","DOI":"10.1063\/5.0208086","type":"journal-article","created":{"date-parts":[[2024,6,10]],"date-time":"2024-06-10T06:55:42Z","timestamp":1718002542000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":5,"title":["Modulation of the strength of weak S\u2013H\u22efO hydrogen-bond: Spectroscopic study of the complexes of 2-flurothiophenol with methanol and ethanol"],"prefix":"10.1063","volume":"160","author":[{"given":"Surajit","family":"Metya","sequence":"first","affiliation":[{"name":"Department of Chemistry, Indian Institute of Science Education and Research Pune 1 , Dr. Homi Bhabha Road, Pashan, Pune 411008, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-6729-8243","authenticated-orcid":false,"given":"Supravat","family":"Roy","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Indian Institute of Science Education and Research Pune 1 , Dr. Homi Bhabha Road, Pashan, Pune 411008, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-2307-3804","authenticated-orcid":false,"given":"Sourav","family":"Mandal","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Indian Institute of Science Education and Research Pune 1 , Dr. Homi Bhabha Road, Pashan, Pune 411008, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5384-9241","authenticated-orcid":false,"given":"Qian-Rui","family":"Huang","sequence":"additional","affiliation":[{"name":"Institute of Atomic and Molecular Sciences, Academia Sinica 2 , Taipei, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0550-0181","authenticated-orcid":false,"given":"Jer-Lai","family":"Kuo","sequence":"additional","affiliation":[{"name":"Institute of Atomic and Molecular Sciences, Academia Sinica 2 , Taipei, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2124-0631","authenticated-orcid":false,"given":"Aloke","family":"Das","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Indian Institute of Science Education and Research Pune 1 , Dr. Homi Bhabha Road, Pashan, Pune 411008, India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2024,6,10]]},"reference":[{"key":"2024061010553532900_c1","doi-asserted-by":"publisher","first-page":"1419","DOI":"10.1021\/ja01452a015","article-title":"Polarity and ionization from the standpoint of the Lewis theory of valence","volume":"42","year":"1920","journal-title":"J.\u00a0Am. 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