{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T02:47:06Z","timestamp":1760150826695,"version":"build-2065373602"},"reference-count":34,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2022,1,27]],"date-time":"2022-01-27T00:00:00Z","timestamp":1643241600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Entropy"],"abstract":"<jats:p>The vapor pressures of six solid 5-X-1,10-phenanthrolines (where X = Cl, CH3, CN, OCH3, NH2, NO2) were determined in suitable temperature ranges by Knudsen Effusion Mass Loss (KEML). From the temperature dependencies of vapor pressure, the molar sublimation enthalpies, \u0394crgHm0(\u27e8T\u27e9), were calculated at the corresponding average \u27e8T\u27e9 of the explored temperature ranges. Since to the best of our knowledge no thermochemical data seem to be available in the literature regarding these compounds, the \u0394crgHm0(\u27e8T\u27e9) values obtained by KEML experiments were adjusted to 298.15 K using a well known empirical procedure reported in the literature. The standard (p0 = 0.1 MPa) molar sublimation enthalpies, \u0394crgHm0(298.15 K), were compared with those determined using a recently proposed solution calorimetry approach, which was validated using a remarkable amount of thermochemical data of molecular compounds. For this purpose, solution enthalpies at infinite dilution of the studied 5-chloro and 5-methylphenantrolines in benzene were measured at 298.15 K. Good agreement was found between the values derived by the two different approaches, and final mean values of \u0394crgHm0(298.15 K) were recommended. Finally, the standard molar entropies and Gibbs energies of sublimation were also derived at T = 298.15 K. The volatilities of the six compounds were found to vary over a range of three orders of magnitude in the explored temperature range. The large difference in volatility was analyzed in the light of enthalpies and entropies of sublimation. The latter was tentatively put in relation to the rotational contribution of the substituent group on the phenanthroline unit.<\/jats:p>","DOI":"10.3390\/e24020192","type":"journal-article","created":{"date-parts":[[2022,1,27]],"date-time":"2022-01-27T21:59:55Z","timestamp":1643320795000},"page":"192","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Sublimation Study of Six 5-Substituted-1,10-Phenanthrolines by Knudsen Effusion Mass Loss and Solution Calorimetry"],"prefix":"10.3390","volume":"24","author":[{"given":"Bruno","family":"Brunetti","sequence":"first","affiliation":[{"name":"Istituto per lo Studio dei Materiali Nanostrutturati, Consiglio Nazionale delle Ricerche, Dipartimento di Chimica, Sapienza Universit\u00e0 di Roma, P.le A. Moro 5, 00185 Rome, Italy"}]},{"given":"Andrea","family":"Ciccioli","sequence":"additional","affiliation":[{"name":"Dipartimento di Chimica, Sapienza Universit\u00e0 di Roma, P.le A. Moro 5, 00185 Rome, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9728-8132","authenticated-orcid":false,"given":"Andrea","family":"Lapi","sequence":"additional","affiliation":[{"name":"Dipartimento di Chimica, Sapienza Universit\u00e0 di Roma, P.le A. Moro 5, 00185 Rome, Italy"},{"name":"Istituto per i Sistemi Biologici (ISB-CNR), Sede Secondaria di Roma-Meccanismi di Reazione, Dipartimento di Chimica, Universit\u00e0 degli Studi di Roma \u201cLa Sapienza\u201d, P.le A. Moro 5, 00185 Rome, Italy"}]},{"given":"Aleksey V.","family":"Buzyurov","sequence":"additional","affiliation":[{"name":"A.M. Butlerov Chemical Institute, Kazan Federal University, Kremlevskaja Str. 18, 420008 Kazan, Russia"}]},{"given":"Ruslan N.","family":"Nagrimanov","sequence":"additional","affiliation":[{"name":"A.M. Butlerov Chemical Institute, Kazan Federal University, Kremlevskaja Str. 18, 420008 Kazan, Russia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8578-6257","authenticated-orcid":false,"given":"Mikhail A.","family":"Varfolomeev","sequence":"additional","affiliation":[{"name":"Department of Petroleum Engineering, Institute of Geology and Petroleum Technologies, Kazan Federal University, Kremlevskaja Str. 18, 420008 Kazan, Russia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7864-4266","authenticated-orcid":false,"given":"Stefano Vecchio","family":"Ciprioti","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze di Base ed Applicate per l\u2019Ingegneria (S.B.A.I.), Sapienza University of Rome, Via del Castro Laurenziano 7, Building RM017, 00161 Rome, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2022,1,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"299","DOI":"10.1039\/cs9942300327","article-title":"1,10-Phenanthroline: A versatile ligand","volume":"23","author":"Sammes","year":"1994","journal-title":"Chem. 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