ReI(CO)3 complexes with diimine ligands synthesized in situ

Producción CientíficaThis work covers the coupling reactions of monodentate ligands coordinated to the ‘‘ReI(CO)3” moiety to afford in situ new bidentate diimine ligands. Similar reactions leading to tridentate ligands are also included. The reactions reviewed present evident advantages respect to the usual synthetic methods of these ligands. Besides, choosing the appropriate substituents allows an easy tuning of the properties of the final complexes. Following an approximate chronological order, the formation of bidentate ligands by C-N coupling from a coordinated carbonyl group, from diiminoisoindoline, and the formation of amidino ligands from nitriles are reviewed first. This is followed by the formation of bidentate ligands by C-C coupling, and finally by the formation of tridentate ligands, either by C-C coupling, by B-N coupling, or by using ‘‘click” reactions

Carta de Fernando Villafañe

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Fernando Villafañe a Juan Facundo Quiroga

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Identification and quantification of cell gas evolution in rigid polyurethane foams by novel GCMS methodology

Producción CientíficaThis paper presents a new methodology based on gas chromatography-mass spectrometry (GCMS) in order to separate and quantify the gases presented inside the cells of rigid polyurethane (RPU) foams. To demonstrate this novel methodology, the gas composition along more than three years of aging is herein determined for two samples: a reference foam and foam with 1.5 wt% of talc. The GCMS method was applied, on one hand, for the accurate determination of C5H10 and CO2 cell gases used as blowing agents and, on the other hand, for N2 and O2 air gases that diffuse rapidly from the surrounding environment into foam cells. GCMS results showed that CO2 leaves foam after 2.5 month (from 21% to 0.03% for reference foam and from 17% to 0.03% for foam with 1.5% talc). C5H10 deviates during 3.5 months (from 28% up to 39% for reference foam and from 29% up to 36% for foam with talc), then it starts to leave the foam and after 3.5 year its content is 13% for reference and 10% for foam with talc. Air diffuses inside the cells faster for one year (from 51% up to 79% for reference and from 54% up to 81% for foam with talc) and then more slowly for 3.5 years (reaching 86% for reference and 90% for foam with talc). Thus, the fast and simple presented methodology provides valuable information to understand the long-term thermal conductivity of the RPU foams.Ministerio de Economía, Industria y Competitividad - Fondo Europeo de Desarrollo Regional (grants MAT2015-69234-R and RTC-2016-5285-5)Junta de Castilla y Leon (grant VA275P18)Agencia austriaca para la promoción de la investigación (grant 850697

La Plata, con nueva sinergia

La UNLP lleva realizadas 185 intervenciones, entre restauraciones y obras nuevas. Detalles del plan estratégico y la concepción del espacio público.Universidad Nacional de La Plata (UNLP

La Plata, con nueva sinergia

La UNLP lleva realizadas 185 intervenciones, entre restauraciones y obras nuevas. Detalles del plan estratégico y la concepción del espacio público.Universidad Nacional de La Plata (UNLP