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Spectroscopic and computational examination of a homologous series of rhodium(I) pybox carbonyl complexes has revealed a correlation between the conformation of the flanking aryl-substituted oxazoline donors and the carbonyl stretching frequency. This relationship is also observed experimentally for octahedral rhodium(III) and ruthenium(II) variants and cannot be explained through the classical, Dewar-Chatt-Duncanson, interpretation of metal-carbonyl bonding. Instead, these findings are reconciled by local changes in the magnitude of the electric field that is projected along the metal-carbonyl vector: the internal Stark effect.
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http://dx.doi.org/10.1002/chem.202202283 | DOI Listing |
ACS Earth Space Chem
August 2025
Laboratory for Astrophysics, Leiden Observatory, Leiden University, P.O. Box 9513, Leiden 2300 RA, The Netherlands.
Carbonyl sulfide (OCS) is currently the only securely detected sulfur-bearing species in interstellar ices, making it an ideal window into solid-state sulfur chemistry in dense star-forming regions. Previous astronomical observations of the OCS asymmetric stretching mode (ν) at ∼2040 cm (∼4.9 μm) demonstrate that interstellar OCS may be embedded in CHOH-rich ices, indicating that OCS likely forms in the coldest, densest parts of star-forming regions where catastrophic CO freezeout occurs.
View Article and Find Full Text PDFPhys Chem Chem Phys
August 2025
Department of Chemistry, Diamond Harbour Women's University, Sarisha, West Bengal, India.
Complexes of (E)-ethylcinnamate (EC), a widely prevalent plant secondary metabolite, with two hydrogen bond donors phenol (Ph) and thiophenol (TPh), have been studied under ambient conditions in solution. The former, characterized by multiple electron-rich centers, offers multiple accessible sites to which the phenolic O-H donor or the thiophenolic S-H donor can bind. Experimental shifts in donor stretching frequencies as well as in signature vibrations of the acceptor EC molecule are interpreted in combination with quantum chemical calculations to assign the binding preferences of both Ph and TPh.
View Article and Find Full Text PDFBioresour Technol
December 2025
Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, United States.
Fungi are emerging as a promising solution for bioremediation. Several fungi have been identified to degrade polyester, but the specific molecular mechanisms involved remain poorly understood. In this study, we screened for polyester-degrading fungus, characterised its ability to depolymerise both polyurethane (PU) and polyethylene terephthalate (PET), and employed a multi-omics approach to identify key proteins involved in PU and PET hydrolysis.
View Article and Find Full Text PDFPolymers (Basel)
August 2025
Faculty of Silviculture and Forest Engineering, Transilvania University of Brasov, 1 Sirul Bethoven, 500123 Brasov, Romania.
Spruce wood is a natural polymeric material, consisting of cellulose, lignin, hemicelluloses and other secondary components, which gives it a unique chemical footprint and architecture. Varnishes are used in musical instruments to protect the wood against humidity variations, wood being a hygroscopic material, but also to protect the wood from dirt. The varnishes used both to protect the wood from resonance and to ensure a special aesthetic appearance are either polymeric varnishes (nitrocellulose, oil-based) or volatile solvents (spirit).
View Article and Find Full Text PDFMolecules
July 2025
Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, Curitiba 81531-980, PR, Brazil.
The valence-shell electronic state spectroscopy of β-butyrolactone (CHCHCHCO) is comprehensively investigated by employing experimental and theoretical methods. We report a novel vacuum ultraviolet (VUV) absorption spectrum in the photon wavelength range from 115 to 320 nm (3.9-10.
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