Pnictogen complexes between nitryl derivatives (NO2X, X = CN, F, Cl, Br, NO2, OH, CCH, and C2H3) and molecules acting as Lewis bases (H2O, H3N, CO, HCN, HNC and HCCH) have been obtained at the MP2/aug-cc-pVTZ computational level. A total of 53 minima have been located. Their energy, geometry, DFT-SAPT energy terms, electronic properties (NBO, AIM, ELF, and NCI) and NMR shieldings have been calculated and analyzed. Finally, a search in the CSD database has been carried out, showing a large number of similar interactions in crystallographic structures.
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http://dx.doi.org/10.1039/c3cp52312h | DOI Listing |
Chimia (Aarau)
February 2024
Department für Chemie, Biochemie und Pharmazie, University of Bern, Bern, CH-3012 Bern.
Nitro compounds play a crucial role in academia and industries, serving as building blocks for the synthesis of drugs, agrochemicals, and materials. Nitration, a fundamental process in organic synthesis, has undergone significant evolution since the 19th century. While electrophilic nitration dominates historically, recent decades have seen a focus on new reagents and their reactivity modes for achieving mild and robust synthesis of nitro compounds.
View Article and Find Full Text PDFChemphyschem
April 2023
Laboratorio de Estructura Molecular y Propiedades, Instituto de Química Básica y Aplicada del Nordeste Argentino IQUIBA-NEA (UNNE-CONICET), Avenida Libertad 5460, 3400), Corrientes, Argentina.
The use of real space functions and molecular graphs has pushed some chemists to wonder: Are interactions between negatively charged oxygen atoms possible? In this contribution we analyze whether there is a real interaction between oxygen atoms in nitryl halide dimers (XNO ) (X=F, Cl, Br and I) and in tetranitromethane and derivatives. Based on ab-initio and density functional theories (DFT) methods, we show these complexes are weakly stabilized. Energy decomposition analyses based on local molecular orbitals (LMOEDA) and interacting quantum atoms (IQA) reveal both dispersion and exchange play a crucial role in the stabilization of these complexes.
View Article and Find Full Text PDFJ Phys Chem A
October 2022
School of Chemistry, University of Leeds, Leeds, LS2 9JT, U.K.
A master equation (ME) analysis of available experimental data has been carried out on the reaction HO + NO + M ⇋ HONO + M (1a)/(-1a). The analysis, based on the ME code MESMER, uses both the association and dissociation kinetic data from the literature, and provides improved thermochemistry on reaction 1a. Our preferred model assigns two low-frequency vibrations of HONO as hindered rotors and couples these to the external rotations.
View Article and Find Full Text PDFMolecules
March 2022
Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275, Beijing 102413, China.
J Phys Chem A
August 2020
Department of Chemistry, University of Hawaii, Honolulu, Hawaii 96822, United States.
Energetic materials such as 1,3,5-trinitro-1,3,5-triazinane (RDX) are known to photodissociate when exposed to UV light. However, the fundamental photochemical process(es) that initiate the decomposition of RDX is (are) still debatable. In this study we investigate the photodissociation of solid-phase RDX at four distinct UV wavelengths (254 nm (4.
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