title: Photochemical Reaction of OCSe with ClF in Argon Matrix: A Light-Driven Formation of XC(O)SeY (X, Y = F or Cl) Species.
abstract: The photochemistry of OCSe with ClF trapped together in argon matrices at cryogenic temperatures has been explored and the first interhalogen representatives of the elusive XC(O)SeY family, namely syn-ClC(O)SeF, anti-ClC(O)SeF, syn-FC(O)SeCl, and anti-FC(O)SeCl, as well as the hitherto triatomic species ClSeF complexed by a CO molecule, were obtained. Both ClC(O)SeF conformers appear to be produced independently by photolysis of the respective precursors; while formation of both FC(O)SeCl structures is ruled by the presence of an angular molecular complex OCSe···Cl-F formed prior to photolysis. This latter photochemical pathway seems to favor the formation of the less stable anti-FC(O)SeCl structure instead of the more stable syn- one. With the aid of quantum chemical calculations, using ab initio, DFT, TDDFT, and CASSCF methods, the mechanism for this photochemical reaction is rationalized both in terms of radical processes as well as a photoinduced electron transfer occurring into the OCSe···Cl-F complex. Also a singlet-triplet conical intersection between anti and syn rotamers of the FC(O)SeCl molecule is theoretically explored.
authors.affiliation: CEQUINOR (UNLP, CCT-CONICET La Plata). Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata . Boulevard 120 No. 1465, CC 962, La Plata (CP 1900), Argentina.|Laboratorio de Química Teórica y Computacional, Grupo Química-Física Molecular y Modelamiento Computacional (QUIMOL), Facultad de Ciencias, Universidad Pedagógica y Tecnológica de Colombia (UPTC) , Avenida Central del Norte, Tunja, Boyacá, Colombia.
authors.forename: Jovanny A
authors.identifier: http://orcid.org/0000-0002-6654-1315
authors.initials: JA
authors.lastname: Gómez Castaño
authors.affiliation: CEQUINOR (UNLP, CCT-CONICET La Plata). Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata . Boulevard 120 No. 1465, CC 962, La Plata (CP 1900), Argentina.
authors.forename: Rosana M
authors.initials: RM
authors.lastname: Romano
authors.affiliation: CEQUINOR (UNLP, CCT-CONICET La Plata). Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata . Boulevard 120 No. 1465, CC 962, La Plata (CP 1900), Argentina.
authors.forename: Carlos O
authors.initials: CO
authors.lastname: Della Védova
authors.affiliation: Anorganische Chemie, Bergische Universität Wuppertal , Gaußstraße 20, D-42097 Wuppertal, Germany.
authors.forename: Helge
authors.initials: H
authors.lastname: Willner