3682-35-7Relevant articles and documents
Catalytic trimerization of 2- and 4-cyanopyridine isomers to the triazine derivatives in presence of magnesium phthalocyanine
Janczak, Jan,?led?, Ma?gorzata,Kubiak, Ryszard
, p. 71 - 79 (2003)
The crystals of 2,4,6-tris(2-pyridyl)-1,3,5-triazine and 2,4,6-tris(4-pyridyl)-1,3,5-triazine isomers have been obtained by a catalytic trimerization of 2- and 4-cyanopyridine in presence of magnesium phthalocyanine. For the 2,4,6-tris(2-pyridyl)-1,3,5-triazine isomer there are two possible conformations that differ in the positions of the N atoms in pyridine rings in relation to the triazine ring. These conformations differ by ~11.30 kJ mol-1 as shown by the molecular orbital calculations. The 2,4,6-tris(2-pyridyl)-1,3,5-triazine crystallises in the centrosymmetric space group of the triclinic system, while the 2,4,6-tris(4-pyridyl)-1,3,5-triazine isomer crystallises in the C2/c space group of monoclinic system. The 2,4,6-tris(2-pyridyl)-1,3,5-triazine molecule is non-planar in the crystal, due to the steric effect of lone-pair electron at the N atom in both pyridine and triazine rings is non-planar. The repulsive interaction between the lone-pair electron is the reason for the rotation of the pyridine rings along the C-C bonds. The pyridine rings in the 2,4,6-tris(4-pyridyl)-1,3,5-triazine molecule are not coplanar with the central triazine ring. The arrangement of molecules in both crystals is mainly determined by the π-π intermolecular interactions. The X-ray geometry of both molecules in the solid-state is compared with the gas-phase geometry obtained by the ab initio molecular orbital calculations.
N-TYPE SEMICONDUCTOR, AND ORGANIC PHOTOELECTRIC DEVICE, IMAGE SENSOR, AND ELECTRONIC DEVICE INCLUDING THE SAME
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Paragraph 0249-0251, (2021/05/14)
Disclosed are an n-type semiconductor including compound represented by Chemical Formula 1 or Chemical Formula 2, an image sensor, and an electronic device. In Chemical Formula 1 and Chemical Formula 2, each substituent is as defined in the detailed description.
Ruthenium complexes of easily accessible tridentate ligands based on the 2-aryl-4,6-bis(2-pyridyl)-s-triazine motif: Absorption spectra, luminescence properties, and redox behavior
Polson, Matthew I. J.,Medlycott, Elaine A.,Hanan, Garry S.,Mikelsons, Larisa,Taylor, Nick J.,Watanabe, Masashi,Tanaka, Yasutaka,Loiseau, Frederique,Passalacqua, Rosalba,Campagna, Sebastiano
, p. 3640 - 3648 (2007/10/03)
A family of tridendate ligands 1a-e, based on the 2-aryl-4,6-di(2-pyridyl)- s-triazine motif, was prepared along with their hetero- and homoleptic Ru II complexes 2a-e ([Ru(tpy)(1a-e)]2+; tpy = 2,2′:6′,2″-ter-pyridine) and 3a-e ([(Ru(1a-e) 2]2+), respectively. The ligands and their complexes were characterized by 1H NMR spectroscopy, ES-MS, and elemental analysis. Single-crystal X-ray analysis of 2a and 2e demonstrated that the triazine core is nearly coplanar with the non-coordinating ring, with dihedral angles of 1.2 and 18.6°, respectively. The redox behavior and electronic absorption and luminescence properties (both at room temperature in liquid acetonitrile and at 77 K in butyronitrile rigid matrix) were investigated. Each species undergoes one oxidation process centered on the metal ion, and several (three for 2a-e and four for 3a-e) reduction processes centered on the ligand orbitals. All compounds exhibit intense absorption bands in the UV region, assigned to spin-allowed ligand-centered (LC) transitions, and moderately intense spin-allowed metal-to-ligand charge-transfer (MLCT) absorption bands in the visible region. The compounds exhibit relatively intense emissions, originating from triplet MLCT levels, both at 77 K and at room temperature. The incorporation of triazine rings and the near planarity of the noncoordinating ring increase the luminescence life-times of the complexes by lowering the energy of the 3MLCT state and creating a large energy gap to the dd state.