Zobrazeno 1 - 10
of 29
pro vyhledávání: '"R. H. De Almeida Santos"'
Autor:
Rommel B. Viana, R. H. De Almeida Santos, Denise Gilmour, Alan R. Kennedy, Rodolfo Moreno-Fuquen
Publikováno v:
Acta Crystallographica Section E, Vol 65, Iss 12, Pp o3044-o3045 (2009)
In the title salt, C3H5N2+·C7H6NO2−, the carboxylate group of the 4-aminobenzoate anion forms a dihedral angle of 13.23 (17)° with respect to the benzene ring. There are N—H...O hydrogen-bonding interactions between the anion and cation, and we
Externí odkaz:
https://doaj.org/article/43162ffd3c4d46be912180f393957de2
Autor:
Rodolfo Moreno-Fuquen, Leidy J. Valencia, Alan R. Kennedy, Denise Gilmour, R. H. De Almeida Santos
Publikováno v:
Acta Crystallographica Section E, Vol 65, Iss 11, Pp o2614-o2614 (2009)
The title compound, C15H14O2, was obtained by Friedel–Crafts acylation between 2,5-dimethylphenol and benzoyl chloride in the presence of aluminium chloride as a catalyst. The dihedral angle between the benzene rings is 61.95 (4)°. In the crystal,
Externí odkaz:
https://doaj.org/article/2dc1db15e9df4900a5f6b2e5f8dacc02
Autor:
C. C. Silva, Cláudio Nahum Alves, A. B. F. da Silva, Jerônimo Lameira, A. S. Santos, Lourivaldo S. Santos, Josefa Ioneide França de Souza, R. H. De Almeida Santos
Publikováno v:
Journal of Molecular Structure: THEOCHEM. 862:16-20
The structure of 7,4′-dimethoxy-3′-acetylflavone (tithonin-Ac) has been determined by X-ray diffraction and its geometry is compared with optimized geometrical parameters obtained by means of density functional theory at the B3LYP/6-311++G(d,p) l
Autor:
C. A. Meriles, Javier Ellena, A.H. Brunetti, Y. P. Mascarenhas, M. T. do P. Gambardella, R. H. De Almeida Santos
Publikováno v:
Journal of Molecular Structure. 513:245-250
1-Cl-4-Br-benzene, ClBrC6H4, Mr=191.4, P21/c, a=4.0238(6), b=5.8034(10), c=15.083(2), β=112.23(1)°, V=326.03 A3, Z=2, Dx=1.950 g cm−3, λ(Mo Kα)=0.71073 A, μ=6.594 mm−1, F(000)=184, T=220 K, final R=0.046 for 980 observed reflections. 1-Cl-4-
Publikováno v:
ChemInform. 24
C20HDoOD.CH40 , Mr = 350.50, ortho- rhombic, P212~21, a = 7.407 (2), b = 14.442 (3), c = 17.696 (3)/~, V= 1893 (1) ,A, 3, Z = 4, Din(flota- tion) = 1.20 g cm- 3, Dx = 1.230 g cm- 3, A(Cu Ka) = 1.54056 ,~, ~ = 6.3 cm- ~, F(000) = 768, T = 298 (1)K, fi
Publikováno v:
Journal of Crystallographic and Spectroscopic Research. 22:201-204
The title complex (C6H5NO3·C5H4N2O3,M r =279.21) crystallizes in the orthorhombic space groupPna21 witha=18.862(2),b=5.876(1),c=10.803(2) A,V=1197.3(6) A3,D c =1.549 g cm−3 forZ=4,F(000)=576, λ(MoKα)=0.71073 A,μ=0.84 mm−1,T=297 K. The structu
Autor:
Denise Gilmour, Leidy J. Valencia, Rodolfo Moreno-Fuquen, Alan R. Kennedy, R. H. De Almeida Santos
Publikováno v:
Acta Crystallographica Section E, Vol 65, Iss 11, Pp o2614-o2614 (2009)
Acta Crystallographica Section E: Structure Reports
Acta Crystallographica Section E: Structure Reports
The title compound, C15H14O2, was obtained by Friedel–Crafts acylation between 2,5-dimethylphenol and benzoyl chloride in the presence of aluminium chloride as a catalyst. The dihedral angle between the benzene rings is 61.95 (4)°. In the crystal,
Publikováno v:
Acta Crystallographica Section C Crystal Structure Communications. 47:2388-2391
Publikováno v:
Acta Crystallographica Section C Crystal Structure Communications. 54:513-515
In the title hydrogen-bonded complex, C 5 H 5 NO.C 6 H 5 -NO 3 , the two components are linked by an O-H...O hydrogen bond between the phenol hydroxyl group and the N-oxide O atom [O...O 2.553(2) A]. The interplanar angle between the aromatic rings i
Publikováno v:
Acta Crystallographica Section C Crystal Structure Communications. 54:517-519
The structure analysis of the title molecular complex, C 7 H 7 NO 2 .C 6 H 6 N 2 O 3 , forms part of an ongoing study of the design of non-centrosymmetric systems based on 3-methyl-4-nitropyridine N-oxide. The title complex is held together by a hydr