614 research outputs found
1,1,3-Trimethyl-3-(4-nitrophenyl)indane
In the title compound, C18H19NO2, the five-membered ring of the indane fragment adopts an envelope conformation, with the unsubstituted C atom, acting as the flap atom, deviating by 0.412 (3) Å from the plane through the remaining four atoms. The dihedral angle between the nitrophenyl ring and the indane benzene ring is 72.5 (1)°. The distances from the two O atoms to the plane of the adjacent benzene ring are 0.113 (4) and 0.064 (4) Å
Tetramethyl biphenyl-2,3,3′,4′-tetracarboxylate
The asymmetric unit of the title compound, C20H18O8, contains two molecules with small geometric differences. The dihedral angles between the benzene rings are 62.94 (12) and 59.99 (12)°. The dihedral angles between the carboxylate groups in the 2- and 3-positions are 81.72 (13) and 65.54 (15)°, respectively. However, the dihedral angles between the carboxylate groups in the 3′ and 4′-positions are 67.24 (15) and 59.98 (17)°, respectively
1,3,3-Trimethyl-5-nitro-1-phenylindane
In the title compound, C18H19NO2, the five-membered ring of the indane fragment adopts an envelope conformation with the unsubstituted carbon atom at the flap displaced by 0.412 (3) Å from the plane formed by the other four atoms. The nitro group forms a dihedral angle of 5.3 (2)° with the indane benzene ring while the dihedral angle between the phenyl ring and the indane benzene ring is 76.74 (9)°
2,6,7-Trioxa-1-phosphabicyclo[2.2.2]octan-4-ylmethanol 1-sulfide
The title compound, C5H9O4PS, was synthesized by the reaction of pentaerythritol with thiophosphoryl chloride. In the crystal structure, the three six-membered rings all adopt boat conformations. Molecules form chains along the c axis via intermolecular O—H⋯O hydrogen bonds
1,1,3-Trimethyl-3-phenylindane
In the title compound, C18H20, the five-membered ring of the indane fragment adopts an envelope conformation, with the flap atom deviating by 0.399 (3) Å from the plane of the remaining four atoms. The dihedral angle between the phenyl ring and the indane benzene ring is 79.58 (7)°
Variability of the giant X-ray bump in GRB 121027A and possible origin
The particular giant X-ray bump of GRB 121027A triggered by \emph{Swift} is
quite different from the typical X-ray flares in gamma-ray bursts. There
exhibit four parts of the observed structural variabilities in the rise and
decay phase of the bump. Considering the quality of four parts of the data, we
can only analyze the data from about 5300 s to about 6100 s in the bump using
the stepwise filter correlation method (Gao et al. 2012), and find that the
periodic oscillation may exist, which is confirmed by
the Lomb-Scargle method (Scargle 1982). Furthermore, a jet precession model
(Liu et al. 2010) is proposed to account for such a variability.Comment: 5 pages, 3 figures, accepted for publication in MNRA
2,2′-Dimethyl-4,4′-(sulfonyldi-p-phenylene)dibut-3-yn-2-ol dihydrate
The asymmetric unit of the title compound, C22H22O4S·2H2O, contains one quarter of the organic molecule and one half water molecule, the site symmetries of the S atom and the water O atom being mm2 and m, respectively. The dihedral angle between the benzene rings is 76.27 (11)°. In the crystal structure, intermolecular O—H⋯O hydrogen bonds link the molecules into chains running parallel to the a axis
Bis[4-(3-aminophenoxy)phenyl] ketone
In the molecule of the title compound, C25H20N2O3, the dihedral angles formed by adjacent benzene rings are 66.75 (8), 48.37 (8) and 71.43 (9)°. In the crystal structure, centrosymmetrically related molecules are linked into dimers by intermolecular N—H⋯O hydrogen bonds
- …