Newsletter

search results

results of search on CRYSTALLOGRAPHY JOURNALS ONLINE

77 citations found for Abboud, K.

Search for Abboud, K. in the World Directory of Crystallographers

Select bibliographic records for downloading using the checkboxes or select all button

Results 1 to 20, sorted by name:


Download citation
Download citation


Download citation
Download citation

link to html
In the structure of bis({N-[di­methyl(1[eta]5-2,3,4,6-tetra­methyl­in­den­yl)­silyl]­cyclo­hexyl­amido-1[kappa]N}(methyl-3[kappa]C)-di-[mu]3-methyl­ene-1:2:3[kappa]3C;1:3:3'[kappa]3C-tris(pentafluorophenyl-2[kappa]C)titanium) benzene disolvate, [Me2Si([eta]5-2,3,4,6-Me4C9H2)(C6H11N)]Ti[([mu]3-CH2)Al(C6F5)3][AlMe([mu]3-CH2)]2 or [Ti2(C21H7AlF15)2(C21H31NSi)2]·2C6D6, the dimer is located on an inversion center, and the two Ti centers are linked by double Ti([mu]3-CH2)Al(C6F5)3AlMe([mu]3-CH2) heterocycles. The electron-deficient Ti centers are further stabilized by two [alpha]-agostic interactions between Ti and one H atom of each bridging methyl­ene group.

Download citation
Download citation


Download citation
Download citation

link to html
The crystal structures of the title compounds, 2,5-diethoxy-1,4-bis(3,4-ethylenedioxy-2-thienyl)benzene, C22H22O6S2, (I), and its one-third tetrahydrofuran (THF) solvate, C22H22O6S2.1/3C4H8O, (II), were studied to determine the relative geometry of the benzene and thienyl rings. The dihedral angles between the benzene and thienyl rings are 6.04 (9)° and 2.0 (1)° in (I) and (II), respectively, compared with 27.5 (2)° in the unsubstituted analog 1,4-bis(3,4-ethylenedioxy-2-thienyl)benzene. The benzene and thienyl rings are more distorted in the title structures compared with the unsubstitued analog.

Download citation
Download citation


Download citation
Download citation


Download citation
Download citation


Download citation
Download citation

link to html
In the title compound, the metal center has a distorted pentagonal-bipyramidal geometry, with angles in the pentagonal plane ranging from 70.5(1) to 149.2(1)°. The W-C bond lengths are in the range 1.991(3)-1.999(3)Å, and the W-N bond lengths are in the range 2.149(2)-2.215(3)Å. The six phenyl rings have average C-C bond lengths ranging from 1.382(5) to 1.390(5)Å.

Download citation
Download citation


Download citation
Download citation

link to html
The approximately planar molecule of the title compound, C14H14N3O2+.Cl-.2H2O, is in an E conformation with respect to the C=N bond, with a C-C=N-N torsion angle of 179.5 (1)°. The maximum possible number of hydrogen bonds are formed in the crystal. The pyridinium H atom forms a hydrogen bond to a water molecule which is hydrogen bonded to the carbonyl O atom, requiring the pyridine ring to be rotated 180° compared to the unprotonated 2-formylpyridine analog. There is an intramolecular hydrogen bond involving the NH group on the chain and the hydroxyl O atom on the phenyl ring which, in turn, is hydrogen bonded to a Cl- ion. Finally, a water molecule and chloride ion form a hydrogen-bonded square around a center of symmetry with O...Cl distances of 3.199 (2) and 3.206 (2) Å, and endocyclic angles of 91.17 (4)° and 88.83 (4)° at the O and Cl atoms, respectively.


Download citation
Download citation

link to html
The title compound, C51H50N2O20, is an intermediate in the synthesis of a substrate to be used in enzymological studies of lysozyme. It was synthesized via a trichloroacetimidate coupling of 2,3,6-tri-O-acetyl-2-deoxy-2-N-phthalimido-1-trichloroacetimidate-[beta]-D-glucopyranoside and p-nitrophenyl 2,3-di-O-benzoyl-6-O-pivaloyl -[beta]-D-glucopyranoside. Both glucose rings adopt chair conformations with one described as 1C4 and the other as 5C3. Atoms C1 and C4 are at distances of 0.727 (4) and -0.652 (4) Å, respectively, and O5' and C3' are at distances of 0.713 (4) and -0.555 (5) Å, respectively, from their chair planes.

Download citation
Download citation


Download citation
Download citation


Download citation
Download citation

link to html
The structure of aqua(nitrato-O){pyridine-2,6-diylbis[N-(1-ethylideneamino)benzamide]-O1,N2,N1,N5,O2}cobalt(II) nitrate, [Co(NO3)(C23H21N5O2)(H2O)]NO3, was redetermined at 173 K. There are only small differences between the bond distances in the cation at 173 K relative to the room-temperature determination reported previously. The average difference is 0.006 Å for all 45 bond distances and only 0.004 Å for 27 bonds if the two phenyl rings and two nitrate ions, which have large thermal motions, are excluded. The CoII atom is in the center of a pentagonal bipyramid consisting of the pentadentate ligand, with a water molecule and monodentate nitrate ligand in the axial positions.

Download citation
Download citation


Download citation
Download citation

link to html
The titanium metal center in the title compound, [Ti(C19H27NSi)(C16H14)], is coordinated in a distorted tetrahedral geom­etry by a [eta]5-indenyl ligand, a di­methyl­silyl-bridged N-cyclo­butyl­amido ligand and an s-cis-[eta]4-1,4-di­phenyl-1,3-buta­diene ligand in a `prone' [pi]-fashion, revealing a formal divalent Ti center.

Download citation
Download citation


Download citation
Download citation


Download citation
Download citation

link to html
The crystal structure of the title compound, C12H19NO6, was determined in order to ascertain its relative configuration. It was synthesized by the stereospecific reduction of the novel oxime derived from 5-O-acetyl-1,2-isopropylidene-3-oxo-[alpha]-D-ribofuranose and comprises two cis-fused heterocyclic five-membered rings, furanose and dioxolane, which adopt envelope conformations.

Follow IUCr Journals
Sign up for e-alerts
Follow IUCr on Twitter
Follow us on facebook
Sign up for RSS feeds