Correction. Conformations and Crystal Packing. The Crystal and Molecular Structure of trans-Bis(2,4-pentanedionato)dipyridinenickel(II), Ni(AA)2(py)2

1969 ◽  
Vol 8 (12) ◽  
pp. 2821-2821
Author(s):  
R Elder
Keyword(s):  
Molecular Structure ◽  
Crystal And Molecular Structure ◽  
Crystal Packing

The Crystal and Molecular Structure of Charge-Transfer Complex of Azo Dyestuff 5-(4-Chloro-2-nitrophenyl)-azo-6-hydroxy-1-ethyl-3-cyano-4-methyl-2-pyridone with Naphthalene

1993 ◽  
Vol 58 (9) ◽  
pp. 2121-2127 ◽  
Author(s):  
Josef Přikryl ◽  
Bohumil Kratochvíl ◽  
Jan Ondráček ◽  
Jaroslav Maixner ◽  
Jiří Klicnar ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Charge Transfer ◽  
Pyridine Ring ◽  
Charge Transfer Complex ◽  
Crystal And Molecular Structure ◽  
Crystal Packing ◽  
Direct Methods ◽  
Van Der Waals Forces ◽  
Triclinic Space Group ◽  
Π Stacking Interaction

The title charge-transfer complex crystallizes in the ratio of two molecules of azo dyestuff to one molecule of naphthalene. The crystals are triclinic, space group P1, lattice parameters a = 7.953(1), b = 11.608(2), c = 11.717(2) Å, α = 101.89(2), β = 94.27(2), γ = 109.91(2)°, Z = 2. The structure was solved by direct methods and refined anisotropically to R = 0.054 for 1 768 unique observed reflections. Crystal packing is stabilized by van der Waals forces and partly by π-π stacking interaction among naphthalene, phenyl and pyridine ring of pyridon azo dyestuff.

The crystal and molecular structure of π -cyclopentadienyl 1-phenylcyclopentadiene cobalt

1964 ◽  
Vol 279 (1377) ◽  
pp. 191-209 ◽  
Keyword(s):  
Molecular Structure ◽  
Single Crystal ◽  
Least Squares ◽  
Crystal And Molecular Structure ◽  
Crystal Packing ◽  
Three Dimensional ◽  
Phenyl Group ◽  
Spectroscopic Techniques ◽  
Bond Lengths ◽  
Carbon Carbon Bond

π -Cyclopentadienyl 1-phenylcyclopentadiene cobalt crystallizes as orthorhombic needles with a = 29.64 ± 0.04 Å, b = 7.70 ± 0.01 Å, c = 10.68 + 0.02 Å; the space group is Pbca . A three-dimensional single-crystal Fourier and least-squares analysis has converged R to 0.089 for the 815 independent reflexions, σ - and π -bonding from the cyclopentadiene ligand to the cobalt ion is evidenced by the conformation of the ligand together with the detailed carbon-carbon bond lengths (average e. s. d. 0.03 Å). The phenyl group occupies the exo -position rather than the endo -site suggested by spectroscopic techniques. The crystal packing is also discussed.

The crystal and molecular structure of lead(II)bromide-bis-dimethylsulphoxide, PbBr2•2[(CH3)2SO]

1977 ◽  
Vol 55 (5) ◽  
pp. 849-855 ◽  
Author(s):  
Anthony D. Baranyi ◽  
Mario Onyszchuk ◽  
Yvon Le Page ◽  
Gabrielle Donnay
Keyword(s):  
Molecular Structure ◽  
Least Squares ◽  
Title Compound ◽  
Lone Electron Pair ◽  
Electron Pair ◽  
Crystal And Molecular Structure ◽  
Crystal Packing ◽  
The Other ◽  
Full Matrix ◽  
A Cell

The title compound has two PbBr2•2[(CH3)2SO] units, Z = 2, in a cell with a = 11.093(2), b = 12.382(3), c = 4.540(1) Å, belonging to space group Pmmn. The structure was solved by Patterson functions and was refined by full-matrix least-squares calculations to a final R of 0.054 for 348 observed diffractometer intensities. Passing through the unit cell are two antiparallel, infinite polar chains, each with symmetry mm2, extending along z and interacting with each other by weak van der Waals forces. Lead(II) is six-coordinate with a close, covalent hemisphere consisting of two bromine atoms [Pb—BrIBrII 2.93(1) Å], and two oxygen atoms [Pb—O,O′ 2.50(3) Å] which subtend an angle of 157.9(9)° at lead, located at the intersection of the O—Pb—O′ and BrI—Pb—BrII perpendicular mirror planes. The other hemisphere consists of bridging bromine atoms from the neighboring PbBr2•2dmso unit [Pb—BrIII,BrIV 3.24(1) Å], resulting in a rectangle of bromine atoms around lead [BrI—Pb—BrII 90.5(1)°, BrIII—Pb—BrIV 80.2(1)°]. The distortion of the octahedral coordination sphere around lead is discussed in terms of (a) a repulsive effect of the Pb(II) valence lone electron-pair, (b) weak Br—S bonding, and (c) crystal packing forces.

Crystal Structure of N,N'-Diphenyl-guanidinium m-Chlorobenzeneseleninate

1991 ◽  
Vol 44 (12) ◽  
pp. 1761 ◽  
Author(s):  
L Antolini ◽  
A Marchetti ◽  
C Preti ◽  
M Tagliazucchi ◽  
L Tassi ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Crystal Lattice ◽  
Vibrational Spectra ◽  
Crystal And Molecular Structure ◽  
Crystal Packing ◽  
Monoclinic Space Group ◽  
Space Group

The synthesis, and crystal and molecular structure of N,N′- diphenylguanidinium m- chlorobenzeneseleninate (C19H18CIN3O2Se), Mr 434.78, are reported. The crystal lattice of the compound belongs to the monoclinic space group P21/c with a 7.277(1), b 12.793(2), c 20.013(4) Ǻ, β 94.733(12)°, V 1859.8 Ǻ3, Z 4, Dobs 1.53 (by flotation), Dcalc 1.555 g cm-3, λ(Mo Kα ) 0.71069 Ǻ, μ 21.0 cm-1, F(000) 880, T 293 K, R 0.057 and Rw 0.059 for 1745 unique observed reflections with I>2.0σ(I). The crystal packing consists of parallel layers of anions intercalated with cations interacting through electrostatic contacts. Vibrational spectra have been also recorded, and are discussed.

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