Intramolecular photochemical hydrogen abstraction reactions in the solid state. Correlation with x-ray crystal structure data

1976 ◽  
Vol 98 (19) ◽  
pp. 6049-6051 ◽  
Author(s):  
Alice A. Dzakpasu ◽  
Simon E. V. Phillips ◽  
John R. Scheffer ◽  
James Trotter
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Structure Data ◽  
Crystal Structure Data ◽  
Hydrogen Abstraction ◽  
State Correlation ◽  
X Ray

Synthesis and Crystal Structure of 5,10,15,20-Tetrakis(3,5-dinitrophenyl)porphyrin

1998 ◽  
Vol 02 (05) ◽  
pp. 391-396 ◽  
Author(s):  
P. BHYRAPPA ◽  
K. S. SUSLICK
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Structure Data ◽  
Crystal Structure Data ◽  
Unit Cell ◽  
Monoclinic Space Group ◽  
State Structure ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray

The synthesis, characterization and crystal structure of the octanitro-substituted porphyrin 5,10,15,20-tetrakis(3,5-dinitrophenyl)porphyrin, H 2 T (3,5- DNP ) P , are described. The solid state structure has two porphyrins in the unit cell with eight pyridine solvates and is made up from columnar arrays of the porphyrins. X-ray crystal structure data: monoclinic, space group P1 21/n1, a = 14.9996(9) Å, b = 8.2489(5) Å, c = 24.818(2) Å, α = 90 °, β = 104.172(1) °, γ = 90 °, V = 2977.3(3) Å3, dcalc = 1.440 g m-3, Z = 2.

Selection and Evaluation of Materials for Thermoelectric Applications II

1997 ◽  
Vol 478 ◽  
Author(s):  
Jeff W. Sharp
Keyword(s):  
Crystal Structure ◽  
State Physics ◽  
Solid State ◽  
Band Structure ◽  
Structure Data ◽  
Crystal Structure Data ◽  
Charge Carriers ◽  
The Other ◽  
New Materials ◽  
Solid State Physics

AbstractIn good thermoelectrics phonons have short mean free paths, and charge carriers have long ones. The other requirements are a multivalley band structure and a band gap greater than 0.1 eV for the 200 to 300 K temperature range. We discuss the use of solid state physics and chemistry concepts, along with atomic and crystal structure data, to select the new materials most likely to meet these criteria.

X-Ray Crystal Structure Analysis of Substituted 5-(2,3-Dihydro-7-benzofuryl)- 2-methylpyrazolo[4,3-d]pyrimidin-7-one (iso-Biagra) [1]

2000 ◽  
Vol 55 (11) ◽  
pp. 1079-1082
Author(s):  
Mustafa M. El-Abadelah ◽  
Salim S. Sabri ◽  
Monther A. Khanfar ◽  
Wolfgang Voelter ◽  
Cacilia Maichle-Mössmer
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Structure Data ◽  
Interatomic Distance ◽  
Crystal Structure Data ◽  
Lone Pair ◽  
Crystal Structure Analysis ◽  
Interplanar Angle ◽  
X Ray ◽  
Intramolecular Hydrogen

X-ray crystal structure data for the substituted 5-(2,3-dihydro-7-benzofuryl)-2-methylpyrazolo[ 4,3-d]pyrimidin-7-one (3) reveal that the two bicyclic heteroaryl systems show no coplanarity along their joint C (5) - C (11) axis with an interplanar angle of 9.6°. Nonetheless, the spatial interatomic distance for O(17)-N(6), determined as 2.73 A, allows the formation of a relatively weak intramolecular hydrogen bond between the pyrimidinone N(6)-H and the O(17) lone pair of the dihydrobenzofuryl moiety.

The 125Te Mössbauer Absorption Spectra of Tellurium Complexes with Sulfur-Containing Ligands

1975 ◽  
Vol 53 (13) ◽  
pp. 1855-1860 ◽  
Author(s):  
Robert Michael Cheyne ◽  
Colin Henry Wilson Jones ◽  
Steinar Husebye
Keyword(s):  
Crystal Structure ◽  
Absorption Spectra ◽  
Structure Data ◽  
Mössbauer Spectra ◽  
Crystal Structure Data ◽  
X Ray ◽  
Mossbauer Spectra ◽  
Distorted Octahedral ◽  
Sulfur Containing ◽  
Bonding Scheme

The 125Te Mössbauer spectra of a number of Te(II) and Te(IV) complexes with sulfur-containing ligands have been measured. The Te(II) compounds exhibit large quadrupole splittings of 12.4 to 15.2 mm s−1 and isomer shifts (125I/Cu) of + 0.33 to + 0.91 mm s−1. These data are interpreted as evidence for the incorporation of some 5s character in the bonding scheme for several of the compounds, consistent with the interpretation of X-ray crystal structure data. For the Te(IV) compounds 6, 7, and 8 coordinate molecules have been studied containing tellurium in distorted octahedral, pentagonal bipyramidal, and dodecahedral coordination.

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