Elemental Carbon Chain Bridging Two Iron Centers: Syntheses and Spectroscopic Properties of [Cp*(dppe)Fe-C4-FeCp*(dppe)]n+.cntdot.n[PF6]-. X-ray Crystal Structure of the Mixed Valence Complex (n = 1)

1995 ◽  
Vol 117 (27) ◽  
pp. 7129-7138 ◽  
Author(s):  
Nathalie Le Narvor ◽  
Loic Toupet ◽  
Claude Lapinte
Keyword(s):  
Crystal Structure ◽  
Elemental Carbon ◽  
Mixed Valence ◽  
Spectroscopic Properties ◽  
Carbon Chain ◽  
X Ray ◽  
Mixed Valence Complex

Über die Darstellung neuer spirocyclischer N,N′-Dimethylsulfamid-substituierter Phosphorverbindungen und Ν,N′-Dimethylsulfamid-verbrückter Diphosphorverbindungen / The Preparation of New Spirocyclic N,N′-Dimethylsulphamide-Substituted Phosphorus Compounds, and of Some N,N′-Dimethylsulphamide-Bridged Diphosphorus Compounds

1990 ◽  
Vol 45 (2) ◽  
pp. 175-183 ◽  
Author(s):  
Peter G. Jones ◽  
Anke Meyer ◽  
Reinhard Schmutzler
Keyword(s):  
Crystal Structure ◽  
Nitrogen Atom ◽  
Structure Determination ◽  
Sodium Azide ◽  
Mixed Valence ◽  
Spectroscopic Properties ◽  
Phosphorus Compounds ◽  
Molar Ratio ◽  
X Ray ◽  
Trigonal Bipyramidal

The reactions of 4-chloro-1,3,5,7-tetramethyl-2,2,6,6-tetraoxa-2,6-dithia-1,3,5,7-tetraaza-4λ5-phosphaspiro[3.3]heptane (1) with trimethylsilyl compounds and sodium azide led to a series of spirocyclic N,N′-dimethylsulphamide-substituted phosphoranes (2—5). The nature of the pentaaza-spirophosphorane (4) was confirmed by an X-ray crystal structure determination (C2/c, a = 991.8(4), b = 1185.6(6), c = 1224.9(5) pm,β = 108.64(3)°, Z = 4, R = 0.041 for 1065 unique observed reflections); a crystallographic twofold axis passes through phosphorus and the nitrogen atom of the NMe2 group. The geometry at phosphorus is to a good approximation trigonal bipyramidal. The azido-spirophosphorane (5) undergoes Staudinger-type reactions with phosphorus(III) compounds (PPh3, dppm) to form the mixed-valence phosphorus compounds 6—8. The reaction of N,N′-dimethylsulphamide or N,N′-dimethyl-N,N′-bis(trimethylsilyl)-sulphamide with dichlorophosphines RPCl2 (R = Me, Ph) in a molar ratio 1:2 leads to the formation of the acyclic N,N′-dimethylsulphamide-bridged diphosphorus compounds 9 and 10, respectively. The spectroscopic properties (and, for 4, the X-ray crystal structure) of the products are compared with those of analogous urea-bridged phosphorus compounds.

Systhesis, Characterization and Spectroscopic Properties of (2E,6E)-2,6-Bis(2,3,4-tri-methoxy-benzylidene)cyclohexanone

2011 ◽  
Vol 396-398 ◽  
pp. 2338-2341
Author(s):  
Xing Chuan Wei ◽  
Zhi Li Liu ◽  
Kun Zhang ◽  
Zhi Yun Du ◽  
Xi Zheng
Keyword(s):  
Crystal Structure ◽  
Acetic Acid ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Spectroscopic Properties ◽  
Spectral Studies ◽  
Double Bonds ◽  
X Ray ◽  
Π Interactions ◽  
X Ray Crystallography

In this paper, (2E,6E)-2,6-Bis(2,3,4-tri-methoxy -benzylidene)cyclohexanone (omitted as tmbcho) (1) was obtained by the reaction of acetic acid, tetrahydrofuran, cyclohexanone and 2,3,4-tri-methoxy-benzaldehyde. Three non-classic hydrogen bonds were observed in the compound. X-ray crystallography shows that the crystal structure is stabilized by intermolecular C-H•••π interactions and it contains plenty of conjugated double bonds. The title compound was characterized by UV-vis and fluorescent spectral studies.

Gemischtvalente Oxovanadate, I Ein neuer Strukturtyp für die Verbindung BaV10O15/Oxovanadates with Mixed Valence, I A New Crystal Structure of BaV10O15

1980 ◽  
Vol 35 (6) ◽  
pp. 669-671 ◽  
Author(s):  
D. Chales de Beaulieu ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Mixed Valence ◽  
Structure Type ◽  
Orthorhombic Symmetry ◽  
Temperature Reaction ◽  
X Ray ◽  
High Temperature Reaction ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract BaV10O15 was prepared by high temperature reaction of BaO and V2O3 in H2-atmosphere (T > 1800°). X-ray investigations of single crystals show a new structure type with octa-hedral coordination of V3+/V2+ (statistical distribution) and cuboctahedral surrounding of Ba2+ . Orthorhombic symmetry, space group D182h-Ccmb, a = 995,8; b = 1161,8; c = 941,0; Z = 4.

Monoolefincobalt(0)-Komplexe / Monoolefincobalt(0) Complexes

1988 ◽  
Vol 43 (10) ◽  
pp. 1256-1262 ◽  
Author(s):  
Hans-Friedrich Klein ◽  
Goetz Lull ◽  
Birgit Rodenhäuser ◽  
Gerhard Cordier ◽  
Helmut Paulus
Keyword(s):  
Crystal Structure ◽  
Carbon Monoxide ◽  
Valence State ◽  
Cobalt Atom ◽  
Spectroscopic Properties ◽  
X Ray ◽  
Mononuclear Cobalt ◽  
Structure Determinations

Mononuclear cobalt(o) complexes containing olefin and trimethylphosphane ligands Co(olefin)(PMe3)3 (olefin = C2H4 (1), C3H6 (2), cyclopentene (3), trans-1,2-diphenylethene (4), tetrafluorobenzo-bicyclo-(2.2.2)-octadiene (5)), are obtained from CoCl2 by reaction with magnesium in the presence of the ligands or by substitution of 3 with olefin. X-ray crystal structure determinations of 4 and 5 show a distorted tetrahedral arrangement of ligands around the cobalt atom. Chemical and spectroscopic properties are consistent with a paramagnetic valence state of the compounds in solution. By reaction with carbon monoxide a dicobalt complex is formed, while azobenzene gives paramagnetic Co(N2Ph2)(PMe3)2.

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