P−C Bond Activation and Phenyl Group Transfer in the Reaction of Co4(CO)9(mesitylene) with 2,3-Bis(diphenylphosphino)maleic Anhydride (bma). X-ray Diffraction Structures and Redox Properties of Co3(CO)7[μ2-η2,η1-P(Ph)CC(PPh2)C(O)OC(O)] and Co3(CO)6(PPh3)[μ2-η2,η1-P(Ph)CC(PPh2)C(O)OC(O)]

1996 ◽  
Vol 15 (21) ◽  
pp. 4480-4487 ◽  
Author(s):  
Chun-Gu Xia ◽  
Kaiyuan Yang ◽  
Simon G. Bott ◽  
Michael G. Richmond
Keyword(s):  
Maleic Anhydride ◽  
Bond Activation ◽  
Phenyl Group ◽  
Redox Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Group Transfer

Hydrogénation of phosphido bridged ruthenium clusters. A view of P—C bond activation and cleavage in the coordinatively unsaturated molecule Ru3(CO)9(μ2-PPh2)(μ2-H): conversion of μ2-PPh2 to μ3-PPh

1982 ◽  
Vol 60 (1) ◽  
pp. 87-90 ◽  
Author(s):  
Shane A. Maclaughlin ◽  
Arthur J. Carty ◽  
Nicholas J. Taylor
Keyword(s):  
Bond Activation ◽  
Phenyl Group ◽  
Synthetic Route ◽  
X Ray Diffraction ◽  
Ruthenium Clusters ◽  
X Ray ◽  
Ruthenium Atom ◽  
Unsaturated Molecule ◽  
Insight Into

Treatment of Ru3(CO)8(μ3-η2-C≡CR)(μ2-PPh2)(R = But, Pri) with dihydrogen liberates olefin (CH2=CHR) and generates the coordinatively unsaturated cluster Ru3(CO)9(μ2-PPh2)(μ2-H) which has been shown by X-ray diffraction to have an unprecedented μ2-phosphido bridge in which a P—phenyl group interacts with an electron deficient ruthenium atom. This molecule provides an insight into P—C bond activation leading to cleavage. Further reaction of Ru3(CO)9(μ2-PPh2)(μ2-H) with H2 leads to the phosphinidene cluster Ru3(CO)9(μ3-PPh)(μ2-H)2 via elimination of benzene. Conversion of Ru3(CO)9(μ2-PPh2)(μ2-H) to another phosphinidene cluster Ru4(CO)13(μ3-PPh) occurs on pyrolysis. Hydrogénation of multi-site bound acetylides with H2 is a potentially useful synthetic route to unsaturated clusters. Hydrogenative conversion of μ2-PPh2 to μ3-PPh groups has significance for the synthesis of phosphinidene capped molecules as well as the chemistry of phosphido bridged clusters.

A Novel Indole-Containing Diarylethene: Synthesis, Crystal Structure and Photochromism

2017 ◽  
Vol 41 (7) ◽  
pp. 423-426 ◽  
Author(s):  
Chunhong Zheng ◽  
Guanming Liao ◽  
Congbin Fan ◽  
Renjie Wang ◽  
Shouzhi Pu
Keyword(s):  
Crystal Structure ◽  
Quantum Yield ◽  
Single Crystal ◽  
Diffraction Analysis ◽  
Phenyl Group ◽  
X Ray Diffraction ◽  
X Ray ◽  
Meta Position ◽  
Thiophene Moiety ◽  
Photochemical Properties

An indole-containing diarylethene with a trifluoromethyl function at the meta-position of the phenyl group attached to the thiophene moiety was synthesised. Its structure was determined by single-crystal X-ray diffraction analysis and its photochemical properties in solution and in the single crystalline phases were studied. The compound showed relatively high fluorescent modulation efficiency and cyclisation quantum yield.

Photochemically Induced C-H Bond Activation and Ligand Transfer in the Reaction of [Cp2Rh2(CO)(CF3C2CF3)] With [(Cp′) Mn (CO)2( thf )]: Structural Characterization of the Rh4 Product

1994 ◽  
Vol 47 (8) ◽  
pp. 1613 ◽  
Author(s):  
RS Dickson ◽  
MJ Liddell ◽  
BW Skelton ◽  
AH White
Keyword(s):  
Room Temperature ◽  
Bond Activation ◽  
X Ray Diffraction ◽  
Full Matrix ◽  
X Ray ◽  
Corrected Data ◽  
Ligand Transfer ◽  
Hydrocarbon Solution ◽  
Induced Reaction

A room-temperature single-crystal X-ray diffraction study carried out on a product of a sunlight induced reaction between [Cp2Rh2(CO)(CF3C2CF3)] and [(Cp′) Mn (CO)2( thf )] in 2:1 ratio in hydrocarbon solution establishes it to be tetranuclear [(Cp4Rh4)(CF3C=CHCF3)2(CH3-C5H3)]; crystals of the latter are triclinic, Pī , a 15.803(9), b 13.445(8), c 8.966(6) Ǻ, α 75.92(5), β 80.68(5), γ 65.46(4)°, Z = 2. Full-matrix refinement for 3431 'observed' [I > 3σ(I)], absorption-corrected data converged at R 0.056. The structure comprises a pair of enantiomeric [(Cp2Rh2)(CF3C=CHCF3 binuclear units unsymmetrically linked by the central CH3C5H3 ring, by way of the η1,η2-C=CH and η1,η2-C= CMe functionalities.

scholarly journals Iridium-Promoted B–B Bond Activation: Preparation and X-ray Diffraction Analysis of a mer-Tris(boryl) Complex

2019 ◽  
Vol 58 (8) ◽  
pp. 4712-4717 ◽  
Author(s):  
Miguel A. Esteruelas ◽  
Israel Fernández ◽  
Antonio Martínez ◽  
Montserrat Oliván ◽  
Enrique Oñate ◽  
...  
Keyword(s):  
Diffraction Analysis ◽  
Bond Activation ◽  
X Ray Diffraction ◽  
X Ray

Synthese und Struktur von α,β-ungesättigten aliphatischen Diazenen / Preparation and Structures of α,β-Unsaturated Aliphatic Diazenes

1989 ◽  
Vol 44 (5) ◽  
pp. 543-547 ◽  
Author(s):  
Herbert W. Roesky ◽  
Uwe Otten ◽  
Regine Herbst ◽  
Mathias Noltemeyer
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Hydrogen Chloride ◽  
Phenyl Group ◽  
X Ray Diffraction ◽  
X Ray

The reactions of 1,1,2,2-tetrafluoroethane-1,2-bisulfenyl-chloride 1 and symmetrical azines 2 yield the conjugated trans-diazenes 3 as deep-coloured solids. Unsymmetrical azines 4 react with 1 under elimination of hydrogen chloride to give 1,3-dithiolane-substituted azine derivatives as pale-coloured liquids. The crystal structure of 3b has been determined by single crystal X-ray diffraction. A participation of the phenyl group in the conjugated system is not observed in 3b.

Effect of unsaturation on physicochemical properties of maleic anhydride–grafted acrylonitrile butadiene styrene terpolymer

2017 ◽  
Vol 50 (6) ◽  
pp. 520-536 ◽  
Author(s):  
Olongal Manaf ◽  
Sheeja ◽  
Ameen Jowhar ◽  
Athiyanathil Sujith
Keyword(s):  
Maleic Anhydride ◽  
Iodine Value ◽  
Flexural Modulus ◽  
Slight Modification ◽  
Acrylonitrile Butadiene Styrene ◽  
Attenuated Total Reflectance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Internal Mixer ◽  
Butadiene Styrene

In order to find out the shift of ductile nature of acrylonitrile-butadiene-styrene (ABS) polymer to brittle nature while maleic anhydride (MA) grafting, the iodine value of different MA-grafted ABS (MA-g-ABS) sampled has been determined. The iodine value of thermoplastic polymer is found by Wijs method with slight modification to overcome the poor solubility of thermoplastics in tetrachloromethane. Different samples with varying MA content were prepared using internal mixer. All the specimens were characterized by attenuated total reflectance IR spectroscopy and X-ray diffraction analysis. The iodine value measurements revealed that grafting and cross-linking evidently reduced the unsaturation in ABS polymer matrix. The grafting of MA causes the decrease in impact strength, flexural modulus, and a significant increase in crystallinity, tensile strength, yield point, and flexural strength, whereas thermal stability remains intact. Field emission scanning electron microscope images showed noticeable difference in broken surface texture between ABS and grafted samples.

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