An uncommon bonding mode of a familiar ligand: a molybdenum complex with a four-electron donor chelating η3-PPh3 ligand, and its structural determination using synchrotron radiation

1999 ◽  
pp. 1629-1630 ◽  
Author(s):  
Tan-Yun Cheng ◽  
David J. Szalda ◽  
R. Morris Bullock
Keyword(s):  
Synchrotron Radiation ◽  
Electron Donor ◽  
Structural Determination ◽  
Molybdenum Complex ◽  
Bonding Mode

On the Reaction of C(PPh3)2 with [Co2(CO)8]: Formation and Structure of an Unusual Tetranuclear Cluster

2007 ◽  
Vol 62 (3) ◽  
pp. 413-418 ◽  
Author(s):  
Wolfgang Petz ◽  
Kirstin Wenck ◽  
Bernhard Neumüller
Keyword(s):  
Electron Donor ◽  
High Yield ◽  
Triclinic Space Group ◽  
Tetranuclear Cluster ◽  
Space Group ◽  
X Ray ◽  
Bonding Mode

The reaction of the carbodiphosphorane C(PPh3)2 (1) with [Co2(CO)8] results in the formation of the salt-like complex (HC{PPh3}2)[Co(CO)4] (2) in high yield if THF is used as the solvent. The proton of the cation stems from THF degradation. When the reaction is carried out in toluene, the tetranuclear cluster [Co4(CO)10(PPh3)(μ4-CCPPh3)] (3) is formed in low yield as the only complex which could be identified by X-ray analysis. The solvate 3 ·C7H8 crystallizes in the triclinic space group P1̄ with a = 1040.8(2), b = 1387.4(2), c = 1923.0(2) pm, α = 71.96(1)°, β = 88.69(1)°, γ = 71.46(1)°, Z = 2. The structure of the cluster with 64 CVE is that of a “spiked triangle” in which the triphenylphosphonioacetylide CCPPh3 acts as a six-electron donor and the bonding mode is that of a μ4-η2 coordination.

scholarly journals Putative thioredoxin Trx1 fromThermosipho africanusstrain TCF52B: expression, purification and structural determination using S-SAD

2016 ◽  
Vol 72 (6) ◽  
pp. 443-447 ◽  
Author(s):  
Naheda Sahtout ◽  
Jijin R. A. Kuttiyatveetil ◽  
Michel Fodje ◽  
David A. R. Sanders
Keyword(s):  
Synchrotron Radiation ◽  
Light Source ◽  
Dispersion Analysis ◽  
Unit Cell ◽  
Structural Determination ◽  
Biological Processes ◽  
Unit Cell Parameters ◽  
Space Group ◽  
Cell Parameters ◽  
Sequence Identity

Thioredoxin is a small ubiquitous protein that plays a role in many biological processes. A putative thioredoxin, Trx1, fromThermosipho africanusstrain TCF52B, which has low sequence identity to its closest homologues, was successfully cloned, overexpressed and purified. The protein was crystallized using the microbatch-under-oil technique at 289 K in a variety of conditions; crystals grown in 0.2 MMgCl2, 0.1 Mbis-tris pH 6.5, 25%(w/v) PEG 3350, which grew as irregular trapezoids to maximum dimensions of 1.2 × 1.5 × 0.80 mm, were used for sulfur single-wavelength anomalous dispersion analysis. The anomalous sulfur signal could be detected to 2.83 Å resolution using synchrotron radiation on the 08B1-1 beamline at the Canadian Light Source. The crystals belonged to space groupP212121, with unit-cell parametersa= 40.6,b= 41.5,c= 56.4 Å, α = β = γ = 90.0°.

Thermal chemistry of molybdenum complex CpMo(NO)(CH2CMe3)2: Lewis base adducts of CpMo(NO)(:CHCMe3) and a new bonding mode for nitric oxide

1993 ◽  
Vol 12 (9) ◽  
pp. 3575-3585 ◽  
Author(s):  
Peter Legzdins ◽  
Steven J. Rettig ◽  
John E. Veltheer ◽  
Raymond J. Batchelor ◽  
Frederick W. B. Einstein
Keyword(s):  
Nitric Oxide ◽  
Lewis Base ◽  
Molybdenum Complex ◽  
Thermal Chemistry ◽  
Bonding Mode

New Bonding Mode for Cyanoacetylene:  A Tungsten(II) Fluoride Complex in Which Cyanoacetylene Serves as a Four-Electron Donor Alkyne Ligand

1996 ◽  
Vol 35 (21) ◽  
pp. 6352-6352
Author(s):  
Jaqueline L. Kiplinger ◽  
Atta M. Arif ◽  
Thomas G. Richmond
Keyword(s):  
Electron Donor ◽  
Fluoride Complex ◽  
Bonding Mode

Direct Observation of Monolayer Zones in Al-wt 4% Cu

1990 ◽  
Vol 48 (1) ◽  
pp. 14-15
Author(s):  
B. Jouffrey ◽  
D. Dorignac ◽  
A. Bourret
Keyword(s):  
Solid Solution ◽  
Synchrotron Radiation ◽  
Direct Observation ◽  
Supersaturated Solid Solution ◽  
Original Model ◽  
X Ray ◽  
Image Position

Since the early works on GP zones and the model independently proposed by Preston and Guinier on the first steps of precipitation in supersaturated solid solution of aluminium containing a few percent of copper, many works have been performed to understand the structure of different stages in the sequence of precipitation.The scheme which is generally admitted can be drawn from a work by Phillips.In their original model Guinier and Preston analysed a GP zone as composed of a single (100) copperrich plane surrounded by aluminum atomic planes with a slightly shorter distance from the original plane than in the solid solution.From X-ray measurements it has also been shown that GP1 zones were not only copper monolayer zones. They could be up to a few atomic planes thick. Different models were proposed by Guinier, Gerold, Toman. Using synchrotron radiation, proposals have been recently made.

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