Synthesis, structural characterization, and reactivity of Cp*Ru(N-phosphinoamidinate) complexes

2014 ◽  
Vol 92 (3) ◽  
pp. 194-200 ◽  
Author(s):  
Colin M. Kelly ◽  
Adam J. Ruddy ◽  
Craig A. Wheaton ◽  
Orson L. Sydora ◽  
Brooke L. Small ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Structural Characterization ◽  
Ammonia Borane ◽  
The Stability

We report herein on the synthesis and spectroscopic/crystallographic characterization of the first isolable, formally 16-electron Cp*Ru(κ2-P∼N) species, which are supported by N-phosphinoamidinate ligands. Despite the stability of such complexes, they have been shown to readily coordinate two-electron (L) donors including carbon monoxide and 2,6-xylylisocyanide, affording crystallographically characterized 18-electron Cp*Ru(L)(κ2-P∼N) adducts. Preliminary reactivity studies confirm that such complexes are capable of extruding hydrogen from ammonia borane.

Synthesis, crystallization, X-ray structural characterization and solid-state assembly of a cyclic hexapeptoid with propargyl and methoxyethyl side chains

2017 ◽  
Vol 73 (3) ◽  
pp. 399-412 ◽  
Author(s):  
Consiglia Tedesco ◽  
Eleonora Macedi ◽  
Alessandra Meli ◽  
Giovanni Pierri ◽  
Giorgio Della Sala ◽  
...  
Keyword(s):  
Solid State ◽  
Hydrogen Bonds ◽  
Structural Characterization ◽  
Crystal Form ◽  
Side Chains ◽  
Crystal Forms ◽  
Hydrate Crystal ◽  
The Stability ◽  
Efficient Packing

The synthesis and the structural characterization of a cyclic hexapeptoid with four methoxyethyl and two propargyl side chains have disclosed the presence of a hydrate crystal form [form (I)] and an anhydrous crystal form [form (II)]. The relative amounts of form (I) and form (II) in the as-purified product were determined by Rietveld refinement and depend on the purification procedures. In crystal form (I), peptoid molecules assemble in a columnar arrangement by means of side-chain-to-backbone C=CH...OC hydrogen bonds. In the anhydrous crystal form (II), cyclopeptoid molecules form ribbons by means of backbone-to-backbone CH2...OC hydrogen bonds, thus mimicking β-sheet secondary structures in proteins. In both crystal forms side chains act as joints among the columns or the ribbons and contribute to the stability of the whole solid-state assembly. Water molecules in the hydrate crystal form (I) bridge columns of cyclic peptoid molecules, providing a more efficient packing.

Spectroscopic, Redox, and Structural Characterization of the Ni-Labile and Nonlabile Forms of the Acetyl-CoA Synthase Active Site of Carbon Monoxide Dehydrogenase

1998 ◽  
Vol 120 (30) ◽  
pp. 7502-7510 ◽  
Author(s):  
William K. Russell ◽  
Christina M. V. Stålhandske ◽  
Jinqiang Xia ◽  
Robert A. Scott ◽  
Paul A. Lindahl
Keyword(s):  
Carbon Monoxide ◽  
Structural Characterization ◽  
Active Site ◽  
Carbon Monoxide Dehydrogenase ◽  
Acetyl Coa
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