Macrocyclic tetrakis-phosphines and their copper(I) complexes

2017 ◽  
Vol 89 (3) ◽  
pp. 331-339 ◽  
Author(s):  
Elvira I. Musina ◽  
Tatiana I. Wittmann ◽  
Alexey B. Dobrynin ◽  
Peter Lönnecke ◽  
Evamarie Hey-Hawkins ◽  
...  
Keyword(s):  
Single Crystal ◽  
Phosphine Ligands ◽  
X Ray Diffraction ◽  
Tetranuclear Complex ◽  
X Ray

AbstractA series of mono-, di- and tetranuclear copper(I) complexes with macrocyclic 14-, 16-, 18- and 20-membered tetrakis-phosphine ligands (P4N2) was obtained and fully characterized including single crystal X-ray diffraction. The 14-membered P4N2 macrocycles form very stable cationic mononuclear tetraphospha-coordinated copper(I) complexes, whereas their higher 16-, 18- and 20-membered homologues give neutral dinuclear [Cu2I2L] complexes under the same conditions. An unusual tetranuclear complex with two three- and two four-coordinated copper(I) atoms was obtained from 16-PMes4NCH2CH2Py-22 and copper(I) iodide. This is the first example of N-coordination of cyclic aminomethylphosphines towards “soft” copper(I).

scholarly journals Using phosphine ligands with a biological role to modulate reactivity in novel platinum complexes

2018 ◽  
Vol 5 (2) ◽  
pp. 171340 ◽  
Author(s):  
Marcelo Echeverri ◽  
Amparo Alvarez-Valdés ◽  
Francisco Navas ◽  
Josefina Perles ◽  
Isabel Sánchez-Pérez ◽  
...  
Keyword(s):  
Single Crystal ◽  
Platinum Complex ◽  
Platinum Complexes ◽  
Phosphine Ligands ◽  
Biological Role ◽  
Biological Models ◽  
X Ray Diffraction ◽  
X Ray ◽  
Calf Thymus ◽  
The Stability

Three platinum complexes with cis and trans configuration cis -[Pt(TCEP) 2 Cl 2 ], cis -[Pt(tmTCEP) 2 Cl 2 ] and trans -[Pt(TCEP) 2 Cl 2 ], where TCEP is tris(2-carboxyethyl)phosphine, have been synthesized and fully characterized by usual techniques including single-crystal X-ray diffraction for trans -[Pt(TCEP) 2 Cl 2 ] and cis -[Pt(tmTCEP) 2 Cl 2 ]. Here, we also report on an esterification process of TCEP, which takes place in the presence of alcohols, leading to a platinum complex coordinated to an ester tmTCEP (2-methoxycarbonylethyl phosphine) ligand. The stability in solution of the three compounds and their interaction with biological models such as DNA (pBR322 and calf thymus DNA) and proteins (lysozyme and RNase) have also been studied.

Investigation of the light-induced electron-transfer-coupled spin transition in a cyanide-bridged [Co2Fe2] complex by X-ray diffraction and absorption measurements

2014 ◽  
Vol 1 (7) ◽  
pp. 540-543 ◽  
Author(s):  
Yoshihiro Sekine ◽  
Masayuki Nihei ◽  
Reiji Kumai ◽  
Hironori Nakao ◽  
Youichi Murakami ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Single Crystal ◽  
Spin Transition ◽  
X Ray Diffraction ◽  
Tetranuclear Complex ◽  
X Ray ◽  
Absorption Measurements

The light-induced electron-transfer-coupled spin transition in a cyanide-bridged [Co2Fe2] tetranuclear complex has been investigated by single-crystal X-ray diffraction and absorption measurements.

Luminescent Silver(I) and Copper(I) Systems Containing Pyridyl Phosphine Bridges

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1525-1534 ◽  
Author(s):  
Olga Crespo ◽  
M. Concepción Gimeno ◽  
Antonio Laguna ◽  
Carmen Larraz
Keyword(s):  
Solid State ◽  
Single Crystal ◽  
Room Temperature ◽  
Silver Salt ◽  
Phosphine Ligands ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molar Ratios ◽  
Pyridylphosphine Ligands

Luminescent silver(I) and copper(I) complexes containing pyridylphosphine ligands have been synthesized and structurally characterized by single crystal X-ray diffraction methods. The reaction of Ag(OTf) (OTf = trifluoromethanesulfonate) with 2-pyridyldiphenylphosphine in different molar ratios gives the species [Ag2(OTf)2(μ-PPh2py)2] (1), [Ag(PPh2py)2]OTf (2), [Ag(PPh2py)3]OTf (3), and [Ag2(PPh2py)3](OTf)2 (4) with several modes of coordination of the pyridylphosphine. The oxidation of the phosphine in compound 4 gave [Ag2(OTf)(μ-PPh2py)2(OPPh2py)]OTf (5) which has been structurally characterized. It shows two bridging phosphine ligands and one chelating OPPh2py ligand. The reactions of the silver salt with bis(2-pyridyl)phenylphosphine in different molar ratios affords the complex [Ag2(OTf)2(μ-PPhpy2)2] (6), while the corresponding reactions with [Cu(NCMe)4]PF6 lead to two different compounds, namely [Cu2(NCMe)2(μ-PPhpy2)2](PF6)2 (7) and [Cu2(PPhpy2)2(μ-PPhpy2)2](PF6)2 (8). All complexes exhibit luminescence in the solid state at room temperature and at 77 K

Electron Microscopy of Shock Loaded Polycrystalline Beryllium

1974 ◽  
Vol 32 ◽  
pp. 506-507 ◽  
Author(s):  
J. M. Galbraith ◽  
L. E. Murr ◽  
A. L. Stevens
Keyword(s):  
Electron Microscopy ◽  
Wave Propagation ◽  
Structural Change ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Shock Loading ◽  
Slip Systems ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

Crystal structure of an inclusion complex between chiral monoaza-15-crown-5 and S(–)-1-phenyl-ethyl ammonium percholorate

2003 ◽  
Vol 218 (5) ◽  
Author(s):  
Süheyla Özbey ◽  
F. B. Kaynak ◽  
M. Toğrul ◽  
N. Demirel ◽  
H. Hoşgören
Keyword(s):  
Crystal Structure ◽  
Inclusion Complex ◽  
Single Crystal ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
New Type

AbstractA new type of inclusion complex, S(–)-1 phenyl ethyl ammonium percholorate complex of R-(–)-2-ethyl - N - benzyl - 4, 7, 10, 13 - tetraoxa -1- azacyclopentadecane, has been prepared and studied by NMR, IR and single crystal X-ray diffraction techniques. The compound crystallizes in space group

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