Design and Structure Analysis of Artificial Metalloproteins:  Selective Coordination of His64 to Copper Complexes with Square-Planar Structure in theapo-Myoglobin Scaffold

2007 ◽  
Vol 46 (13) ◽  
pp. 5137-5139 ◽  
Author(s):  
Satoshi Abe ◽  
Takafumi Ueno ◽  
Pattubala A. N. Reddy ◽  
Seiji Okazaki ◽  
Tatsuo Hikage ◽  
...  
Keyword(s):  
Structure Analysis ◽  
Copper Complexes ◽  
Planar Structure ◽  
Square Planar

Electronic structure of nitrogen square planar copper complexes in Langmuir-Blodgett films

1992 ◽  
Vol 210-211 ◽  
pp. 519-520
Author(s):  
Stéphane Carniato ◽  
Henri Roulet ◽  
Georges Dufour ◽  
Serge Palacin ◽  
André Barraud ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Copper Complexes ◽  
Langmuir Blodgett ◽  
Square Planar ◽  
Langmuir Blodgett Films

Übergangsmetallkomplexe mit Schwefelliganden, LXXVI Redox- und Additionsreaktionen von Nickelkomplexen mehrzähniger Thioether-Thiolat-Liganden. Röntgenstrukturanalysen von (NMe4)2[Ni(′S2′)2] und [Ni(′S4 – C3′)(PMe3)] / Transition Metal Complexes with Sulfur Ligands, LXXVI Redox and Addition Reactions of Nickel Complexes with Multidentate Thioether-Thiolato Ligands. X-Ray Structure Determinations of (NMe4)2[Ni(′S2′)2] and [Ni(′S4–C3′)(PMe3)]

1991 ◽  
Vol 46 (12) ◽  
pp. 1601-1608 ◽  
Author(s):  
Dieter Sellmann ◽  
Stefan Fünfgelder ◽  
Falk Knoch ◽  
Matthias Moll
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Structure Analysis ◽  
Transition Metal Complexes ◽  
Nickel Complexes ◽  
Addition Reactions ◽  
Coordination Geometry ◽  
X Ray ◽  
Square Planar ◽  
Structure Determinations

In order to elucidate specific properties of nickel sulfur complexes, redox and addition-elimination reactions of [Ni(′OS4')]2, [Ni(′NHS4')]2, [Ni(′S5')], [Ni('S4—C5')], and [Ni('S4—C3')] were investigated ('OS4′ 2' = 2,2'-bis(2-mercaptophenylthio)diethylether(2—), 'NHS4'2- = 2,2'-bis(2-mercaptophenylthio)diethylamine(2—), 'S5'2- = 2,2'-bis(2-mercaptophenylthio)diethylsulfide(2—), 'S4-C5'2- = 1,5-bis(2-mercaptophenylthio)pentane(2—), 'S4—C3'2- = 1,3-bis(2-mercaptophenylthio)propane(2—)).Cyclovoltammetry proves the complexes to be redox inactive between —1.4 and +0.8 V vs. NHE. Above +0.8 V the complexes are irreversibly oxidized, below —1,4 V desalkylation takes place and [Ni(′S,′)2]2- is formed. An X-ray structure analysis was carried out of (NMe4)2[Ni(′S2')2], which shows a planar anion with the Ni center in a nearly perfect square planar coordination. Distances and angles are practically identical to those in the [Ni(′S2')2-] monoanion.The complexes coordinate only phosphines as coligands, but thioether donors simultaneously decoordinate and, dependant of reaction temperature, mono- or trisphosphine complexes are formed. [Ni(′S4—C3')(PMe3)] was characterized by X-ray structure analysis and exhibits a square pyramidal coordination geometry.

scholarly journals Synthese und Struktur diastereomerer, zweikerniger Kupferkomplexe [1] / Synthesis and Structure of Diastereomerie Dinuclear Copper Complexes [1]

1994 ◽  
Vol 49 (10) ◽  
pp. 1410-1414 ◽  
Author(s):  
Rolf W. Saalfrank ◽  
Oliver Struck ◽  
Karl Peters ◽  
Hans Georg von Schnering
Keyword(s):  
Structure Analysis ◽  
Copper Complexes ◽  
Molar Ratio ◽  
Dinuclear Copper ◽  
X Ray ◽  
Dark Green ◽  
2D Polymer ◽  
Light Green

Abstract Depolymerisation of a copper(II)/pyrrolidine-based 2D -polymer 2 by 4,4′-bipyridyl [molar ratio: 2 (CuL2) : 1 (Bipy)] and recrystallisation of the reaction product leads to two visually distinguishable crystal charges, composed of dark green octahedra meso-4 and light green rod-shaped crystals racem-5. Separation of the conglomerate of the morphologically different crystals is accomplished by pick out. The structure of the dinuelear complex racem-5 has been established unambigously by X-ray structure analysis. EPR and susceptibility measurements of mixtures of complex meso-4 and racem-5 indicate that there is no interaction be­tween the two copper(II) centres.

Nickel(II) complexes of some o-hydroxyarylcarbonyl compounds. II. Some 5-substituted 2-hydroxyaryl ketones

1968 ◽  
Vol 21 (4) ◽  
pp. 907 ◽  
Author(s):  
DP Graddon ◽  
GM Mockler
Keyword(s):  
High Spin ◽  
Planar Structure ◽  
Monomeric Form ◽  
Equilibrium Studies ◽  
Molecular Weights ◽  
Square Planar ◽  
Two Stages

Nickel(11) complexes of the type NiL2Bn have been prepared where L = 2-hydroxy-5-methylacetophenone, 2-hydroxy-5-methylbenzophenone, or 5-chloro-2-hydroxybenzophenone; B = H2O or 4-methylpyridine; n = 2 or 0. The properties of these compounds closely resemble those of the unsubstituted compounds described in Part I. Molecular weights of the anhydrous compounds NiL, indicate a monomer-polymer equilibrium in non-donor solvents, the solute being almost wholly monomeric at concentrations below 10-2M. Equilibrium studies in 2.5M 10-8M solution show that NiL2 reacts with 4-methylpyridine in two stages with a five-coordinate intermediate NiL2B, analogous to corresponding copper(11) complexes. The properties of the monomeric form of NiL, are consistent with a high-spin square-planar structure.

scholarly journals Bis(μ-diisopropylphosphanido-κ2 P:P)bis[hydrido(triisopropylphosphane-κP)platinum(II)]

2012 ◽  
Vol 68 (6) ◽  
pp. m808-m808
Author(s):  
Nicole Arnold ◽  
Holger Braunschweig ◽  
Alexander Damme
Keyword(s):  
Molecular Structure ◽  
Title Compound ◽  
The Other ◽  
Planar Structure ◽  
Square Planar

In the centrosymmetric molecular structure of the title compound [Pt2(C6H14P)2H2(C9H21P)2], each PtII atom is bound on one side to a phosphane ligand (PiPr3) and a hydrido ligand. On the other side, it is bound to two phosphanide ligands (μ-PiPr2), which engage a bridging position between the two PtII atoms, forming a distorted square-planar structure motif. The Pt...Pt distance is 3.6755 (2) Å. A comparable molecular structure was observed for bis(μ-di-tert-butylphosphanido)bis[hydrido(triethylphosphane)platinum(II)] [Itazaki et al. (2004). Organometallics, 23, 1610–1621].

Thio derivatives of b-diketones and their metal chelates. XXII. Dipole moments of some bivalent and trivalent metal complexes of fluorinated monothio-b-diketones

1976 ◽  
Vol 29 (4) ◽  
pp. 767 ◽  
Author(s):  
M Das ◽  
SE Livingstone ◽  
JH Mayfield ◽  
DS Moore ◽  
N Saha
Keyword(s):  
Copper Complexes ◽  
Dipole Moments ◽  
Platinum Complexes ◽  
Mean Value ◽  
Tetrahedral Configuration ◽  
Square Planar ◽  
Palladium And Platinum Complexes ◽  
Static Polarization ◽  
The Moment ◽  
Derivatives Of

Dipole moments have been determined by static polarization measurements for some iron(111), ruthenium(111), rhodium(111), nickel(11), palladium(11), platinum(11), copper(11) and zinc(11) complexes of fluorinated monothio-β-diketones RC(SH)=CHCOCF3. The moments indicate a facial-octahedral configuration for the iron, ruthenium and rhodium complexes, a cis-square-planar configuration for the nickel, palladium and platinum complexes, and a tetrahedral configuration for the zinc complexes. The copper complexes have moments 0.5-1.0 D lower than the mean value for the corresponding nickel, palladium and platinum complexes; this lowering of the moment is attributed to significant distortion from the square-planar towards the tetrahedral configuration. The dipole moments of the square-planar and octahedral complexes decrease if the R groups are arranged in the order: p-MeC6H4 ≥ 2-thienyl > β-naphthyl > m-MeC6H4 > Ph > Pr? > Bui > Me > m-ClC6H4 > m-BrC6H4 > p-FC6H4 > p-ClC6H4 > p-BrC6H4 > m,p-Cl2C6H3.

Darstellung und Röntgenstrukturanalyse von (DichIoro)-(1,3,5,7-tetramethyI-2,4,6,8,9,10-hexathiaadamantan)palladium(II), PdCl2(CH3)4C4S6 Preparation and X-Ray Structure Analysis of (D ichloro)-(l,3,5,7-tetram ethyl-2,4,6,8,9,10-hexathiaadam antane)palladium (II), PdCl2(CH3)4C4S6

1986 ◽  
Vol 41 (4) ◽  
pp. 409-412 ◽  
Author(s):  
Joachim Pickardt ◽  
Norbert Rautenberg
Keyword(s):  
Structure Analysis ◽  
Palladium Complex ◽  
Bond Angle ◽  
Free Ligand ◽  
Lattice Parameters ◽  
Space Group ◽  
X Ray ◽  
Chelating Ligand ◽  
Square Planar

By reaction of PdCl2(C6H5CN) 2 with 1,3,5,7-tetram ethyl-2,4,6,8,9,10-hexathiaadam antane, (CH3)4C4S6, (“TMTA”), the complex PdCl2-TMTA could be obtained. X-ray structure analyses were performed for the free ligand TMTA as well as for the adduct. Both com pounds crystallize monoclinically, space group P21/n, lattice parameters for TMTA are a= 845.9(5), b= 1225.8(7), c= 1314.8(8) pm, ß= 93.28(5)°; for PdCl2-TMTA a= 1262.3(3), b= 1376.3(4), c= 939.1(3) pm, and ß= 92.86(5)°. In the palladium complex TMTA acts as a bidentate chelating ligand. The coordination about the Pd atom is approximately square planar, but the bond angle S -Pd -S is only 76.2°

Electronic structure of nitrogen square planar copper complexes in Langmuir-Blodgett films

1992 ◽  
Vol 96 (17) ◽  
pp. 7072-7075 ◽  
Author(s):  
Stephane Carniato ◽  
Henri Roulet ◽  
Georges Dufour ◽  
Serge Palacin ◽  
Andre Barraud ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Copper Complexes ◽  
Langmuir Blodgett ◽  
Square Planar ◽  
Langmuir Blodgett Films
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