Palladium(II) Complexes of Tridentate Ligands. The Crystal Structure of Chloro[2,6-di(2-imidazolin-2-yl)pyridine]palladium(II) Chloride

1991 ◽  
Vol 44 (12) ◽  
pp. 1659 ◽  
Author(s):  
AT Baker ◽  
DC Craig ◽  
P Singh
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Water Molecule ◽  
Complex Cation ◽  
Chloride Ions ◽  
Orthorhombic Space Group ◽  
Tridentate Ligands ◽  
X Ray ◽  
Square Planar ◽  
Bonding Scheme

Mono(ligand) palladium(II) complexes of 2,6-di-(thiazol-2-yl)pyridine (1a), 2,6-di(4-methylthia-zol-2-yl)pyridine (1b), 2,6-di(thiazol-4-yl)pyridine (2a), 2,6-di(imidazolin-2-yl]pyridine (3) and 2,6-di(benzimidazol-2-yl)pyridine (4a) of the general formula [ PdLCl ] Cl have been prepared. Stoichiometries have been confirmed by C, H, N and Pd analyses; the presence of solvate molecules has been confirmed by thermogravimetry . The crystal structure of [ PdLCl ]Cl.H2O, L = (3), has been determined by single-crystal X-ray diffractometry. The compound crystallizes in an orthorhombic space group, Pna21, a 7.427(2), b 21.932(3), c 8.935(1)Ǻ. The geometry of the complex cation is approximately square planar. The imidazolinyl rings closely approach planarity which is imposed by the delocalization of π-density in the NCN moiety. A hydrogen-bonding scheme involving the imino hydrogens of the ligand, chloride ions and the water molecule is present. The structure was refined by least-squares methods to a residual of 0.018 for 1273 reflections.

The molecular and crystal structure of [Pt(diethylenetriamine)(guanosine)](ClO4)2

1979 ◽  
Vol 57 (1) ◽  
pp. 57-61 ◽  
Author(s):  
R. Melanson ◽  
F. D. Rochon
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Least Squares ◽  
Platinum Atom ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
R Factor ◽  
Square Planar ◽  
Coordination Plane

The crystal structure of [Pt(diethylenetriamine)(guanosine)](ClO4)2 has been determined by X-ray diffraction. The crystals are orthorhombic, space group P212121, with a = 12.486(6), b = 13.444(7), c = 14.678(11) Å, and Z = 4. The structure was refined by block-diagonal least-squares analysis to a conventional R factor of 0.050 and a weighted Rw = 0.045.The coordination around the platinum atom is square planar. Guanosine is bonded to platinum through N(7). The purine planar ring makes an angle of 62.7° with the platinum coordination plane. The structure is stabilized by hydrogen bonding.

scholarly journals Crystal structure ofcis-bis(μ-β-alanine-κ2O:O′)bis[trichloridorhenium(III)](Re–Re) sesquihydrate

2015 ◽  
Vol 71 (1) ◽  
pp. 45-47 ◽  
Author(s):  
Alexander A. Golichenko ◽  
Konstantin V. Domasevitch ◽  
Dina E. Kytova ◽  
Alexander V. Shtemenko
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Water Molecule ◽  
Title Compound ◽  
Complex Cation ◽  
Site Occupancy ◽  
Chloride Ions ◽  
Water Molecules ◽  
Complex Molecules ◽  
A Site

The structure of the title compound, [Re2Cl6(C3H7NO2)2]·1.5H2O, comprises a dinuclear complex cation [Re—Re = 2.2494 (3) Å] involvingcis-oriented double carboxylate bridges, four equatorial chloride ions and two weakly bonded chloride ligands in the axial positions at the two rhenium(III) atoms. In the crystal, two complex molecules and two water molecules constitute hydrogen-bonded dimers, while an extensive hydrogen-bonding network involving the groups of the zwitterionic ligand is important for generation of the framework. An additional partially occupied water molecule is disordered over two sets of sites about a symmetry centre with a site-occupancy ratio of 0.3:0.2.

Crystal Structure, Spectroscopic and Redox Properties of Copper(II) Bis{2-[(2,6-dimethylphenyl)iminomethyl-3-methoxyphenolate]}

2007 ◽  
Vol 62 (9) ◽  
pp. 1133-1138 ◽  
Author(s):  
Veli T. Kasumov ◽  
Ibrahim Uçar ◽  
Ahmet Bulut ◽  
Fevzi Kösal
Keyword(s):  
Crystal Structure ◽  
Title Complex ◽  
Redox Properties ◽  
Orthorhombic Space Group ◽  
Long Distance ◽  
X Ray ◽  
X Ray Crystallography ◽  
Square Planar ◽  
Planar Molecules ◽  
Exchange Interaction Parameter

The coordination chemistry of N-(2,6-di-methylphenyl)-2-hydroxy-3-methoxybenzaldimine (1) with Cu(II) has been investigated by X-ray crystallography, electronic and EPR spectroscopies, as well as by electro- and magnetochemistry. The title complex 2 crystallizes in the orthorhombic space group P212121 (a = 8.1538, b = 17.7466, c =19.8507 Å). The mononuclear square-planar molecules 2 featuring trans-N2O2 coordination are connected via weak intermolecular C-H· · ·π interactions into infinite chains parallel to the a axis. Although the intermolecular Cu· · ·Cu separations within individual chains and between chains are very long (8.154 and 9.726 Å ), the exchange interaction parameter G = 2.03 < 4, estimated from solid state EPR spectra, suggests the existence of long-distance superexchange pathways between adjacent Cu(II) centers. The electronic and electrochemical features of the compound are also discussed.

The X-ray crystal structure of N-(1-octyl)-d-talonamide and a consideration of its hydrogen-bonding scheme

1993 ◽  
Vol 240 ◽  
pp. 47-56 ◽  
Author(s):  
Christoph André ◽  
Peter Luger ◽  
Sönke Svenson ◽  
Jürgen-Hinrich Fuhrhop
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
X Ray ◽  
Bonding Scheme

Dendocarbin A: a sesquiterpene lactone fromDrimys winteri

2014 ◽  
Vol 70 (11) ◽  
pp. 1007-1010 ◽  
Author(s):  
Cristian Paz Robles ◽  
Viviana Burgos ◽  
Sebastián Suarez ◽  
Ricardo Baggio
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Sesquiterpene Lactone ◽  
Natural Compound ◽  
Intermolecular Hydrogen Bonding ◽  
Screw Axis ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
First Time ◽  
Drimys Winteri

The natural compound dendocarbin A, C15H22O3, is a sesquiterpene lactone isolated for the first time fromDrimys winterifor var chilensis. The compound crystallizes in the orthorhombic space groupP212121and its X-ray crystal structure confirmed theS/Rcharacter of the chiral centres at C-5/C-10 and C-9/C-11, respectively. The α-OH group at C-11 was found to be involved in intermolecular hydrogen bonding, defining chains along the <100> 21screw axis.

scholarly journals Zur Stereochemie des freien Elektronenpaares in AX6E-Systemen, IX+ Statisch verzerrtes Anion in [(CH3)2HN(C6H4)NH(CH3)2]TeCl6 / On the Stereochemistry of the Lone-Pair Electrons in AX6E-Systems, IX+ Statically Distorted Anion in [(CH3)2HN(C6H4)NH(CH3)2]TeCl6

1990 ◽  
Vol 45 (5) ◽  
pp. 573-578 ◽  
Author(s):  
André du Bois ◽  
Walter Abriel
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Single Crystal ◽  
Lone Pair ◽  
Intensity Data ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray ◽  
Lone Pair Electrons ◽  
Symmetry Rules

Using 293 K diffractometer intensity data, the crystal structure of [(CH3)2HN(C6H4)NH(CH3)2]TeCl6 has been determined by single crystal X-ray technique and refined to a final Rw of 0.022. The yellow crystals are orthorhombic, space group Pna 21, with a = 17.565(2), b = 8.4496(6), c = 12.572(1) Å and Z = 4. The TeCl62- anions show a strong statical distortion with Te—Cl distances from min. 2.39 to max. 2.78 A. The symmetry rules for the stereochemistry of the lone pair electrons in AX6E-systems are confirmed. The influence of hydrogen bonding on the type of distortion is also discussed.

scholarly journals Crystal structure of μ-fluorido-bis{(η4-cyclooctadiene)[hexafluoridoantimonato(V)]platinum(II)} hexafluoridoantimonate(V) hydrogen fluoride 0.75-solvate

2016 ◽  
Vol 72 (1) ◽  
pp. 14-16
Author(s):  
Konrad Seppelt ◽  
Roland Friedemann
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Hydrogen Fluoride ◽  
Bond Angle ◽  
Complex Cation ◽  
Three Dimensional ◽  
The Third ◽  
Hydrogen Bonding Interactions ◽  
Square Planar ◽  
Solvent Molecules

In the complex cation of the binuclear solvated title salt, [Pt2F(SbF6)2(C8H12)2]SbF6·0.75HF, an F atom bridges the two platinum(II) atoms with a bond angle of 123.3 (2)°. The corresponding Pt—F bond lengths are in the range of other fluorine-bridged binuclear platinum(II) complexes. Two of the three SbF6−anions each coordinate with one F atom to one platinum(II) atom. Including the η4-bound cyclooctadiene (COD) ligands, the overall coordination sphere of each platinum(II) atom is square-planar. The third SbF6−anion is not bound to the complex. Hydrogen fluoride is present in the crystal structure as a solvent disordered over three positions, each with an occupancy of 0.25. F...F distances of 2.5512 (7), 2.6076 (8) and 3.2215 (10) Å to surrounding SbF6−anions are indicative of F—H...F hydrogen-bonding interactions although no H atoms could be localized for the disordered solvent molecules. The resulting hydrogen-bonded network is three-dimensional.

Interaction between Acetyltetralone and Cu(II) Ions: X-Ray Diffraction of the Ligand and Single Crystal ESR Study of the Complex

1983 ◽  
Vol 38 (7) ◽  
pp. 830-834 ◽  
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Single Crystals ◽  
Structure Study ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
Crystal Matrix ◽  
Present Complex ◽  
Square Planar

Abstract Single crystals of acetyltetralone grown from a solution containing a small amount of Cu(II) ions are studied by ESR. The corresponding g, 63Cu magnetic and quadrupolar hyperfine tensors are obtained and are consistent with the trapping of a square planar copper(II) complex. X-ray diffraction shows that pure acetyltetralone crystallizes in the orthorhombic space group Pbca (a - 8.893 Å, b = 20.301 Å, c = 10.715 Å). Comparison of the ESR eigenvectors with the bond directions obtained from this crystal structure study shows that the Cu(II) complex experiences some constraint from the crystal matrix. The present complex is a model for one of the complexation sites of tetracyclines.

Crystal Structure of Dibromo(η4-1,5-cyclooctadiene)palladium(II)

1996 ◽  
Vol 61 (9) ◽  
pp. 1335-1341 ◽  
Author(s):  
Petr Štěpnička ◽  
Ivana Císařová
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Single Crystal ◽  
Boat Conformation ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray ◽  
Square Planar ◽  
Twisted Boat

The crystal structure of [(η4-C8H12)PdBr2] has been determined by a single crystal X-ray diffraction with R = 3.82% for 2 147 independent diffractions. The compound crystallizes with the symmetry of orthorhombic space group P212121 (No. 19) within the following parameters: a = 7.0785(5) Å, b = 11.1896(9) Å, c = 12.514(1) Å, V = 991.2(1) Å3, Z = 4. The square planar arrangement of ligands around Pd(II) is distorted due to the steric requirements of 1,5-cyclooctadiene in a twisted boat conformation. Formula units are joined by the weak C2-H2...Br1(1 + x, y, z) hydrogen bonds.

scholarly journals Synthesis and crystal structure of dichlorido(1,10-phenanthroline-κ2N,N′)gold(III) hexafluoridophosphate

2017 ◽  
Vol 73 (7) ◽  
pp. 1048-1051 ◽  
Author(s):  
Raphael Enoque Ferraz de Paiva ◽  
Douglas Hideki Nakahata ◽  
Pedro Paulo Corbi
Keyword(s):  
Crystal Structure ◽  
Crystal Packing ◽  
Chloride Ions ◽  
Mass Spectrometric ◽  
Spectrometric Analysis ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Square Planar ◽  
Phenanthroline Ligand

A gold(III) salt of composition [AuCl2(C12H8N2)]PF6was prepared and characterized by elemental and mass spectrometric analysis (ESI(+)–QTOF–MS),1H nuclear magnetic resonance measurements and by single-crystal X-ray diffraction. The square-planar coordination sphere of AuIIIcomprises the bidentate 1,10-phenanthroline ligand and two chloride ions, with the AuIIIion only slightly shifted from the least-squares plane of the ligating atoms (r.m.s. = 0.018 Å). In contrast to two other previously reported AuIII-phenantroline structures that are stabilized by interactions involving the chlorido ligands, the packing of the title compound does not present these features. Instead, the hexafluoridophosphate counter-ion gives rise to anion...π interactions that are a crucial factor for the crystal packing.

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