scholarly journals Crystal structure of the [(1,3-dimesityl-1H-imidazol-3-ium-2-yl)methanolato]copper(II) chloride dimer: insertion of formaldehyde into a copper–carbene bond

2018 ◽  
Vol 74 (9) ◽  
pp. 1369-1372 ◽  
Author(s):  
Christopher A. Dodds ◽  
Alan R. Kennedy
Keyword(s):  
Crystal Structure ◽  
Central Core ◽  
Carbon Bond ◽  
Carbene Complex ◽  
Bond Lengths ◽  
Binuclear Molecule ◽  
Square Planar ◽  
Chloride Ligands ◽  
Planar Environment

The crystal structure of bis[μ-(1,3-dimesityl-1H-imidazol-3-ium-2-yl)methanolato-κ2 O:O]bis[dichloridocopper(II)], [Cu2Cl4(C22H26N2O)2], is reported. The complex is assumed to have formed via the insertion of formaldehyde into the copper–carbon bond in an N-heterocyclic carbene complex of copper(I) chloride. The structure of the binuclear molecule possesses a crystallographically centrosymmetric Cu2O2 central core with the O atoms bridging between the CuII atoms and thus Z′ = 0.5. The copper centres are further ligated by two chloride ligands, resulting in the CuII atoms residing in a distorted square-planar environment. The Cu—O bond lengths are shorter than those previously reported in structures with the same central Cu2O2 motif. The complex displays C—H...Cl interactions involving the H atoms of the heterocycle backbone and the chloride ligands of a neighbouring molecule.

scholarly journals Crystal structure of (N^C) cyclometalated AuIII diazide at 100 K

2020 ◽  
Vol 76 (11) ◽  
pp. 1725-1727
Author(s):  
Volodymyr Levchenko ◽  
Sigurd Øien-Ødegaard ◽  
David Wragg ◽  
Mats Tilset
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Azide Group ◽  
Bond Lengths ◽  
Square Planar ◽  
Out Of Plane ◽  
Planar Environment

The title compound, an (N^C)-cyclometalated gold(III) diazide, namely, diazido[5-ethoxycarbonyl-2-(5-ethoxycarbonylpyridin-2-yl)phenyl-κ2 C 1,N]gold(III), [Au(C17H16NO4)(N3)2] or Au(ppyEt)(N3)2, was synthesized by reacting Au(ppyEt)Cl2 with NaN3 in water for 24 h. The complex has been structurally characterized and features a gold center with a square-planar environment. The Au—N(azide) bond lengths are significantly different depending on the influence of the atom trans to the azide group [Au—N(trans to C) of 2.067 (2) Å versus Au—N(trans to N) of 2.042 (2) Å]. The azide groups are twisted in-and-out of plane by 56.2 (2)°.

scholarly journals Crystal structure of bis(2-{[(3-bromopropyl)imino]methyl}phenolato-κ2N,O)copper(II)

2015 ◽  
Vol 71 (2) ◽  
pp. m33-m34
Author(s):  
Ali Ourari ◽  
Chahinaz Zoubeidi ◽  
Sofiane Bouacida ◽  
Wassila Derafa ◽  
Hocine Merazig
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Title Compound ◽  
The Other ◽  
Asymmetric Unit ◽  
Bond Lengths ◽  
Π Interactions ◽  
Square Planar ◽  
Planar Environment

In the title compound, [Cu(C10H11BrNO)2], the asymmetric unit consists of one-half of the molecule, the other half being generated by an inversion centre. Hence the CuIIcation is symmetrically coordinated by two bidentate Schiff base anions in a slightly distorted square-planar environment with Cu—O and Cu—N bond lengths of 1.8786 (19) and 2.009 (2) Å, respectively. In the crystal, individual molecules are packed in alternating zigzag layers parallel to (001). Weak C—H...π interactions exist between the molecules.

scholarly journals Crystal structure of bis(2-{1-[(E)-(4-fluorobenzyl)imino]ethyl}phenolato-κ2N,O)palladium(II)

2015 ◽  
Vol 71 (4) ◽  
pp. 350-353
Author(s):  
Amalina Mohd Tajuddin ◽  
Hadariah Bahron ◽  
Hamizah Mohd Zaki ◽  
Karimah Kassim ◽  
Suchada Chantrapromma
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Hydrogen Bonds ◽  
Dihedral Angle ◽  
Title Complex ◽  
Asymmetric Unit ◽  
Schiff Base Ligands ◽  
Bond Lengths ◽  
Square Planar ◽  
Coordination Plane

The asymmetric unit of the title complex, [Pd(C15H13FNO)2], contains one half of the molecule with the PdIIcation lying on an inversion centre and is coordinated by the bidentate Schiff base anion. The geometry around the cationic PdIIcentre is distorted square planar, chelated by the imine N- and phenolate O-donor atoms of the two Schiff base ligands. The N- and O-donor atoms of the two ligands are mutuallytrans, with Pd—N and Pd—O bond lengths of 2.028 (2) and 1.9770 (18) Å, respectively. The fluorophenyl ring is tilted away from the coordination plane and makes a dihedral angle of 66.2 (2)° with the phenolate ring. In the crystal, molecules are linked into chains along the [101] direction by weak C—H...O hydrogen bonds. Weak π–π interactions with centroid–centroid distances of 4.079 (2) Å stack the molecules alongc.

scholarly journals Comparison of molecular structures of cis-bis[8-(dimethylphosphanyl)quinoline]nickel(II) and -platinum(II) complex cations

2020 ◽  
Vol 76 (12) ◽  
pp. 1813-1817
Author(s):  
Masatoshi Mori ◽  
Takayoshi Suzuki
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Steric Hindrance ◽  
Molecular Structures ◽  
Coordination Geometry ◽  
Donor Group ◽  
Bending Deformation ◽  
Bond Lengths ◽  
Square Planar ◽  
Chelate Ligands

The crystal structures of the complexes (SP-4-2)-cis-bis[8-(dimethylphosphanyl)quinoline-κ2 N,P]nickel(II) bis(perchlorate) nitromethane monosolvate, [Ni(C11H12NP)2](ClO4)2·CH3NO2 (1), and (SP-4-2)-cis-bis[8-(dimethylphosphanyl)quinoline-κ2 N,P]platinum(II) bis(tetrafluoroborate) acetonitrile monosolvate, [Pt(C11H12NP)2](BF4)2·C2H3N (2), are reported. In both complex cations, two phosphanylquinolines act as bidentate P,N-donating chelate ligands and form the mutually cis configuration in the square-planar coordination geometry. The strong trans influence of the dimethylphosphanyl donor group is confirmed by the Ni—N bond lengths in 1, 1.970 (2) and 1.982 (2) Å and, the Pt—N bond lengths of 2, 2.123 (4) and 2.132 (4) Å, which are relatively long as compared to those in the analogous 8-(diphenylphosphanyl)quinoline complexes. Mutually cis-positioned quinoline donor groups would give a severe steric hindrance between their ortho-H atoms. In order to reduce such a steric congestion, the NiII complex in 1 shows a tetrahedral distortion of the coordination geometry, as parameterized by τ4 = 0.199 (1)°, while the PtII complex in 2 exhibits a typical square-planar coordination geometry [τ4 = 0.014 (1)°] with a large bending deformation of the ideally planar Me2Pqn chelate planes. In the crystal structure of 2, three F atoms of one of the BF4 − anions are disordered over two sets of positions with refined occupancies of 0.573 (10) and 0.427 (10).

Purine complexes of platinum: synthesis, nmr, and crystal and molecular structures of cis-chloro(caffeine)bis(triethylphosphine)platinum(II) fluoroborate and cis-bis(isocaffeine)bis(triethylphosphine)platinum (II) fluoroborate

1983 ◽  
Vol 61 (6) ◽  
pp. 1132-1141 ◽  
Author(s):  
Gordon William Bushnell ◽  
Roderick James Densmore ◽  
Keith Roger Dixon ◽  
Arthur Charles Ralfs
Keyword(s):  
Crystal Structure ◽  
Nmr Spectra ◽  
Molecular Structures ◽  
Platinum Drugs ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Bond Lengths ◽  
Antitumour Agents ◽  
Crystal And Molecular Structures ◽  
Square Planar

Synthesis and 31P nmr spectra of the complex cations, cis-[PtCl(L)(PEt3)2]+, L= theophylline, caffeine, or isocaffeine, and cis[Pt(isocaff)2(PEt3)2]2+ are reported. The crystal structure of cis-[PtCl(caffeine)(PEt3)2][BF4] is determined, space group [Formula: see text], a = 1.1766(6), b = 1.4428(5), c = 0.9002(4) nm, α = 97.28(4)°, β = 97.69(4)°, γ = 100.96(5)°, Dm = 1.649 g cm−1, the bond lengths are Pt—Cl= 233.4(4) pm, Pt—N = 215(1) pm, Pt—P = 225.4(5) pm (mean), and the residual R = 0.071. The crystal structure of cis-[Pt(isocaffeine)2(PEt3)2][BF4]2 is orthorhombic, space group Pbca, a = 2.317(3), b = 1.717(3), c = 2.130(3) nm, Dm = 1.574 g cm−3, with an opposing isocaffeine conformation, bond lengths Pt—N = 211(2) pm, Pt—P = 227.6(9) pm (mean), and R = 0.073. Both crystal structures contain approximately square planar Pt(II) coordination with the purine coordinated via an imidazole nitrogen. The structures are discussed as models for the possible involvement of [Formula: see text] chelation of guanine to platinum when platinum drugs act as antitumour agents, but there is no evidence that isocaffeine acts as an [Formula: see text] chelate.

scholarly journals A new compound in the BEDT-TTF family [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene] with a tetrathiocyanatocuprate(II) anion, (BEDT-TTF)4[Cu(NCS)4]

2018 ◽  
Vol 74 (12) ◽  
pp. 1755-1758 ◽  
Author(s):  
Christophe Faulmann ◽  
Benoît Cormary ◽  
Lydie Valade ◽  
Kane Jacob ◽  
Dominique de Caro
Keyword(s):  
Crystal Structure ◽  
Counter Anion ◽  
Bond Lengths ◽  
Square Planar ◽  
New Phase ◽  
Positively Charged

A new phase combining BEDT-TTF and [Cu(NCS)4]2– as the counter-anion, namely bis[bis(ethylenedithio)tetrathiafulvalenium] tetrathiocyanatocuprate(II) bis[bis(ethylenedithio)tetrathiafulvalene], (C10H8S8)2[Cu(NCS)4]·2C10H8S8 or (BEDT-TTF)4[Cu(NCS)4] was obtained during a galvanostatic electrocrystallization process. As previously observed with BEDT-TTF-based compounds with oxalatometallate anions, the BEDT-TTF molecules in (BEDT-TTF)4[Cu(NCS)4] exhibit the so-called pseudo-κ arrangement, with two BEDT-TTF molecules being positively charged and two electronically neutral. The bond lengths and angles in the two unique BEDT-TTF molecules differ slightly. The crystal structure consists of layers of BEDT-TTF molecules extending parallel to (001). The width of this layer corresponds to the length of the a axis [16.9036 (17) Å]. The BEDT-TTF layers are separated by layers of centrosymmetric square-planar [Cu(NCS)4]2– dianions.

Crystal structures of [SbF6]− salts of di- and tetrahydrated Ag +, tetrahydrated Pd2 + and hexahydrated Cd2 + cations

2017 ◽  
Vol 232 (5) ◽  
pp. 339-347 ◽  
Author(s):  
Zoran Mazej ◽  
Evgeny Goreshnik
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Crystal Structures ◽  
Water Molecules ◽  
Bond Lengths ◽  
Square Planar ◽  
Oxygen Atoms

AbstractThe [Ag(H2O)2]SbF6, is triclinic, P1̅ (No. 2), with a=6.6419(3) Å, b=7.6327(3) Å, c=11.1338(3) Å, α=95.492(3)°, β=96.994(3)°, γ=113.535(4)°, V=507.13(4) Å3 at 150 K, and Z=3. There are two crystallographically non-equivalent Ag+ cations. The Ag1 is coordinated by two water molecules with Ag–OH2 distances equal to 2.271(2) Å forming in that way a discrete linear [Ag(H2O)2]+ cation. Additionaly, it forms two short Ag···F contacts (2.630(2) Å), resulting in AgO2F2 plaquette, and four long ones (2×3.001(2) Å and 2×3.095(2) Å) with fluorine atoms located below and above the AgO2F2 plaquette. The H2O molecules bridge Ag2 atoms into {–[Ag(μ-OH2)2]–}n infinite chains, with Ag–O distances of 2.367(2)–2.466(2) Å. The [Pd(H2O)4](SbF6)2·4H2O is monoclinic, P21/a (No.14), with a=8.172(2) Å, b=13.202(3) Å, c=8.188(3) Å, β=115.10(1)o, V=799.9(4) Å3 at 200 K, and Z=2. Its crystal structure can be described as an alternation of layers of [Pd(H2O)4]2+ cations (interconnected by H2O molecules) and [SbF6]− anions. It represents the first example where [Pd(H2O)4]2+ has been structurally determined in the solid state. Four oxygen atoms provided by H2O molecules are in almost ideal square-planar arrangement with Pd–O bond lengths 2×2.004(5) Å and 2×2.022(6) Å. The [Cd(H2O)6](SbF6)2, is orthorhombic, Pnnm (No.58), with a=5.5331(2) Å, b=14.5206(4) Å, c=8.9051(3) Å, V=715.47(4) Å3 at 200 K, and Z=2. It consists of [Cd(H2O)6]2+ cations and [SbF6]− anions.

scholarly journals cis-Dichlorido(dimethyl sulfoxide-κS)(N,N,N′,N′-tetramethylguanidine-κN′′)platinum(II)

2013 ◽  
Vol 69 (2) ◽  
pp. m117-m118 ◽  
Author(s):  
Ivan I. Eliseev ◽  
Nadezhda A. Bokach ◽  
Matti Haukka ◽  
Irina A. Golenya
Keyword(s):  
Hydrogen Bond ◽  
Dimethyl Sulfoxide ◽  
Title Compound ◽  
Planar Geometry ◽  
Imino Group ◽  
Bond Lengths ◽  
Square Planar ◽  
Chloride Ligands ◽  
Neighboring Molecule ◽  
Sulfoxide Group

In the title compound,cis-[PtCl2(C5H13N3)(C2H6OS)], the four-coordinate PtIIatom is bonded to one N atom of theN,N,N′,N′-tetramethylguanidine ligand, one dimethyl sulfoxide S atom and two chloride ligands, forming acis-square-planar geometry. The bond lengths and angles of the N—Pt—Cl functionality are typical for imine dichloridoplatinum(II) complexes. The H atom of the imino group is oriented towards the O atom of the sulfoxide group of a neighboring molecule and forms an N—H...O hydrogen bond.

scholarly journals Crystal structure of a polymorph of μ-oxido-bis[(5,10,15,20-tetraphenylporphyrinato)iron(III)]

2019 ◽  
Vol 75 (6) ◽  
pp. 930-933
Author(s):  
Morten K. Peters ◽  
Christian Näther ◽  
Rainer Herges
Keyword(s):  
Crystal Structure ◽  
Coordination Sphere ◽  
Title Compound ◽  
Polymorphic Modification ◽  
Private Communication ◽  
Apical Position ◽  
Acta Cryst ◽  
Square Planar ◽  
Planar Environment

The title compound, [Fe2(C44H28N4O)2O], was obtained as a by-product during the synthesis of FeIII tetraphenylporphyrin perchlorate. It crystallizes as a new polymorphic modification in addition to the orthorhombic form previously reported [Hoffman et al. (1972). J. Am. Chem. Soc. 94, 3620–3626; Swepston & Ibers (1985) Acta Cryst. C41, 671–673; Kooijmann et al. (2007). Private Communication (refcode 667666). CCDC, Cambridge, England]. In its crystal structure, the two crystallographically independent FeIII cations are coordinated in a square-planar environment by the four N atoms of a tetraphenylporphyrin ligand. The FeIII-tetraphenylporphyrine units are linked by a μ2-oxido ligand into a dimer with an Fe—O—Fe angle close to linearity. The final coordination sphere for each FeIII atom is square-pyramidal with the μ2-oxido ligand in the apical position. The crystal under investigation consisted of two domains in a ratio of 0.691 (3): 0.309 (3).

scholarly journals Crystal structure of dichloridobis(methyl isonicotinate-κN)copper(II)

2015 ◽  
Vol 71 (5) ◽  
pp. m112-m113
Author(s):  
Elaheh Ahadi ◽  
Hassan Hosseini-Monfared ◽  
Peter Mayer
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Edge Sharing Octahedra ◽  
Square Planar ◽  
Chloride Ligands

In the title compound, [CuCl2(C7H7NO2)2], the square-planar-coordinated CuIIion lies on a centre of symmetry and is bonded to two monodentate methylisonicotinate ligands through their N atoms and by two chloride ligands. The molecules pack in a herringbone pattern. Perpendicular to [100] there are weak intermolecular C—H...Cl and C—H...O contacts. Along [100] there are infinite chains of edge-sharing octahedra linked through the chlorido ligands

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