Crystal structures of (azido)(pentamethylcyclopentadienyl)iridium(III) complexes containing various types of bidentate ligands

Polyhedron ◽  
2009 ◽  
Vol 28 (11) ◽  
pp. 2287-2293 ◽  
Author(s):  
Takayoshi Suzuki ◽  
Mai Kotera ◽  
Asuka Takayama ◽  
Masaaki Kojima
Keyword(s):  
Crystal Structures ◽  
Bidentate Ligands

Importance of chelate–chelate stacking interactions in crystal structures of square pyramidal copper(II) complexes with two distinct chelating bidentate ligands

2016 ◽  
Vol 442 ◽  
pp. 16-23 ◽  
Author(s):  
Satavisha Bhattacharya ◽  
Sumit Roy ◽  
Klaus Harms ◽  
Antonio Bauza ◽  
Antonio Frontera ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Stacking Interactions ◽  
Bidentate Ligands

Structural and spectroscopic studies of transition metal nitrite complexes. X. Crystal structures of cis-Bis(2,2'-bipyridine)(nitrito-O,O')nickel(II) nitrate and hydrated Tris(2,2'-bipyridine)nickel(II) nitrite/nitrate and sulfate. Stereochemistry of the [M(bidentate ligand)2(bidentate ligand')1] system

1981 ◽  
Vol 34 (10) ◽  
pp. 2177 ◽  
Author(s):  
AJ Finney ◽  
MA Hitchman ◽  
DL Kepert ◽  
CL Raston ◽  
GL Rowbottom ◽  
...  
Keyword(s):  
Transition Metal ◽  
Crystal Structures ◽  
Coordination Sphere ◽  
Nickel Atom ◽  
Spectroscopic Studies ◽  
Bidentate Ligand ◽  
The Other ◽  
Bidentate Ligands ◽  
Nitrite Nitrate ◽  
Oxygen Atoms

The crystal structures of the title compounds are reported. In all cases, the coordination sphere of the nickel atom comprises three bidentate ligands. In (1), [Ni(bpy)2(O2N)] NO3, (Ni-N) is 2.M2 � although there are small differences between those nitrogen atoms trans to the nitrite oxygen atoms and the other two. (Ni-O) is 2.12 �. In (2), [Ni(bpy)3] NO2/NO3,xH2O, and (3), [Ni(bpy)3]- SO4,7.5H2O, a redetermination, Ni-N is shown to be c. 2.09 �; serious disorder is present among the non-cationic components of (2), precluding a definite assignment of stoichiometry.

Complexes with New Chelate Anionic Ligands Formed by Nucleophilic Addition in Copper(II) Coordination Sphere. III. The Crystal Structures of (2,2'-Bipyridine-N,N')(cyanato-N)[methyl(2-cyano-2-imidoxy Ethaneimidate-N,N')]copper(II) and (2,2'-Bipyridine-N,N')(2-cyano-2-imidoxy Ethaneimidate-N,N')copper(II)

1999 ◽  
Vol 64 (4) ◽  
pp. 600-612 ◽  
Author(s):  
Michal Dunaj-Jurčo ◽  
Ivan Potočňák ◽  
Dušan Mikloš ◽  
Robert Klement
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Coordination Polyhedron ◽  
Nucleophilic Addition ◽  
Bidentate Ligands ◽  
Hydroxide Ion ◽  
Coordination Polyhedra ◽  
Anionic Ligands ◽  
Distorted Trigonal Bipyramid ◽  
Bonding Systems

Crystal structures of Cu(II) compounds with new chelate anionic ligands are presented. The formulae of these compounds are [Cu(bipy)(mcoe)(NCO)] (1) and [Cu(bipy)(coe)] (2), where bipy is 2,2'-bipyridine, mcoe and coe are the anionic chelate ligands methyl(2-cyano-2-imidoxy ethaneimidate), [(ON)(NC)C-C(NH)(OCH3)]1- (3), and 2-cyano-2-imidoxy ethaneimidate, [(ON)(NC)C-C(NH)(O)]2- (4), respectively, formed by nucleophilic addition of methanol and hydroxide ion to the coordinatively activated β-carbon of the nitroso-dicyanomethanide. Formation of the hydroxide ion from water in the reaction mixture can be explained by protonation of the C(CN)3- anion. The coordination polyhedra in 1 and 2 are quite different. The coordination polyhedron around the Cu(II) ion in 1 is a distorted trigonal bipyramid and in 2 a distorted square. The Cu(II) ion in 1 is coordinated by four N atoms from two bidentate ligands and one N atom from the NCO- group. The crystal structure consists of discrete molecules with {CuN5} chromophore. On the other hand, the Cu(II) ion in 2 is coordinated by four N atoms from two bidentate ligands in square coordination and the molecules are linked by weaker contacts between copper and oxygen atoms (Cu-O1i = 2.503(3), Cu-O2ii = 2.801(3) Å; i = -x, -y, -z + 1; ii = -x + 1, -y, -z + 1) to infinite chains parallel with c. Thus the coordination polyhedron is completed to an elongated tetragonal bipyramid with the {CuN4O*O*} chromophore. The angle O1i-Cu-O2ii is 167.9(1)° and the crystal structure cannot be considered as molecular but consisting of chains running in one direction. Inspection of the bond distances in mcoe and coe indicates strongly delocalized π-bonding systems. This is also supported by the fact that the anions are almost planar with bond angles close to 120°. The calculated Wiberg (bond-order) indices show that due to conjugation, the bonds within the metallocycle in mcoe and coe exhibit partially multiple character.

scholarly journals Metallkomplexe mit Hexamethylentetramin als Ligand, V II [1] Kristallstrukturen des Zinkchlorid-Adduktes ZnCl2 • C6H12N4 und des Zinkbromid-Adduktes ZnBr2-C6H12N4 / Metal Complexes with Hexamethylenetetramine as a Ligand, V II [1] Crystal Structures of the Zinc Chloride Adduct ZnCl2 • C6H12N4, and the Zinc Bromide Adduct ZnBr2 • C6H12N4

1985 ◽  
Vol 40 (12) ◽  
pp. 1756-1758 ◽  
Author(s):  
Joachim Pickardt ◽  
Pamela Droas
Keyword(s):  
Metal Complexes ◽  
Crystal Structures ◽  
Zinc Chloride ◽  
Standard Setting ◽  
Lattice Parameters ◽  
Bidentate Ligands ◽  
Orthorhombic Space Group ◽  
Zinc Bromide ◽  
Space Group ◽  
Chloride Adduct

Abstract By reaction of zinc chloride and zinc bromide with hexamethylenetetramine in water/methanol crystals of the adducts ZnCl2 • C6H12N4 and ZnBr2 • C6H12N4, resp. were obtained. The compounds are isotypic, they crystallize in the orthorhombic space group P21am (non-standard setting of space group Pmc21, No. 26), Z = 2. The lattice parameters of the zinc chloride adduct are a = 1168.0(4), b = 685.7(4), and c = 601.1(4) pm, of the zinc bromide adduct a - 1188.9(6), b = 721.5(5), and c = 602.3(4) pm. The adducts are polymeric, they form parallel chains in the crystal. The zinc atoms are bonded to two halogen atoms and, via nitrogen atoms, to two hexamethylenetetramine molecules, which act as bidentate ligands. The coordination of the zinc atoms is approximately tetrahedral

scholarly journals Crystal structures of the penta- and hexahydrate of thulium nitrate

2020 ◽  
Vol 76 (12) ◽  
pp. 1863-1867
Author(s):  
Wilhelm Klein
Keyword(s):  
Rare Earth ◽  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Water Molecules ◽  
Nitrate Hexahydrate ◽  
Bidentate Ligands ◽  
Crystal Water ◽  
Rare Earth Nitrate ◽  
Concentrated Solution ◽  
Nitrate Anions

Tm(NO3)3·5H2O and Tm(NO3)3·6H2O, or more precisely [Tm(NO3)3(H2O)4]·H2O and [Tm(NO3)3(H2O)4]·2H2O, respectively, have been obtained from a concentrated solution of Tm2O3 in HNO3. The crystal structures of the two hydrates show strong similarities as both crystallize in space group P\overline{1} with all atoms at general positions and contain neutral, molecular [Tm(NO3)3(H2O)4] complexes, i.e. ten-coordinated TmIII cations with three nitrate anions as bidentate ligands and four coordinating water molecules, and one or two additional crystal water molecules, respectively. All building units are connected by medium–strong to weak O—H...O hydrogen bonds. Tm(NO3)3·6H2O represents the maximally hydrated thulium nitrate as well as the heaviest rare earth nitrate hexahydrate known to date.

scholarly journals Selenoantimonate: Darstellung und Struktur von Na3SbSe4, K3SbSe4 und [Ba(en)4]2[Ba(en)3](SbSe4)2/ Selenoantimonates(V): Preparation and Crystal Structure of Na3SbSe4, K3SbSe4 and [Ba(en)4]2[Ba(en)3](SbSe4)2

1989 ◽  
Vol 44 (3) ◽  
pp. 249-256 ◽  
Author(s):  
Brigitte Eisenmann ◽  
Roland Zagler
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Structure Type ◽  
Bidentate Ligands ◽  
Space Group ◽  
Type K

Abstract The crystal structures of Na3SbSe4, K3SbSe4 and [Ba(en)4]2[Ba(en)3](SbSe4)2 contain isolated tetrahedral anions SbSe43-, which are the first examples of selenoantimonates(V). Na3SbSe4 (space group 143m , a = 750.1(2) pm, Z = 2) is an isotype of the (NH4)3SbS4-structure type; K3SbSe4 (space group R3c, a = 1137.5(4) pm, c = 1359.6(4) pm, Z = 6) forms a slightly distorted variant. In the crystal structure of [Ba(en)4]2[Ba(en)3](SbSe4)2 (space group P21, a = 965.8(4) pm, b = 1764.8(8) pm, c = 1463.2(6) pm, β = 90.8(1)°, Z = 2) the cations are in six- and eight-fold coordinations by the bidentate ligands.

scholarly journals Synthesis and crystal structures of tetrameric [2-(4,4-dimethyl-2-oxazolin-2-yl)anilido]sodium and tris[2-(4,4-dimethyl-2-oxazolin-2-yl)anilido]ytterbium(III)

2020 ◽  
Vol 76 (5) ◽  
pp. 703-709
Author(s):  
Leah Gajecki ◽  
Brendan Twamley ◽  
David J. Berg
Keyword(s):  
Crystal Structures ◽  
The Other ◽  
Polymeric Chain ◽  
Direct Reaction ◽  
Bidentate Ligands ◽  
Subsequent Reaction ◽  
Pale Yellow ◽  
Excellent Yield ◽  
Bite Angle ◽  
Moderate Yield

Reaction of 2-(4,4-dimethyl-2-oxazolin-2-yl)aniline (H2-L1) with one equivalent of Na[N(SiMe3)2] in toluene afforded pale-yellow crystals of tetrameric poly[bis[μ3-2-(4,4-dimethyl-2-oxazolin-2-yl)anilinido][μ2-2-(4,4-dimethyl-2-oxazolin-2-yl)aniline]tetrasodium(I)], [Na4(C11H13N2O)4] n or [Na4(H-L1)4] n (2), in excellent yield. Subsequent reaction of [Na4(H-L1)4] n (2) with 1.33 equivalents of anhydrous YbCl3 in a 50:50 mixture of toluene–THF afforded yellow crystals of tris[2-(4,4-dimethyl-2-oxazolin-2-yl)anilinido]ytterbium(III), [Yb(C11H13N2O)3] or Yb(H-L1)3 (3) in moderate yield. Direct reaction of three equivalents of 2-(4′,4′-dimethyl-2′-oxazolinyl)aniline (H2-L1) with Yb[N(SiMe3)2]3 in toluene resulted in elimination of hexamethyldisilazane, HN(SiMe3)2, and produced Yb(H-L1)3 (3) in excellent yield. The structure of 2 consists of tetrameric Na4(H-L1)4 subunits in which each Na+ cation is bound to two H-L1 bridging bidentate ligands and these subunits are connected into a polymeric chain by two of the four oxazoline O atoms bridging to Na+ cations in the adjacent tetramer. This results in two 4-coordinate and two 5-coordinate Na+ cations within each tetrameric unit. The structure of 3 consists of a distorted octahedron where the bite angle of ligand L1 ranges between 74.72 (11) and 77.79 (11) degrees. The oxazoline (and anilide) N atoms occupy meridional sites such that for one ligand an anilide nitrogen is trans to an oxazoline nitrogen while for the other two oxazoline N atoms are trans to each other. This results in a significantly longer Yb—N(oxazoline) distance [2.468 (3) Å] for the bond trans to the anilide compared to those for the oxazoline N atoms trans to one another [2.376 (3), 2.390 (3) Å].

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