Metallomesogens by ligand design

Date, Richard W.; Iglesias, Eva Fernandez; Rowe, Kathryn E.; Elliott, J. Michael; Bruce, Duncan W.

doi:10.1039/b212610a

Cited by 130 publications

(71 citation statements)

References 90 publications

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“…In this context, aromatic carboxylate ligands, and especially N-heterocyclic carboxylates, have been intensively studied for their versatile coordination modes and potential applicability to different fields, pharmaceutical, catalyst and magnetic properties and others. These studies are extensively reported in the literature [1][2][3][4][5][6][7][8]. As a part of our continuing investigations on inorganic-organic hybrid compounds containing zinccarboxylate systems, the title complex was synthesized.…”

Section: Discussionmentioning

confidence: 99%

Crystal structure of diaqua-bis(3-oxo-3,4-dihydroquinoxaline-2-carboxylato-κ2N,O)-zinc(II)-methanol-water (1:1:1), [Zn(C9H5N2O3)2(H2O)2]·CH3OH·H2O, C19H20N4O10Zn

Xiao

2013

Zeitschrift Für Kristallographie - New Crystal Structures

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Source of materialThe title compound was synthesized by adding the CH 3 OH solution (6 mL) of 3-hydroxy-2-quinoxalinecarboxylic acid (0.5 mmol) dropwise to a stirred water solution (4 mL) of Zn(CH 3 COO) 2 ·2H 2 O (0.5 mmol) at 298 K. Then the reaction mixture was filtered and the filtrate stood for about two weeks until the colourless block-shaped crystals were obtained. The crystals suitable for X-ray diffraction were collected by filtration, washed with water and ethanol and dried in air (47 % yield based on Zn). Elemental analysis calcd. for (C 19 Experimental detailsAll the hydrogen atoms were included in calculated positions and treated as riding on the parent atom with DiscussionThe research in coordination chemistry has grown progressively during the last decades. The potential application of hybrid ligands which permits to connect organic molecules to metals by two different heteroatoms (N, S, O, P, etc.) to form metallocycles has focused much interest. It is well known that the relationship between the steric and electronic preferences to metal ion and the coordination properties of the ligand plays an important role in the structure of the compounds. In this context, aromatic carboxylate ligands, and especially N-heterocyclic carboxylates, have been intensively studied for their versatile coordination modes and potential applicability to different fields, pharmaceutical, catalyst and magnetic properties and others. These studies are extensively reported in the literature [1][2][3][4][5][6][7][8]. As a part of our continuing investigations on inorganic-organic hybrid compounds containing zinccarboxylate systems, the title complex was synthesized. The crystal structure of the title complex consists of the mononuclear zinc(II) unit [Zn(C 9 H 5 N 2 O 3 ) 2 (H 2 O) 2 ], one free methanol molecule and one lattice water molecule. The zinc(II) atom is located on an inversion center and is six-coordinated by two carboxylate oxygen atoms and two N donors from two different 3-oxo-3,4-dihydroquinoxaline-2-carboxylato ligands, and two O atoms from two coordinating water molecules, forming a distorted octahedron. N1, N3, O1 and O4 atoms constitute the basal plane of the octahedron (the mean deviation from plane of 0.0522 Å). The O7 and O8 atoms occupy the two axial positions. The axial Zn-O7 and Zn-O8 distances are 2.074(5) and 2.082(5) Å, respectively. The basal Zn-O (2.006(4), 2.018(5) Å) and Zn-N (2.263(5), 2.270(5) Å) bond lengths are in normal range. The bond angles around the Zn(II) are in the range of 76.11(18)-178.5(2)°. All the molecules, ligands and solvate molecules participate in intermolecular N-H···O and O-H···O hydrogen bonds, which further stabilize the 3D framework.

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Section: Discussionmentioning

confidence: 99%

Crystal structure of diaqua-bis(3-oxo-3,4-dihydroquinoxaline-2-carboxylato-κ2N,O)-zinc(II)-methanol-water (1:1:1), [Zn(C9H5N2O3)2(H2O)2]·CH3OH·H2O, C19H20N4O10Zn

Xiao

2013

Zeitschrift Für Kristallographie - New Crystal Structures

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“…IR spectra were recorded on a Bruker spectrophotometer using KBr discs. 1 H and 13 C NMR spectra were recorded on a Bruker spectrometer operating at 500 MHz, using CDCl 3 as solvent. 1 H chemical shifts were referenced to the solvent peak position, δ 7.26 ppm.…”

Section: Characterization Methodsmentioning

confidence: 99%

“…1 H and 13 C NMR spectra were recorded on a Bruker spectrometer operating at 500 MHz, using CDCl 3 as solvent. 1 H chemical shifts were referenced to the solvent peak position, δ 7.26 ppm. e phase assignments for the BTU ligand and its copper(I) complexes were evaluated by polarizing optical light microscopy (POM), placed on untreated glass slides, using a Nikon 50iPol microscope equipped with a Linkam THMS600 hot stage and TMS94 control processor.…”

Section: Characterization Methodsmentioning

confidence: 99%

“…Liquid crystalline compounds (LC) based on metal complexes (metallomesogens) represent a special class of liquid crystals with interesting properties related to metal ions employed, such as luminescence, magnetism, redox properties, and so on [1,2]. e unique properties of thermotropic liquid crystals, in particular their electrooptical properties [3][4][5][6][7], have led to various applications (LCD, molecular sensors and detectors, optical switches, spatial light modulator, etc.)…”

Section: Introductionmentioning

confidence: 99%

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Discotic Liquid Crystals Based on Cu(I) Complexes with Benzoylthiourea Derivatives Containing a Perfluoroalkyl Chain

Iliş

Cı̂rcu

2018

Journal of Chemistry

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Mesomorphic three-coordinate copper(I) complexes ([Cu(BTU) 2 X], where X � Cl or Br) based on a new N-benzoylthiourea (BTU) ligand with two decyloxy and one perfluorooctyl groups at its periphery were designed and prepared. e BTU ligand coordinates via the S atom in a neutral monodentate fashion as confirmed by IR and NMR spectroscopy data. e liquid crystalline behavior of these copper(I) complexes was investigated by a combination of polarized optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction analysis (XRD), while their thermal stability was studied by thermogravimetric analysis (TGA). ese new copper(I) complexes have mesomorphic properties and exhibit a hexagonal columnar mesophase over a large temperature range, more than 100°C.

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“…The structure consists of ionic units: [AgL] 2 2þ and [PF6 ] À .The crystalline structure of 2 also contains four molecules of solvent: two of 1,2-dichloroethane and two of diethyl ether with a high disorder (see Experimental section). The structure consists of a bimetallic Ag(I) complex where metallic centres are connected via k 2 -N,P to two ligands in a head-to-face arrangement generating an homobimetallic macrocycle of 12 members.…”

mentioning

confidence: 99%

Exploring the reactivity of an N-pyrazole, P-phosphine hybrid ligand with Cu(I), Ag(I) and Au(I) precursors

Muñoz

Pons

Ros

et al. 2011

Journal of Organometallic Chemistry

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Metallomesogens by ligand design

Cited by 130 publications

References 90 publications

Crystal structure of diaqua-bis(3-oxo-3,4-dihydroquinoxaline-2-carboxylato-κ2N,O)-zinc(II)-methanol-water (1:1:1), [Zn(C9H5N2O3)2(H2O)2]·CH3OH·H2O, C19H20N4O10Zn

Crystal structure of diaqua-bis(3-oxo-3,4-dihydroquinoxaline-2-carboxylato-κ2N,O)-zinc(II)-methanol-water (1:1:1), [Zn(C9H5N2O3)2(H2O)2]·CH3OH·H2O, C19H20N4O10Zn

Discotic Liquid Crystals Based on Cu(I) Complexes with Benzoylthiourea Derivatives Containing a Perfluoroalkyl Chain

Exploring the reactivity of an N-pyrazole, P-phosphine hybrid ligand with Cu(I), Ag(I) and Au(I) precursors

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