scholarly journals STRUCTURE AND SPECTRAL-LUMUINESCENT PROPERTIES OF LANTHANIDE-CONTAINING COMPLEXES WITH AZACROWN CALIXARENES

2021 ◽  
Vol 87 (10) ◽  
pp. 103-115
Author(s):  
Serhii Smola ◽  
Natalia Rusakova ◽  
Olena Alekseeva ◽  
Stepan Basok ◽  
Tatiana Kirichenko ◽  
...  
Keyword(s):  
Mass Spectroscopy ◽  
Lanthanide Complexes ◽  
Solvent Molecule ◽  
Azacrown Ether ◽  
Counter Anion

Lanthanide complexes with calix[4]arenes lower rim substituted with two azacrown ether fragments are reported. The size of the substituent cavity varied from 4 to 6 heteroatoms. The complexes were analyzed by means of IR, NMR, ESI mass spectroscopy. It is assumed that the coordination of Ln(III) ions occurs through the donor atoms of the lower rim; the counter anion and solvent molecule are also coordinated. Lanthanide-centered characteristic luminescence was observed in Eu(III), Tb(III) and Yb(III) complexes. The most efficient 4f-luminescence is observed for terbium-containing complexes with benzo-crown-derived ligands. The pathways of the sensitization of 4f-luminescence are discussed.

scholarly journals Dichlorido(5,10,15,20-tetraphenylporphyrinato-κ4 N)antimony(V) hemi{di-μ-chlorido-bis[trichloridoantimonate(III)]} dichloromethane monosolvate

2012 ◽  
Vol 68 (6) ◽  
pp. m717-m718 ◽  
Author(s):  
Raoudha Soury ◽  
Mohamed Sahah Belkhiria ◽  
Habib Nasri ◽  
Masood Parvez
Keyword(s):  
Complex Cation ◽  
Solvent Molecule ◽  
Chloride Ions ◽  
Title Complex ◽  
Inversion Center ◽  
Asymmetric Unit ◽  
Counter Anion ◽  
Wide Range ◽  
Solvent Molecules ◽  
Cl Atoms

The asymmetric unit of the title complex, [Sb(C44H28N4)Cl2][Sb2Cl8]0.5·CH2Cl2, is composed of a SbV complex cation wherein the Sb atom is hexacoordinated by four N atoms of the pyrrole rings of the tetraphenylporphyrinate (TPP) ligands and two chloride ions, a half di-μ-chlorido-bis[trichloridoantimonate(III)] counter-anion and a dichloromethane solvent molecule. In the cation, the average Sb—N distance is 2.066 (2) Å, while the Sb—Cl distances are 2.3410 (11) and 2.3639 (12) Å. The central unit of the cation, SbN4C20, is far from being planar, with deviations of atoms from the least-squares plane ranging from −0.110 (4) to 0.124 (4) Å. The Sb—Cl distances in the anion, which is located about an inversion center, lie in the wide range 2.3715 (13)–2.7489 (13) Å, the longest distances being between the Sb and bridging Cl atoms. The crystal structure is stabilized by intermolecular C—H...Cl interactions involving the cations, the anions and the solvent molecules. The solvent molecule is disordered over two orientations in a 0.901 (13):0.099 (13) ratio.

scholarly journals (μ-Acetato-κ2O:O′)[μ-2,6-bis({bis[(pyridin-2-yl-κN)methyl]amino-κN}methyl)-4-methylphenolato-κ2O:O](methanol-κO)dizinc bis(perchlorate)

2014 ◽  
Vol 70 (4) ◽  
pp. m120-m121
Author(s):  
Biswanath Das ◽  
Matti Haukka ◽  
Ebbe Nordlander
Keyword(s):  
Hydrogen Bond ◽  
Solvent Molecule ◽  
Title Complex ◽  
Acetate Group ◽  
Counter Anion ◽  
Present Structure ◽  
Octadentate Ligand

The binuclear title complex, [Zn2(C33H33N6O)(CH3COO2)(CH3OH)](ClO4)2, was synthesized by the reaction between 2,6-bis({[bis(pyridin-2-yl)methyl]amino}methyl)-4-methylphenol (H-BPMP), Zn(OAc)2and NaClO4. The two ZnIIions are bridged by the phenolate O atom of the octadentate ligand and the acetate group. An additional methanol ligand is terminally coordinated to one of the ZnIIions, rendering the whole structure unsymmetric. Other symmetric dizinc complexes of BPMP have been reported. However, to the best of our knowledge, the present structure, in which the two ZnIIions are distinguishable by the number of coordinating ligands and the coordination geometries (octahedral and square-pyramidal), is unique. The dizinc complex is a dication, and two perchlorate anions balance the charge. The –OH group of the coordinating methanol solvent molecule forms a hydrogen bond with a perchlorate counter-anion. One of the anions is disordered over two sets of sites with an occupancy ratio of 0.734 (2):0.266 (2).

Spin crossover Fe(ii) complexes of a cross-bridged cyclam derivative

2018 ◽  
Vol 47 (17) ◽  
pp. 6134-6145 ◽  
Author(s):  
Bohuslav Drahoš ◽  
Zdeněk Trávníček
Keyword(s):  
Spin Crossover ◽  
Solvent Molecule ◽  
Counter Anion

Fe(ii) complexes of a cross-bridged cyclam derivative (L) show spin-crossover depending on the counter anion and crystal solvent molecule(s).

A Crystallographic Study of Bis[S-benzyl-5-bromo-2-oxoindolin-3-ylidenemethanehydrazonthioate] Disulfide Solvated with Dimethylsulfoxide

2012 ◽  
Vol 9 (2) ◽  
pp. 87
Author(s):  
Mohd Abdul Fatah Abdul Manan ◽  
M. Ibrahim M. Tahir ◽  
Karen A. Crouse ◽  
Fiona N.-F. How ◽  
David J. Watkin
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Solvent Molecule ◽  
Site Occupancy ◽  
Unit Cell Parameters ◽  
Intermolecular Hydrogen Bonds ◽  
Triclinic Space Group ◽  
Cell Parameters ◽  
Crystallographic Study ◽  
Thiol Form

The crystal structure of the title compound has been determined. The compound crystallized in the triclinic space group P -1, Z = 2, V = 1839 .42( 18) A3 and unit cell parameters a= 11. 0460( 6) A, b = 13 .3180(7) A, c=13. 7321 (8) A, a = 80.659(3 )0, b = 69 .800(3 )0 and g = 77 .007 (2)0 with one disordered dimethylsulfoxide solvent molecule with the sulfur and oxygen atoms are distributed over two sites; S101/S102 [site occupancy factors: 0.6035/0.3965] and 0130/0131 [site occupancy factor 0.3965/0.6035]. The C22-S2 l and C 19-S20 bond distances of 1. 779(7) A and 1. 788(8) A indicate that both of the molecules are connected by the disulfide bond [S20-S21 2.055(2) A] in its thiol form. The crystal structure reveals that both of the 5-bromoisatin moieties are trans with respect to the [S21-S20 and CI 9-Nl 8] and [S20-S21 and C22-N23] bonds whereas the benzyl group from the dithiocarbazate are in the cis configuration with respect to [S21-S20 and C19-S44] and [S20-S21 and C22-S36] bonds. The crystal structure is further stabilized by intermolecular hydrogen bonds of N9-H35···O16 formed between the two molecules and N28-H281 ···O130, N28-H281 ···O131 and C4 l-H4 l l ···O 131 with the solvent molecule.

Photochemical and Electrochemical Reduction of Carbon Dioxide Catalyzed by a Polyoxometalate-Organic Photosensitizer Complex

2018 ◽  
Author(s):  
Chandan Dey ◽  
Ronny Neumann
Keyword(s):  
Carbon Dioxide ◽  
Cyclic Voltammetry ◽  
Formic Acid ◽  
Electrochemical Reduction ◽  
Mass Spectroscopy ◽  
Photochemical Reactions ◽  
Reducing Agent ◽  
Covalent Attachment ◽  
Hybrid Complex ◽  
Open Face

<p>A manganese substituted Anderson type polyoxometalate, [MnMo<sub>6</sub>O<sub>24</sub>]<sup>9-</sup>, tethered with an anthracene photosensitizer was prepared and used as catalyst for CO<sub>2</sub> reduction. The polyoxometalate-photosensitizer hybrid complex, obtained by covalent attachment of the sensitizer to only one face of the planar polyoxometalate, was characterized by NMR, IR and mass spectroscopy. Cyclic voltammetry measurements show a catalytic response for the reduction of carbon dioxide, thereby suggesting catalysis at the manganese site on the open face of the polyoxometalate. Controlled potentiometric electrolysis showed the reduction of CO<sub>2</sub> to CO with a TOF of ~15 sec<sup>-1</sup>. Further photochemical reactions showed that the polyoxometalate-anthracene hybrid complex was active for the reduction of CO<sub>2</sub> to yield formic acid and/or CO in varying amounts dependent on the reducing agent used. Control experiments showed that the attachment of the photosensitizer to [MnMo<sub>6</sub>O<sub>24</sub>]<sup>9-</sup> is necessary for photocatalysis.</p><div><br></div>

Simultaneous Generation of a [2×2] Grid-like Complex and a Linear Double Helicate: A Three-Level Self-Sorting Process

2019 ◽  
Author(s):  
Jean-François Ayme ◽  
Jean-Marie Lehn ◽  
Corinne Bailly ◽  
Lydia Karmazin
Keyword(s):  
Metal Complexes ◽  
Mass Spectroscopy ◽  
Metal Salts ◽  
Simultaneous Generation ◽  
X Ray ◽  
X Ray Crystallography ◽  
Sorting Process

<div>Two constitutional dynamic libraries (CDLs)—each containing two amines, two dialdehydes and two metal salts—have been found to self-sort, generating two pairs of imine-based metallosupramolecular architectures sharing no component, a [2×2] grid-like complex and a linear double helicate. These CDLs provided unique examples of a three-level self-sorting process, as only two imine-based ligand constituents, two metal complexes and two architectures were selected during their assembling out of all the possible combinations of their initial components. The metallosupramolecular architectures assembled were characterized by NMR, mass spectroscopy, and X-ray crystallography.</div>

MONOLAYERS LENGMYUR AZAKRAUN-ESSENTIAL DERIVATIVES OF CALIXES[4]ARENA

2018 ◽  
Vol 1 (11(56)) ◽  
pp. 62-64
Author(s):  
A.A. Muravev ◽  
E.A. Ivanova ◽  
A.T. Yakupov
Keyword(s):  
Aggregation Behavior ◽  
Langmuir Films ◽  
Azacrown Ether ◽  
Derivatives Of

In this work, aggregation behavior of azacrown-ether derivatives on a macrocyclic calix[4]arene scaffold within ultrathin Langmuir films on water subphase is considered.

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