scholarly journals Thermally Controlled Synthesis of Octahedral Rhenium Clusters with 4,4′-Bipyridine and CN− Apical Ligands

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2187
Author(s):  
Anton A. Ulantikov ◽  
Taisiya S. Sukhikh ◽  
Evgeniy N. Gribov ◽  
Natalia V. Maltseva ◽  
Konstantin A. Brylev ◽  
...  
Keyword(s):  
Functional Group ◽  
Weak Interactions ◽  
Molecular Compound ◽  
Cluster Complexes ◽  
Redox Active Ligand ◽  
Redox Active ◽  
Rhenium Cluster ◽  
Electron Reduction ◽  
Red Luminescence ◽  
New Compounds

The selective preparation, structural and spectroscopic study of two new rhenium cluster complexes trans-[Re6S8(bpy)4(CN)2] and trans-[Re6S8(bpy)2(CN)4]2− (bpy = 4,4′-bipyridine) obtained by reactions of corresponding hexarhenium cyanohalides with molten bpy are reported. The complexes were crystallized as solvates, displaying supramolecular structures based on cluster units linked by numerous weak interactions with bpy molecules. The molecular compound trans-[Re6S8(bpy)4(CN)2] (1) is insoluble in water and common organic solvents, while the ionic compound trans-Cs1.7K0.3[Re6S8(bpy)2(CN)4] (2) is somewhat soluble in DMSO, DMF and N-methylpyrrolidone. The presence of the redox-active ligand bpy leads to the occurrence of multi-electron reduction transitions in a solution of 2 at moderate potential values. The ambidentate CN− ligand is the secondary functional group, which has potential for the synthesis of coordination polymers based on the new cluster complexes. In addition, both new compounds show a weak red luminescence, which is characteristic of complexes with a {Re6S8}2+ cluster core.

scholarly journals 5-((8-Hydroxyquinolin-5-yl)diazenyl)-3-methyl-1H-pyrazole-4-carboxylic Acid

Molbank ◽  
10.3390/m1238 ◽  
2021 ◽  
Vol 2021 (2) ◽  
pp. M1238
Author(s):  
Ion Burcă ◽  
Valentin Badea ◽  
Calin Deleanu ◽  
Vasile-Nicolae Bercean
Keyword(s):  
Chemical Structure ◽  
Functional Group ◽  
Coupling Reaction ◽  
2D Nmr ◽  
Azo Coupling ◽  
2D Nmr Spectroscopy ◽  
Azo Compound ◽  
Ft Ir ◽  
New Compounds ◽  
Carboxylic Functional Group

A new azo compound was prepared via the azo coupling reaction between 4-(ethoxycarbonyl)-3-methyl-1H-pyrazole-5-diazonium chloride and 8-hydroxyquinoline (oxine). The ester functional group of the obtained compound was hydrolyzed and thus a new chemical structure with a carboxylic functional group resulted. The structures of the new compounds were fully characterized by: UV–Vis, FT-IR, 1D and 2D NMR spectroscopy, and HRMS spectrometry.

Reactivity of Aluminum Complexes of Redox-Active Ligand toward N-Heterocyclic Carbene and Its Thione

2019 ◽  
Vol 39 (1) ◽  
pp. 66-73 ◽  
Author(s):  
Vladimir G. Sokolov ◽  
Tatyana S. Koptseva ◽  
Roman V. Rumyantcev ◽  
Xiao-Juan Yang ◽  
Yanxia Zhao ◽  
...  
Keyword(s):  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active ◽  
Aluminum Complexes

POSSIBILITY OF MOLECULAR-SWITCH WITH CONTROLLED HYDROGEN BOND: UTILITY OF COMBINATION OF 2,2′-BIIMIDAZOLE AND REDOX-ACTIVE LIGAND

2005 ◽  
Vol 04 (01) ◽  
pp. 333-344 ◽  
Author(s):  
HIROTOSHI MORI ◽  
EISAKU MIYOSHI
Keyword(s):  
Density Functional ◽  
Molecular Level ◽  
Molecular Switch ◽  
Vibration Band ◽  
Functional Theory ◽  
Inorganic Molecule ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active ◽  
Stretching Vibration

A new inorganic molecule [ Co(Hbim) ( C 6 H 4 O 2)( NH 3)2]2 that can be used as a new optically durable molecular switch was theoretically designed in the framework of density functional theory. Three stable minima, belonging to 1 A g , 5 A 1, and 9 A g states, were found in the complex. Theoretically predicted infrared spectra of the complexes showed that a strong peak of NH stretching vibration is observed at 2690, 2120, and 2770 cm -1 in the 1 A g , 5 A 1, and 9 A g states, respectively. The apparent red shift of the NH stretching vibration band in the 5 A 1 state make it possible to distinguish the electronic state from others (1 A g and 9 A g ). This means that the complex can be used as a molecular level switch whose memory can be stably read by IR light without any photoreaction process; namely, without memory degradation.

Isolation of a uranium(iii) benzophenone ketyl radical that displays redox-active ligand behaviour

2014 ◽  
Vol 43 (48) ◽  
pp. 17885-17888 ◽  
Author(s):  
Ellen M. Matson ◽  
John J. Kiernicki ◽  
Nickolas H. Anderson ◽  
Phillip E. Fanwick ◽  
Suzanne C. Bart
Keyword(s):  
Ketyl Radical ◽  
Radical Complex ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active ◽  
Reducing Equivalents

The first uranium(iii) charge separated ketyl radical complex, Tp*2U(OC·Ph2), has been isolated and acts as a potent two-electron reductant with reducing equivalents derived from both uranium and the redox-active benzophenone.

scholarly journals Supramolecular Frameworks Based on Rhenium Clusters Using the Synthons Approach

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2662
Author(s):  
Nathalie Audebrand ◽  
Antoine Demont ◽  
Racha El Osta ◽  
Yuri V. Mironov ◽  
Nikolay G. Naumov ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Crystal Structures ◽  
Ligand Exchange ◽  
Alkaline Earth ◽  
Room Temperature ◽  
Hydration Rate ◽  
Rhenium Cluster ◽  
New Compounds ◽  
Cluster Unit

The reaction of the K4[{Re6Si8}(OH)a6]·8H2O rhenium cluster salt with pyrazine (Pz) in aqueous solutions of alkaline or alkaline earth salts at 4 °C or at room temperature leads to apical ligand exchange and to the formation of five new compounds: [trans-{Re6Si8}(Pz)a2(OH)a2(H2O)a2] (1), [cis-{Re6Si8}(Pz)a2(OH)a2(H2O)a2] (2), (NO3)[cis-{Re6Si8}(Pz)a2(OH)a(H2O)a3](Pz)·3H2O (3), [Mg(H2O)6]0.5[cis-{Re6Si8}(Pz)a2(OH)a3(H2O)a]·8.5H2O (4), and K[cis-{Re6Si8}(Pz)a2(OH)a3(H2O)a]·8H2O (5). Their crystal structures are built up from trans- or cis-[{Re6Si8}(Pz)a2(OH)a4−x(H2O)ax]x−2 cluster units. The cohesions of the 3D supramolecular frameworks are based on stacking and H bonding, as well as on H3O2−bridges in the cases of (1), (2), (4), and (5) compounds, while (3) is built from stacking and H bonding only. This evidences that the nature of the synthons governing the cluster unit assembly is dependent on the hydration rate of the unit.

Metal–Organic Frameworks Derived from Calcium and Strontium Complexes of a Redox-Active Ligand

2021 ◽  
Vol 60 (5) ◽  
pp. 3238-3248
Author(s):  
Natalia L. Bazyakina ◽  
Valentin M. Makarov ◽  
Sergey Yu. Ketkov ◽  
Artem S. Bogomyakov ◽  
Roman V. Rumyantcev ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active ◽  
Metal Organic

Catalytic nitrene transfer by a zirconium(iv) redox-active ligand complex

2011 ◽  
Vol 2 (1) ◽  
pp. 166-169 ◽  
Author(s):  
Andy I. Nguyen ◽  
Ryan A. Zarkesh ◽  
David C. Lacy ◽  
Megan K. Thorson ◽  
Alan F. Heyduk
Keyword(s):  
Ligand Complex ◽  
Nitrene Transfer ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active
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