ChemInform Abstract: Unprecedented Bidentate Coordination of the Uranyl Cation by the Chromate Anion in the Structure of [(CH3)2CHNH3]2[UO2(CrO4)2].

ChemInform ◽  
2012 ◽  
Vol 43 (14) ◽  
pp. no-no
Author(s):  
Oleg I. Siidra ◽  
Evgeny V. Nazarchuk ◽  
Sergey V. Krivovichev
Keyword(s):  
Bidentate Coordination ◽  
Uranyl Cation ◽  
Chromate Anion

Synthesis, characterization and biological activities of 1,3,4-oxadiazole derivatives of nalidixic acid and their copper complexes

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Nalidixic Acid ◽  
Copper Complexes ◽  
Biological Activities ◽  
Bidentate Coordination ◽  
Antibacterial And Antifungal Activities ◽  
Elemental Analyses ◽  
Oxadiazole Derivatives ◽  
Antibacterial And Antifungal ◽  
Derivatives Of ◽  
Substituted 1

A series of novel 1, 3, 4-oxadiazole analogues was synthesized from cyclization of hydrazones of substituted 1-ethyl-1,4-dihydro-7-methyl-4-oxo-1,8-naphthyridine-3-carbohydrazides were prepared from nalidixic acid. The structures of synthesized oxadiazole derivatives and their copper complexes were elucidated on the basis of FTIR, elemental analyses, 1H-NMR and atomic absorption spectral analysis. It was observed from spectral data that metal ligand ratio was 1:1 in all copper complexes and they were bidentate, coordination was found to be done through oxygen of 4-oxo group and nitrogen of oxadiazole ring. The synthesized compounds were further evaluated with biological activities and compared with parent hydrazones. Copper complexes possess antibacterial and antifungal activities better than the oxadiazoles while they have better antioxidant activity then copper complexes. Parent hydrazones were better in all biological activities than synthesized oxadiazoles.

scholarly journals A bipyridine-ligated zinc(II) complex with bridging flavonolate ligation: synthesis, characterization, and visible-light-induced CO release reactivity

2017 ◽  
Vol 73 (9) ◽  
pp. 703-709 ◽  
Author(s):  
Shayne Sorenson ◽  
Marina Popova ◽  
Atta M. Arif ◽  
Lisa M. Berreau
Keyword(s):  
Visible Light ◽  
Ligand Exchange ◽  
Distorted Octahedral Geometry ◽  
Conductivity Measurements ◽  
Bidentate Coordination ◽  
H Nmr ◽  
Distorted Octahedral ◽  
Spectroscopic Identification ◽  
Synthetic Models ◽  
Weak Coordination

Metal–flavonolate compounds are of significant current interest as synthetic models for quercetinase enzymes and as bioactive compounds of importance to human health. Zinc–3-hydroxyflavonolate compounds, including those of quercetin, kampferol, and morin, generally exhibit bidentate coordination to a single ZnII center. The bipyridine-ligated zinc–flavonolate compound reported herein, namely bis(μ-4-oxo-2-phenyl-4H-chromen-3-olato)-κ3 O 3:O 3,O 4;κ3 O 3,O 4:O 3-bis[(2,2′-bipyridine-κ2 N,N′)zinc(II)] bis(perchlorate), {[Zn2(C15H9O3)2(C10H8N2)2](ClO4)2} n , (1), provides an unusual example of bridging 3-hydroxyflavonolate ligation in a dinuclear metal complex. The symmetry-related ZnII centers of (1) exhibit a distorted octahedral geometry, with weak coordination of a perchlorate anion trans to the bridging deprotonated O atom of the flavonolate ligand. Variable-concentration conductivity measurements provide evidence that, when (1) is dissolved in CH3CN, the complex dissociates into monomers. 1H NMR resonances for (1) dissolved in d 6-DMSO were assigned via HMQC to the H atoms of the flavonolate and bipyridine ligands. In CH3CN, (1) undergoes quantitative visible-light-induced CO release with a quantum yield [0.004 (1)] similar to that exhibited by other mononuclear zinc–3-hydroxyflavonolate complexes. Mass spectroscopic identification of the [(bpy)2Zn(O-benzoylsalicylate)]+ ion provides evidence of CO release from the flavonol and of ligand exchange at the ZnII center.

An ultramicro-scale method for the determination of the uranyl cation

The Analyst ◽  
1973 ◽  
Vol 98 (1168) ◽  
pp. 525 ◽  
Author(s):  
Glenn Peter Wood
Keyword(s):  
Scale Method ◽  
Uranyl Cation

A series of homonuclear lanthanide coordination polymers based on a fluorescent conjugated ligand: syntheses, luminescence and sensor for pollutant chromate anion

CrystEngComm ◽  
2015 ◽  
Vol 17 (41) ◽  
pp. 7878-7887 ◽  
Author(s):  
Xun Feng ◽  
Rongfang Li ◽  
Liya Wang ◽  
Seik Weng Ng ◽  
Guozhan Qin ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Lanthanide Coordination Polymers ◽  
Chromate Anion

Series of homonuclear lanthanide coordination polymers incorporating conjugated ligand have been fabricated successfully and characterized systematically.

Synthesis, structure characterization, photoluminescence properties and TD–DFT calculations for two new borates

2018 ◽  
Vol 74 (4) ◽  
pp. 411-417 ◽  
Author(s):  
Nasreddine Hadjadj ◽  
Mohamed AbdEsselem Dems ◽  
Hocine Merazig ◽  
Lamia Bendjeddou
Keyword(s):  
Density Functional ◽  
Light Emission ◽  
Blue Emission ◽  
Structure Characterization ◽  
Photoluminescence Properties ◽  
Ambient Conditions ◽  
Functional Theory ◽  
Bidentate Coordination ◽  
Tetrahedral Environment ◽  
Td Dft

Due to their rich structural chemistry and wide variety of applications, borate materials have provided a rich area of research. In a continuation of this research, diethylammonium bis(2-oxidobenzoato-κ2 O 1,O 2)borate, C4H12N+·BO4(C7H4O)2 −, (1), and propylammonium bis(2-oxidobenzoato-κ2 O 1,O 2)borate, C3H10N+·BO4(C7H4O)2 −, (2), have been synthesized by the reaction of boric acid with salicylic acid under ambient conditions. In both structures, the B atom exhibits a slightly distorted tetrahedral environment formed by the bidentate coordination of two salicylate anions via the O atoms of the central carboxylate and oxide groups. In the crystals of salts (1) and (2), mixed cation–anion layers lying parallel to the (101) plane are formed through N—H...O, C—H...O and C—H...π/N—H...O hydrogen-bonding interactions, resulting, in each case, in a two-dimensional supramolecular architecture in the solid state. The photoluminescence properties of the salts were studied using the as-synthesized samples and reveal that salts (1) and (2) both display a strong blue-light emission, with maxima at 489 and 491 nm, respectively. In DFT/TD–DFT (time-dependent density functional theory) studies, the blue emission appears to be derived from an intramolecular charge transfer (ICT) excited state. In addition, IR and UV–Vis spectroscopies were used to investigate the title salts.

Uranyl Cation Incorporation in the [P8W48O184]40– Macrocycle Phosphopolytungstate

2018 ◽  
Vol 58 (2) ◽  
pp. 1091-1099 ◽  
Author(s):  
Maxime Dufaye ◽  
Sylvain Duval ◽  
Grégory Stoclet ◽  
Xavier Trivelli ◽  
Marielle Huvé ◽  
...  
Keyword(s):  
Uranyl Cation

Hexadentate β-Dicarbonyl(bis-catecholamine) Ligands for Efficient Uranyl Cation Decorporation: Thermodynamic and Antioxidant Activity Studies

2019 ◽  
Vol 58 (21) ◽  
pp. 14626-14634
Author(s):  
Qingchun Zhang ◽  
Bo Jin ◽  
Tian Zheng ◽  
Xingyan Tang ◽  
Zhicheng Guo ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Uranyl Cation
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