Influence of metal ions on the formation of new metal complexes constructed from tetrachlorophthalic acid

2015 ◽  
Vol 70 (10) ◽  
pp. 711-718
Author(s):  
An-Qi Dai ◽  
Qi Yan ◽  
Jing Zhong ◽  
Sheng-Chun Chen ◽  
Ming-Yang He ◽  
...  
Keyword(s):  
Metal Ions ◽  
Significant Contribution ◽  
Transition Metal Ions ◽  
Planar Geometry ◽  
X Ray ◽  
X Ray Crystallography ◽  
Transitional Metal ◽  
Square Planar ◽  
Structural Differences ◽  
Metal Effect

AbstractReaction of 3,4,5,6-tetrachloro-1,2-benzenedicarboxylyic acid (1,2-H2BDC-Cl4) with transitional metal salts at room temperature in mixed DMF/H2O solvent affords three complexes formulated as [Cu(1,2-HBDC-Cl4)2(DMF)2] (1), {[Cd(1,2-HBDC-Cl4)2(H2O)4]·2DMF} (2), and {[Ni(1,2-BDC-Cl4)(H2O)5]·DMF·H2O} (3) (DMF = N,N-dimethylformamide). All these complexes have been characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, and single-crystal X-ray crystallography. In 1, the CuII ion is four-coordinated with a square-planar geometry formed by two 1,2-HBDC-Cl4 anions and two DMF ligands; in 2, the CdII ion takes an octahedral geometry coordinated by two 1,2-HBDC-Cl4 anions and four aqua ligands; while in 3, the NiII ion is octahedrally coordinated by one 1,2-BDC-Cl4 dianion and five aqua ligands. Intermolecular O–H···O hydrogen bonds and Cl···Cl (or C–H···Cl) interactions provide a significant contribution to stabilizing the three mononuclear structures in the solid state. The results suggest that structural differences among them are attributed to the influence of transition metal ions. The fluorescence of the complexes and of 1,2-H2BDC-Cl4 has been investigated. No significant metal effect has been observed.

scholarly journals Reaction with Proteins of a Five-Coordinate Platinum(II) Compound

2019 ◽  
Vol 20 (3) ◽  
pp. 520 ◽  
Author(s):  
Giarita Ferraro ◽  
Tiziano Marzo ◽  
Maria Cucciolito ◽  
Francesco Ruffo ◽  
Luigi Messori ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Platinum Complexes ◽  
Rnase A ◽  
Side Chain ◽  
Planar Geometry ◽  
Ionization Mass ◽  
X Ray ◽  
X Ray Crystallography ◽  
Egg White Lysozyme ◽  
Square Planar

Stable five-coordinate Pt(II) complexes have been highlighted as a promising and original platform for the development of new cytotoxic drugs. Their interaction with proteins has been scarcely studied. Here, the reactivity of the five-coordinate Pt(II) compound [Pt(I)(Me) (dmphen)(olefin)] (Me = methyl, dmphen = 2,9-dimethyl-1,10-phenanthroline, olefin = dimethylfumarate) with the model proteins hen egg white lysozyme (HEWL) and bovine pancreatic ribonuclease (RNase A) has been investigated by X-ray crystallography and electrospray ionization mass spectrometry. The X-ray structures of the adducts of RNase A and HEWL with [Pt(I)(Me)(dmphen)(olefin)] are not of very high quality, but overall data indicate that, upon reaction with RNase A, the compound coordinates the side chain of His105 upon releasing the iodide ligand, but retains the pentacoordination. On the contrary, upon reaction with HEWL, the trigonal bi-pyramidal Pt geometry is lost, the iodide and the olefin ligands are released, and the metal center coordinates the side chain of His15 probably adopting a nearly square-planar geometry. This work underlines the importance of the combined use of crystallographic and mass spectrometry techniques to characterize, in detail, the protein–metallodrug recognition process. Our findings also suggest that five-coordinate Pt(II) complexes can act either retaining their uncommon structure or functioning as prodrugs, i.e., releasing square-planar platinum complexes as bioactive species.

scholarly journals Pd(II) and Zn(II) Complexes with 9-Anthraldehyde 3-tetramethyleneiminylthiosemicarbazone

2020 ◽  
Vol 36 (3) ◽  
Author(s):  
Dinh Thi Hien ◽  
Khuat Thi Thuy Ha ◽  
Nguyen Minh Hai
Keyword(s):  
Metal Ions ◽  
Central Metal ◽  
X Ray ◽  
X Ray Crystallography ◽  
Square Planar ◽  
Mononuclear Structure

Two Pd(II) and Zn(II) complexes with an anthracene-based thiosemicarbazone (H-5cATSC) have been conveniently prepared. Reaction of the ligand with relevant metal precusors yields the complexes Pd-5cATSC and Zn-5cATSC which have been then structurally determined by X-ray crystallography. The results reveals that the complexes are of mononuclear structure and adopts square-planar and tetrahedral geometries around the central metal ions.

Crystal-Structure of Bis(2,2'-6',2'-terpyridine)manganese(II) Bis(triiodide) [Mn(terpy)2](I3)2

1991 ◽  
Vol 44 (2) ◽  
pp. 303 ◽  
Author(s):  
R Bhula ◽  
DC Weatherburn
Keyword(s):  
Crystal Structure ◽  
Transition Metal ◽  
Metal Ions ◽  
Coordination Sphere ◽  
Metal Ion ◽  
Transition Metal Ions ◽  
Triclinic Space Group ◽  
X Ray ◽  
X Ray Crystallography ◽  
Distorted Octahedral

The crystal structure of [ Mn ( terpy )2](I3)2( terpy = 2,2°:6°,2°-terpyridene) has been determined by X-ray crystallography. The crystals are triclinic, space group Pī , a 9.357(4), b 8.600(2), c 24.531(8) Ǻ, α 93.64(2), B 95.58(3), γ 91.52(2)°, Z 2, V 1960(1)Ǻ3. The structure has been refined to a residual R of 0.065 (Rw 0.070). The coordination sphere of the metal ion is distorted octahedral with each terpy ligand coordinated in a meridional fashion. The structure is compared with those of other M( terpy )2n+ complexes formed by first-row transition metal ions.

Hemilabile imino-phosphine palladium(II) complexes: synthesis, molecular structure, and evaluation in Heck reactions

2014 ◽  
Vol 68 (7) ◽  
Author(s):  
William Motswainyana ◽  
Martin Onani ◽  
Roger Lalancette ◽  
Paul Tarus
Keyword(s):  
Molecular Structure ◽  
Planar Geometry ◽  
Coordination Geometry ◽  
Coupling Reactions ◽  
Heck Coupling ◽  
Heck Reactions ◽  
Reaction Conditions ◽  
X Ray ◽  
X Ray Crystallography ◽  
Square Planar

AbstractThe ligands 2-(diphenylphosphino)benzyl-(2-thiophene)methylimine (V) and 2-(diphenylphosphino) benzyl-(2-thiophene)ethylimine (VI) were prepared from 2-(diphenylphosphino)benzaldehyde and thiophene amines with very good yields. An equimolar reaction of V and VI with either PdCl2(cod) (cod = cyclooctadiene) or PdClMe(cod) afforded palladium(II) complexes I–IV. The molecular structure of II was confirmed by X-ray crystallography. The coordination geometry around the palladium atom exhibited distorted square planar geometry at the palladium centre. Complexes I, II, and IV were evaluated as catalysts for Heck coupling reactions of iodobenzene with methyl acrylate under mild reaction conditions; 0.1 mole % catalyst, Et3N base, MeCN reflux for 8 h, 80°C; isolated yield on a 10 mmol scale with catalyst I (64 %), II (68 %), and IV (58 %). They all exhibited significant activities.

Synthesis, structure and metal ion coordination of novel benzodiazamacrocyclic ligands bearing pyridyl and picolinate pendant side-arms

2019 ◽  
Vol 43 (38) ◽  
pp. 15072-15086
Author(s):  
Pavel A. Panchenko ◽  
Anastasia D. Zubenko ◽  
Ekaterina Y. Chernikova ◽  
Yuri V. Fedorov ◽  
Anna V. Pashanova ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Complex Formation ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Transition Metal Ions ◽  
X Ray ◽  
X Ray Crystallography

Complex formation of benzodiazacrown ethers with heavy and transition metal ions was studied using NMR spectroscopy, potentiometry and X-ray crystallography.

Synthesis of the complexes [PdCIR(cod)] (R = benzyl, ethyl; cod = 1,5-cyclooctadiene). β-Elimination from [PdCIEt(cod)] to give the η1,η2 and η3 isomers of [Pd2(μ-Cl)2(C8H13)2]

1996 ◽  
Vol 74 (11) ◽  
pp. 1990-1997 ◽  
Author(s):  
Robert A. Stockland Jr. ◽  
Gordon K. Anderson ◽  
Nigam P. Rath ◽  
Janet Braddock-Wilking ◽  
J. Christopher Ellegood
Keyword(s):  
Aqueous Solution ◽  
Metal Complex ◽  
Equilibrium Mixture ◽  
Reductive Elimination ◽  
Planar Geometry ◽  
X Ray ◽  
X Ray Crystallography ◽  
Square Planar ◽  
Migratory Insertion ◽  
Palladium Metal

Treatment of [PdCl2(cod)] with tetrabenzyltin gives the benzylpalladium complex [PdCl(CH2Ph)(cod)] (cod = 1,5-cyclooctadiene), 1a, whose structure has been determined by X-ray crystallography. It adopts approximate square-planar geometry, with the double bonds perpendicular to the square plane. The corresponding ethylpalladium derivative 1b has been prepared by a similar method, but it is considerably less stable. It decomposes by (β-elimination to produce ethene and a transient hydride complex, which either undergoes migratory insertion to give [Pd2(μ-Cl)2(η1,η2-C8H13)2], 2a, or dinuclear reductive elimination with a second molecule of 1b to produce ethane, [PdCl2(cod)], free cyclooctadiene, and palladium metal. Complex 2a has also been prepared by reaction of [PdCl2(cod)] with NaBH4. At higher temperatures 2a converts to an equilibrium mixture with its η3-allyl isomer, 2b. Reactions of [PdCl2(cod)] or K2PdCl4 in the presence of cyclooctadiene in aqueous solution to produce 2a or 2b have also been investigated. Key words: palladium, diene complexes, allyl complexes, isomerization, β-elimination.

scholarly journals Unsymmetrical Schiff Base Functionalized as Monobasic Tridentate Ligand on Complexation with Some Transition Metal Ions

2012 ◽  
Vol 9 (2) ◽  
pp. 532-544
Author(s):  
Bibhesh K. Singh ◽  
Narendar Bhojak ◽  
Anant Prakash
Keyword(s):  
Schiff Base ◽  
Transition Metal Ions ◽  
Tridentate Ligand ◽  
Planar Geometry ◽  
Physico Chemical ◽  
Square Planar ◽  
Unsymmetrical Schiff Base ◽  
Mm2 Calculations ◽  
Microbial Potential

Cu(II), Co(II), Ni(II) and Mn(II) complexes of Schiff base derived from 2-aminophenol and pyrrole-2- carbaldehyde have been prepared. The complexes are formed by coordination of N and O atoms of the ligand. Their structures were characterized by physico-chemical and spectroscopic methods. Molecular structure of the complexes has been optimized by MM2 calculations and suggests a tetrahedral/ square planar geometry. The bio-efficacy of the ligand and their complexes has been examined against the growth of bacteriain vitroto evaluate their anti-microbial potential.

Crystal Structure, Spectroscopic and Redox Properties of Copper(II) Bis{2-[(2,6-dimethylphenyl)iminomethyl-3-methoxyphenolate]}

2007 ◽  
Vol 62 (9) ◽  
pp. 1133-1138 ◽  
Author(s):  
Veli T. Kasumov ◽  
Ibrahim Uçar ◽  
Ahmet Bulut ◽  
Fevzi Kösal
Keyword(s):  
Crystal Structure ◽  
Title Complex ◽  
Redox Properties ◽  
Orthorhombic Space Group ◽  
Long Distance ◽  
X Ray ◽  
X Ray Crystallography ◽  
Square Planar ◽  
Planar Molecules ◽  
Exchange Interaction Parameter

The coordination chemistry of N-(2,6-di-methylphenyl)-2-hydroxy-3-methoxybenzaldimine (1) with Cu(II) has been investigated by X-ray crystallography, electronic and EPR spectroscopies, as well as by electro- and magnetochemistry. The title complex 2 crystallizes in the orthorhombic space group P212121 (a = 8.1538, b = 17.7466, c =19.8507 Å). The mononuclear square-planar molecules 2 featuring trans-N2O2 coordination are connected via weak intermolecular C-H· · ·π interactions into infinite chains parallel to the a axis. Although the intermolecular Cu· · ·Cu separations within individual chains and between chains are very long (8.154 and 9.726 Å ), the exchange interaction parameter G = 2.03 < 4, estimated from solid state EPR spectra, suggests the existence of long-distance superexchange pathways between adjacent Cu(II) centers. The electronic and electrochemical features of the compound are also discussed.

scholarly journals Structural and functional properties of a magnesium transporter of the SLC11/NRAMP family

eLife ◽  
2022 ◽  
Vol 11 ◽  
Author(s):  
Karthik Ramanadane ◽  
Monique S Straub ◽  
Raimund Dutzler ◽  
Cristina Manatschal
Keyword(s):  
Hydration Shell ◽  
Transition Metal Ions ◽  
Ion Binding ◽  
X Ray ◽  
X Ray Crystallography ◽  
Protein Architecture ◽  
Large Pool ◽  
Structural And Functional Properties ◽  
The Family ◽  
Magnesium Transporter

Members of the ubiquitous SLC11/NRAMP family catalyze the uptake of divalent transition metal ions into cells. They have evolved to efficiently select these trace elements from a large pool of Ca2+ and Mg2+, which are both orders of magnitude more abundant, and to concentrate them in the cytoplasm aided by the cotransport of H+ serving as energy source. In the present study, we have characterized a member of a distant clade of the family found in prokaryotes, termed NRMTs, that were proposed to function as transporters of Mg2+. The protein transports Mg2+ and Mn2+ but not Ca2+ by a mechanism that is not coupled to H+. Structures determined by cryo-EM and X-ray crystallography revealed a generally similar protein architecture compared to classical NRAMPs, with a restructured ion binding site whose increased volume provides suitable interactions with ions that likely have retained much of their hydration shell.

Characterization on the Microstructures and Optical Performances of TiO2 Doped with Transition Metals

2014 ◽  
Vol 887-888 ◽  
pp. 388-394 ◽  
Author(s):  
Xin Hua Liu ◽  
Yi Deng ◽  
Yu Chuan Zhang ◽  
Yin Hang Zhou
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Photoelectron Spectroscopy ◽  
Transition Metal Ions ◽  
Ultraviolet Region ◽  
Visible Light Region ◽  
X Ray Diffraction ◽  
X Ray ◽  
Light Region ◽  
Cu Ions

The structures and optical performances of TiO2doped with 4thperiodic transition metal ions were investigated in this paper. The characterization results of X-ray photoelectron spectroscopy and X-ray diffraction showed that the transition metal ions existed in oxidative states, and composites formed because of the reaction between doped metal ions and TiO2. The absorption spectroscopy of TiO2doped with zinc was mainly in ultraviolet region, close to that of the pure TiO2. While for TiO2doped with other transition metal ions including V, Cr, Mn, Fe, Co, Ni and Cu ions, the absorption spectroscopies covered ultraviolet region and visible light region, much broader than that of the pure TiO2.

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