Relevant bibliographies by topics / Tetranuclear nickel(II) complex

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Academic literature on the topic 'Tetranuclear nickel(II) complex'

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Published: 5 June 2025
Last updated: 15 July 2025

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Journal articles on the topic "Tetranuclear nickel(II) complex"

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Roy, Sourav, Arka Dey, Michael G. B. Drew, Partha Pratim Ray, and Shouvik Chattopadhyay. "A tetranuclear nickel/lead complex with a salen type Schiff base: synthesis, structure and exploration of photosensitive Schottky barrier diode behaviour." New Journal of Chemistry 43, no. 13 (2019): 5020–31. http://dx.doi.org/10.1039/c8nj05616a.

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A tetranuclear nickel(ii)/lead(ii) complex has been synthesized and characterized. The complex based device behaves as a Schottky diode. The charge transfer kinetics of the complex is enhanced after light soaking.
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Bhattacharyya, Anik, Mithun Das, Antonio Bauzá, et al. "Both end-on and end-to-end azide bridged tetranuclear ferromagnetic nickel(ii) Schiff base complexes." New Journal of Chemistry 41, no. 22 (2017): 13585–92. http://dx.doi.org/10.1039/c7nj00852j.

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Variable temperature magnetic measurement of a tetranuclear nickel(ii) complex, consisting of two pseudo-dinuclear entities, indicates the presence of intra- and inter-dinuclear ferromagnetic interactions, corroborated by DFT calculations.
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Traoré, Bocar, Thierno Moussa Seck, Mohamed Lamine Sall, et al. "Synthesis, Crystal Structure Determination and Magnetic Study of a New [2 × 2] Grid Tetranuclear Fe(II) and Ni(II) Complexes Derived from the Ligand 1, 5-Bis(1-(Pyridin-2-Yl) Ethylidene) Carbonohydrazide)." International Research Journal of Pure and Applied Chemistry 24, no. 4 (2023): 50–67. http://dx.doi.org/10.9734/irjpac/2023/v24i4819.

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Complexes of nickel (II) and iron (III) are easily synthetized using the symmetrical ligand 1,5-bis(1-(pyridin-2-yl)ethylidene)carbonohydrazide) (H2L) and metal nitrate salts. Square [2x2] grids structure of one tetranuclear iron and one tetranuclear nickel complex were isolated. X ray diffraction analysis reveals that the crystal structures of the two complexes are similar. The asymmetric unit of each complex consists of four cationic ligand molecules and four metal ions. Each ligand acts in its monodeprotonated form through five coordination sites such as two pyridine nitrogen atoms, two azomethine nitrogen atoms and one oxygen atom. Each of the four ligand molecules acts as a bridge between two metal ions yielding a square 2 x 2 grid structure. Each of the metal ion is hexacoordinated and is situated in a N4O2 core and the environment is best described as a severely distorted square bipyramidal geometry. Electrochemical studies show two electrons process for complex 1 and one electron process for complex 2. Variable temperature magnetic study shows that antiferromagnetic coupling is stronger in the nickel(II) than in the iron(II) complex. Perfect correlation between the magnetic properties and the crystallographic data are observed in both complexes.
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Zhang, Feng, Yun Chen, Jia-Nan Feng, Jian-Hua Sun, and Ching-Cheng Huang. "Structure and magnetism of a linear tetranuclear nickel complex ligated by compartmental ligand." Bulletin of the Chemical Society of Ethiopia 39, no. 4 (2025): 781–89. https://doi.org/10.4314/bcse.v39i4.13.

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A new nickel(II) complex [Ni4L3(acac)2(H2O)2]·2DMF·Et2O (1) (acac = acetylacetonate, and DMF = N,N′-dimethylformamide) was isolated in solid crystalline form with the reaction of nickel(II) acetylacetonate and compartmental Schiff base ligand 1,2-bis(2-hydroxy-3-methoxybenzylidene) hydrazine (H2L). Single crystal X-ray analysis showed that the complex has a linear tetranuclear structure. In the complex, an unusual μ3– and μ4–bridging modes of Ligand L2- were coexisting. Variable-temperature magnetic studies revealed that weak antiferromagnetic interaction exists between the nickel(II) ions coupling through phenoxide−O atoms and −N−N− bridging moieties. Bull. Chem. Soc. Ethiop. 2025, 39(4), 781-789. DOI: https://dx.doi.org/10.4314/bcse.v39i4.13
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Lozan, Vasile. "Stabilization of Unusual Substrate Coordination Modes in Dinuclear Macrocyclic Complexes." Chemistry Journal of Moldova 5, no. 1 (2010): 24–35. http://dx.doi.org/10.19261/cjm.2010.05(1).02.

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The steric protection offered by the macrobinucleating hexaazaditiophenolateligand (L) allows for the preparation of the first stable dinuclear nickel(II) borohydride bridged complex, which reacts rapidly with elemental sulphur producing a tetranuclear nickel(II) complex [{(L)Ni2}2(μ-S6)]2+ bearing a helical μ4-hexa- sulfide ligand. The [(L)CoII 2]2+ fragment have been able to trap a monomethyl orthomolybdate in the binding pocket. Unusual coordination modes of substrate in dinuclear macrocyclic compounds was demonstrated.
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Yu, Gui-Miao, Lang Zhao, Li-Fei Zou, et al. "A Tetranuclear Nickel(II) Cubane Complex with O-Vanillin Ligand." Journal of Chemical Crystallography 41, no. 5 (2010): 606–9. http://dx.doi.org/10.1007/s10870-010-9932-2.

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Dong, Xindian, Xiaoyong Wang, Yafeng He, et al. "Reversible DNA Condensation Induced by a Tetranuclear Nickel(II) Complex." Chemistry - A European Journal 16, no. 47 (2010): 14181–89. http://dx.doi.org/10.1002/chem.201001457.

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Achiwawanich, Supakit, Tanwawan Duangthongyou, Panana Kitiphaisalnont, and Sutatip Siripaisarnpipat. "Tetranuclear nickel complex of dimethylene bridged diiminedioxime containing different hybridizations of nickel (II)." Journal of Molecular Structure 1072 (August 2014): 149–52. http://dx.doi.org/10.1016/j.molstruc.2014.04.090.

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Bizilj, K., SG Hardin, BF Hoskins, PJ Oliver, ERT Tiekink, and G. Winter. "The Structure of the Tetranuclear Cubane-Like Nickel(II) Xanthate Alkoxide [Ni(C2H5OCS2)-(C5H4NCH2O)]4 as Its Acetone Solvate, an Example of a Non-Reversible Inclusion Compound." Australian Journal of Chemistry 39, no. 7 (1986): 1035. http://dx.doi.org/10.1071/ch9861035.

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The crystal structure of the acetone solvate of a mixed ligand tetranuclear nickel(II) complex involving the pyridine-2-methoxide ( pym ) and 0-ethylxanthate (exa) anions has been determined by X-ray diffraction methods. Crystals of [Ni (exa)( pym )]4.Me2CO are triclinic, space group Pī , a 13.825(2), b 15.606(3), c 12.288(2)Ǻ, α 101.16(2), β 101.38(1), γ 85.80(1)°, with Z 2; R and Rw were 0.056 and 0.057 respectively for 4,771 unique reflections for which I ≥ 3σ(I). The structure consists of tetranuclear cubane -like clusters with four nickel and four oxygen atoms arranged at alternate corners of a distorted cube. The discrete molecules of occluded acetone are located in cavities defined by the [Ni( exa )( pym )]4 units.
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Xie, K. F., L. L. Li, W. D. Li, X. Xu, and W. K. Dong. "A novel tetranuclear nickel(II) salamo-based complex adopting two open cubic structures: synthesis, chracterization, DFT calculation, Hirshfeld analysis, and fluorescent properties." Журнал структурной химии 62, no. 6 (2021): 945–57. http://dx.doi.org/10.26902/jsc_id74421.

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A novel tetranuclear Ni(II) complex [Ni4(L)2(N3)4Cl(MeOH)3]·CH3COCH3 is synthesized via a symmetrical salamo-based ligand H2L, NiCl2·6H2O, and NaN3. The structure is characte­rized by elemental analyses, IR and UV-Vis spectroscopy, and X-ray diffraction analysis. The X-ray crystal analysis shows that Ni(II) atoms in the Ni(II) complex have distorted octahedral geometries. It is the key factor that the ligand containing 3-position methoxy groups gives rise to the formation of the tetranuclear Ni(II) complex. When NO3– anions are used to bridge two Ni2 atoms, there are two symmetrical open cubic structures. The Ni(II) complex forms a 3D supramolecular structure through intermolecular hydrogen bond interactions. Using the Hirshfeld surface to clarify interactions between the molecules, the percentages of C—H/H—C, O—H/H—O, and H—H/H—H contacts are calculated as 19.0 %, 15.3 %, and 54.0 %, respectively. Density functional theory (DFT) studies show that the stability of the Ni(II) complex is much higher than that of H2L. The calculation of the fluorescence titration experiment can give K = 1.05·108 M–1, which further proves the stability of the Ni(II) complex.
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Dissertations / Theses on the topic "Tetranuclear nickel(II) complex"

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Birtles, John. "Solution based studies of tetranuclear (mu₄-oxo)-Cu(II) complexes /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2004.

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Thesis (Ph.D.)--Tufts University, 2004.<br>The [mu] in the title is depicted as a Greek letter mu, followed by a subscript 4. Adviser: Samuel P. Kounaves. Submitted to the Dept. of Chemistry. Includes bibliographical references. Access restricted to members of the Tufts University community. Also available via the World Wide Web;
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Mattison, Rebecca Louise. "Fluorescent sensors to monitor Ni(II) in complex environments." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23039.

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Pollution from heavy metals will continue to depreciate the health of organisms and contaminate landscapes and water bodies; becoming progressively worse as time goes on. Nickel is one such heavy metal, and is known to cause a number of negative health effects by inducing asthma, conjunctivitis, pneumonitis, inflammation, skin allergies, lung fibrosis, infections in the respiratory tract, effects to the immune system, and cancer of the lungs, nose, sinuses, stomach and throat. Whilst nickel is a naturally occurring element in our environment, the major source of nickel dispersion is anthropogenic activities, which can be controlled and changed. To minimise and regulate nickel pollution, it is important to be able to monitor the concentration of nickel ions in a variety of media. The development of analytical tools to identify and quantify chemical species in complex fluids is of interest to many, from environmental scientists to forensic investigators to biological researchers. Fluorescent sensing offers the sensitivity required for such studies. The goal of this work is to develop a metal sensing system which is simple to use and can report on nickel concentrations, with an aim of working towards real-time on-site detection. This would contribute to monitoring heavy metal pollution in our environment. In order to determine suitable, selective, sensitive and applicable Ni(II) sensors, literature probes and derivatives were synthesised and analysed. Issues with selectivity of single probes were addressed by the study of combinatorial assays. Additional work on sensing systems led to the discovery of a simple method for optically detecting the ascorbate anion. Since nickel is a ubiquitous, highly valued metal that is encountered in everyday life, it is essential that monitoring its concentration in the environment is upheld. By utilising organic and analytical chemistry, sensing measurements can be improved which can lead to better practices.
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Ferretti, Eleonora. "Reductive Activation of Nitric Oxide and Nitrosobenzene at a Dinickel(II) Dihydride Complex and New Pyrazole-Based Diiron Compounds." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E594-D.

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Deb, Tapash K. "Bioinspired Redox Active Pseudotetrahedral Ni(II) Thiolate and Phenolate Complexes: Synthesis, Characterization, Alkylation Kinetics and Molecular Oxygen Activation." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1377256181.

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PETIT, JEAN-FRANCOIS. "Les squarates de lanthanoides : synthese, structure, comportement thermique et proprietes optiques, synthese et structure de dithiosquarates bimetalliques de nickel (ii) et de cerium (iii)." Toulouse 3, 1988. http://www.theses.fr/1988TOU30133.

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Cinq familles de composes isotypes ont ete identifiees en milieu aqueux. Etude radiocristallographique, comportement thermique dans differentes atmospheres, preparation du squarate de cerium anhydre et de trois nouvelles phases hydratees. Etude spectrometrique du derive de l'europium
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SANTOS, José Ribamar Nascimento dos. "COMPLEXO NÍQUEL(II)-BIS(1,10-FENANTROLINA) SUPORTADO EM ÓXIDO DE GRAFENO REDUZIDO PARA A ELETRO-OXIDAÇÃO DE ETANOL." Universidade Federal do Maranhão, 2017. https://tedebc.ufma.br/jspui/handle/tede/tede/1993.

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Submitted by Maria Aparecida (cidazen@gmail.com) on 2017-11-16T13:16:54Z No. of bitstreams: 1 JOSÉ RIBAMAR NASCIMENTO DOS SANTOS.pdf: 1283725 bytes, checksum: 4c5d6eba4cec82d8cb883aa89b0a81f6 (MD5)<br>Made available in DSpace on 2017-11-16T13:16:54Z (GMT). No. of bitstreams: 1 JOSÉ RIBAMAR NASCIMENTO DOS SANTOS.pdf: 1283725 bytes, checksum: 4c5d6eba4cec82d8cb883aa89b0a81f6 (MD5) Previous issue date: 2017-09-19<br>CAPES<br>The electro-oxidation of ethanol was evaluated on a pyrolytic graphite electrode (PGE) chemically modified with the nickel(II)-bis(1,10-phenanthroline) complex (Ni(II)(Phen)2) supported on reduced graphene oxide (RGO) (rGO/Ni(II)(Phen)2/PGE). The Ni(II)(Phen)2 complex, reduced graphene oxide (rGO) and the rGO/Ni(II)(Phen)2 composite were prepared and characterized by the techniques of Spectroscopy in the UV-Vis, Fourier Transform Infrared Spectroscopy and Diffraction of X-rays. The electrocatalytic activity of the material was evaluated by cyclic voltammetry and chronoamperometry. In alkaline solution, the voltamograms obtained for rGO/Ni(II)(Phen)2/PGE showed the formation of well defined redox peaks associated with the Ni(II)/Ni(III) redox couple. The results showed that the RGO/Ni(II)(Phen)2 composite significantly increases the electrocatalytic activity for ethanol oxidation compared to the electrode modified only with the Ni(II)(Phen)2 complex. Using the Laviron theory, the charge transfer rate constant (ks) and the electron transfer coefficient (α) of the electrode reaction were calculated to be 0.56 s-1 and 0.61, respectively. A investigation of the electro-oxidation of ethanol was performed by evaluating the effect of different parameters such as potential scan rate, OH- concentration and alcohol concentration. The chronoamperometric experiments were used to determine the diffusion coefficient of ethanol (D = 4.7 Χ 10-6 cm2 s-1) and the catalytic rate constant (kcat = 1.26 Χ 107 cm3 mol-1 s-1). The results obtained in this study clearly indicate the viability of rGO/Ni(II)(Phen)2/PGE as an electrocatalyst for ethanol oxidation.<br>A eletro-oxidação do etanol foi avaliada em um eletrodo de grafite pirolítico (PGE) quimicamente modificado com o complexo de níquel(II)-bis(1,10-fenantrolina) (Ni(II)(Phen)2) suportado em óxido de grafeno reduzido (rGO) (rGO/Ni(II)(Phen)2/PGE). O complexo Ni(II)(Phen)2, o óxido de grafeno reduzido (rGO), e o compósito rGO/Ni(II)(Phen)2 foram preparados e caracterizados pelas técnicas de Espectroscopia na região do UV-Vis, Espectroscopia de Infravermelho com Transformada de Fourier e Difração de Raios X. A atividade eletrocatalítica do material foi avaliada por voltametria cíclica e cronoamperometria. Em solução alcalina, os voltamogramas obtidos para rGO/Ni(II)(Phen)2/PGE mostraram processos redox bem definidos associados ao par redox Ni(II)/Ni(III). Os resultados mostraram que o compósito rGO/Ni(II)(Phen)2 aumenta significativamente a atividade eletrocatalítica para a oxidação do etanol em comparação com o eletrodo modificado apenas com o complexo Ni(II)(Phen)2 adsorvido na superfície do eletrodo. Usando a teoria de Laviron, a constante de velocidade de transferência de carga (ks) e o coeficiente de transferência de elétrons (α) da reação do eletrodo foram calculados sendo 0,56 s-1 e 0,61, respectivamente. Uma investigação da eletro-oxidação do etanol foi realizada avaliando o efeito de diferentes parâmetros, como a velocidade de varredura do potencial, a concentração de OH- e a concentração de álcool. Os experimentos cronoamperométricos foram utilizados para determinar o coeficiente de difusão do etanol (D = 4,7 Χ 10-6 cm2 s-1) e a constante de velocidade catalítica (kcat = 1,26 Χ 107 cm3 mol-1 s-1). Os resultados obtidos neste estudo indicam, claramente, a viabilidade do rGO/Ni(II)(Phen)2/PGE como eletrocatalisador da oxidação de etanol.
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Lee, Chia-Hua, and 李佳樺. "Nickel(II)-thiolate-thiol complex: relevance to [NiFe] hydrogenase." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/973m33.

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碩士<br>國立清華大學<br>化學系<br>92<br>Reaction of Ni(ClO4)2．6H2O with 1 equiv. of P(o-C6H4SH)3 in THF leads to the formation of a dimeric complex, Ni2{P(o-C6H4S)2(o-C6H4SH)}2 (1). Complex 1 contains distorted square planar, diamagnetic Ni(II) centers ligated by a phosphorus, a terminal thiolate, two thiolates that bridge to the second Ni, and a S-H proton directly interacting with both nickel and sulfur atoms. The presence of combination of intramolecular [Ni-S…H-S] /[Ni…H-S] interactions was verified in the solid state by the observation of IR νSH stretching band (2391cm-1), 1H NMR (δ5.880(s) in CDCl3) and subsequently confirmed by X-ray diffraction study. Isolation and characterization of complex 1 may reflect the existence of Ni-R/Ni-SIa atates as [(Scys-H)Ni(Scys)3Fe] corrdination environment in [NiFe] hydrogenase. Reaction of Ni(ClO4)2．6H2O with 2 equiv. of P(o-C6H4SH)3 in THF results in the formation of mononuclear and square planar complex, Ni{P(o-C6H4S)(o-C6H4SH)2}2 (3) with four S-H protons, where Nickel is coordinated by two sulfurs and two phosphorus. X-ray diffraction study indicate that two bulky ligands, {P(o-C6H4S)(o-C6H4SH)2}, keeps S-H proton away from nickel and sulfur atoms and there were weak intramolecular [Ni-S…H-S] /[Ni…H-S] interactions in complex 3. The thiol proton in complex 1 and 3 was easily removed by Lewis base Et3N to yield the known Ni(II) dimer [NiII(P(o-C6H4S)3)]22- (2). The hexacoordinate Fe(II) complex [PPN][Fe(CO)2(CN)(S,NH2-C6H4)(S-C6H4NH2) (5) was prepared by the reaction of 2-aminophenyl disulfide and [PPN][Fe(CO)4(CN)]. Upon contact with dry O2, or treated with Lewis base Et3N, complex 5 turned to the pentacoordinate Fe(II) complex [PPN][Fe(CO)2(CN)(S,NH-C6H4)] (6).
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CHINE-CHANG, CHEN, and 陳建彰. "The kinetics of Dissociation and Isomerization of Nickel(II) Macrocyclic Complex." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/62018320189405651842.

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碩士<br>東海大學<br>化學系<br>87<br>ABSTRACT (1) Kinetics of dissociation and isomerization of hexaaza- macrocyclic nickel (II) complexes： The dissociation kinetics of hexaazamacrocyclic nickel (II) complexes has been studied spectrophotometrically in different pH at 25.0 *0.5℃ under m=0.5 (NaClO4) phosphate buffer solution. Using the computer equation and comparison with equation kobsd＝ka[H+] + kw + kOH－[OH－] + kHB[HB] + kB[B] in different pH, the resulting values of k1, k2, k3 and k4. When pH＜5.0, reaction is undergoes the dissociation process, The reaction scheme is following: the results is suggest series Me＜Et＜Pr. Equation can fit with kobsd＝ka[H+] + kw + kHB[HB]. When pH * 7.0, reaction is under -goes association process, the cis-complexes turns to trans- complexes. The reaction scheme is following: The series is Pr＜Et＜Me, equation can fit with kobsd＝ kw + kOH－[OH－] + kB[B]. When pH between 5.0 and 7.0 the dissociation and isomerization process can be found at the same time. The kobsd can find the maximum values with computer calculation. (2) Kinetics of acid-catalyzed dissociation of hexaaza- macrocyclic nickel (II) complexes with different metal ions ： Measure the catalysis dissociation reaction of hexaaza-macrocyclic Nickel (II) complexes react with metallic ion like Al3+, Be2+, Cu2+, Zn2+ etc., at . at 25.0 *0.5℃ under m=0.5 (NaClO4)and pH=3.0 formic acid buffer solution. We found the dissociation process becomes faster and the series is Al3+＞ Be2+＞ Cu2+＞ Zn2+, the equation can fit with kobsd＝ka[H+] + kw + kHB[HB] + kM[M], and the kM is the metallic ion dissociation constant.
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Lee, Heui Beom. "Electronic Structure and Spectroscopy of Tetranuclear Mn4O4 and CaMn3O4 Complexes as Models of the Oxygen Evolving Complex in Photosystem II." Thesis, 2019. https://thesis.library.caltech.edu/11420/21/HBL_thesis_revised.pdf.

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<p>This thesis describes a series of studies devoted toward the synthesis of model complexes that mimic aspects of structure, redox state, and spectroscopy of the oxygen evolving complex (OEC) of Photosystem II. The OEC is a unique metallocofactor featuring a heteronuclear CaMn<sub>4</sub> core that catalyzes water oxidation. While advances in spectroscopic and structural techniques offer an ever more detailed view of the structure of the S-state catalytic intermediates, the precise mechanism of O−O bond formation remains debated. Aspects such as (1) role of Ca<sup>2+</sup>, (2) the location of the substrate waters, and (3) the (electronic) structure of the S-state intermediates remain unclear. To obtain a better understanding of the OEC, systematic structure−function(property) studies on relevant model complexes may be necessary. Despite significant efforts to prepare tetra- and pentanuclear complexes as models of the OEC, relevant complexes in terms of structure, redox state, spectroscopy, and reactivity are rare, likely due to the synthetic challenges of accessing a series of isolable clusters that are suitable for comparisons.</p> <p>Chapter 1 presents a survey of tetramanganese model compounds with an emphasis on redox state and electronic structure, as probed by magnetometry and EPR spectroscopy. Structurally characterized model complexes are grouped according to Mn oxidation states and the S-state that they are mirroring. In contrast to the vast number of spectroscopic studies on the OEC, studies that probe the effect of systematic changes in structure on the spectroscopy of model complexes are rare in the literature.</p> <p>Chapter 2 presents ongoing synthetic efforts to prepare accurate structural models of the OEC. The synthesis of accurate structural models is hampered by the low structural symmetry of the cluster, the presence of two types of metals, and the propensity of oxo moieties to form extended oligomeric structures. Desymmetrization of the previously reported trinucleating ligand leads to the formation of tetranuclear Mn<sub>4</sub><sup>II</sup> precursors. Oxidation in the presence of Ca<sup>2+</sup> leads to a CaMn<sub>4</sub>O<sub>2</sub> model of the OEC, underscoring the utility of low-symmetry multinucleating ligands in the synthesis of hitherto unobserved oxo-bridged multimetallic core geometries related to the OEC.</p> <p>Chapter 3 presents a series of [Mn<sup>III</sup>Mn<sub>3</sub><sup>IV</sup>O<sub>4</sub>] cuboidal complexes as spectroscopic models of the S<sub>2</sub> state of the OEC. Such complexes resemble the oxidation state and EPR spectra of the S<sub>2</sub> state, and the effect of systematic changes in the nature of the bridging ligands on spectroscopy was studied. Results show that the electronic structure of tetranuclear Mn complexes is highly sensitive to even small geometric changes and the nature of the bridging ligands. Model studies suggest that the spectroscopic properties of the OEC may also react very sensitively to small changes in structure; the effect of protonation state and other reorganization processes needs to be carefully assessed.</p> <p>Chapter 4 presents a series of [YMn<sub>3</sub>O<sub>4</sub>] complexes as models of the [CaMn<sub>3</sub>O<sub>4</sub>] subsite of the OEC. The effect of systematic changes in the basicity and chelating properties of the bridging ligands on redox potential was studied. Results show that in the absence of ligand-induced geometric distortions that enforce a contraction of metal-oxo distances, increasing the basicity of the ligands results in a decrease of cluster reduction potential. A small contraction of metal-oxo/metal-metal distances by ~0.1 Å enforced by a chelating ligand results in an increase of cluster reduction potential even in the presence of strong basic donors. Such small, protein-induced changes in Ca-oxo/Ca-Mn distances may have a similar effect in tuning the redox potential of the OEC through entatic states, and may explain the cation size dependence on the progression of the S-state cycle.</p> <p>Chapter 5 presents a series of [CaMn<sub>3</sub>O<sub>4</sub>] and [YMn<sub>3</sub>O<sub>4</sub>] complexes as models of the [CaMn<sub>3</sub>O<sub>4</sub>] subsite of the OEC. The effect of systematic changes in cluster geometry, heterometal identity, and bridging oxo protonation on cluster spin state structure was studied. Results show that the electronic structure of the Mn<sub>3</sub><sup>IV</sup> core is highly sensitive to small geometric changes, the nature of the bridging ligands, and the protonation state of the bridging oxos: the spin ground states of essentially isostructural compounds can be S = 3/2, 5/2, or 9/2. Interpretation of EPR signals and subsequent structural assignments based on an S = 9/2 spin state of the CaMn<sub>3</sub>O<sub>4</sub> subsite of the OEC must be done very cautiously.</p> <p>While unfinished, appendices 1 and 2 present other important aspect in OEC model chemistry. Appendix 1 presents the synthesis of <sup>17</sup>O-labeled [Mn<sup>III</sup>Mn<sub>3</sub><sup>IV</sup>O<sub>4</sub>] and [CaMn<sub>3</sub><sup>IV</sup>O<sub>4</sub>] complexes as models of the OEC. Ongoing characterization of μ<sup>3</sup>-oxos in such complexes provide valuable benchmarking parameters for future mechanistic studies. Appendix 2 presents the synthesis and characterization of [Mn<sub>4</sub><sup>IV</sup>O<sub>4</sub>] cuboidal complexes as spectroscopic models of the S<sub>3</sub> state of the OEC, the last observable intermediate prior to O−O bond formation at the OEC.</p>
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Sheu, Shuenn Yih, and 許順益. "Ternary Complex Formation Kinetics Involving Nickel(II) Tetraamine Complexes and Bidentate Ligands." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/60714198699945929648.

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Books on the topic "Tetranuclear nickel(II) complex"

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Tilus, Pirkko. The formation of aqueous binary and ternary nickel(II) complexes of nitrogen- and carbon-alkylated ethylenediamines, exhibiting octahedral and square planar species. Suomalainen Tiedeakatemia, 1985.

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Davis, William Michael. 1. Synthesis, structure and properties of an imidazolate bridged CU(II)-Co(III) complex ; 2. Synthesis, structures and properties of nickel (II) and copper (II) tropocoronand complexes. 1985.

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Book chapters on the topic "Tetranuclear nickel(II) complex"

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of tetranuclear nickel(II) complex with pyridyldicarboxamide derivative." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 6. Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-65056-1_290.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of tetranuclear nickel(II) chlorate complex of macrocyclic ligand." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-45972-0_564.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of tetranuclear nickel(II) acetate complex of macrocyclic ligand." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-45972-0_563.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of tetranuclear nickel(II) butterfly complex stabilized by pivalate ligand." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 3. Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62470-8_101.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of tetranuclear azido bridged nickel(II) complex with dinucleating pyrazole ligand." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 5. Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-65098-1_349.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of tetranuclear azido bridged nickel(II) complex with dinucleating pyrazole ligand." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 5. Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-65098-1_348.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of tetranuclear nickel(II) complex with β-diketone-functionalized pyridine carboxylate ligand." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 6. Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-65056-1_289.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of tetranuclear nickel(II) complex with O-bridged urea and phenol-containing Schiff-base." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 3. Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62470-8_303.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of tetranuclear azido bridged nickel complex with dibenzoylmethane." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54234-7_459.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of tetranuclear methoxy bridged nickel complex with dibenzoylmethane." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54234-7_460.

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Conference papers on the topic "Tetranuclear nickel(II) complex"

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Krishnan, Karthik, Cheng Chau Lum, and Arpana Verma. "Corrosion and Cracking Performance of Stainless Steels and Nickel Alloys in CCS Environments - Part II." In CONFERENCE 2025. AMPP, 2025. https://doi.org/10.5006/c2025-00429.

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Abstract Carbon Capture and Storage (CCS) technology which involves capturing CO2 and injecting into geological formations is seen as a focus area for reducing CO2 emissions and sustainable future. One of the key challenges for CCS is material selection for construction of wells for injection and storage where the materials can be subjected to a complex environmental mix with various impurities present in the CO2 stream along with different phases within the well. Knowledge and understanding of corrosion and cracking performance of various materials in different environmental conditions relevant to CCS wells can provide a basis for material selection. Being a relatively new field there is an effort to build up knowledge base via testing, characterizing materials suitable for long term well service. In this study, which is continuation of work published last year, supermartensitic, duplex stainless steels along with Precipitation Hardenable (PH) Nickel Alloys were tested for both corrosion and cracking performance in low pH corrosive CCS type environments. The testing simulated exposure to injected fluid phase, interface between injected fluid and water phase and completely immersed in water phase. The details of testing performed results obtained along with discussions is presented so that it can provide guidance on material compatibility in the more corrosive CCS environments.
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Jakab, Marta A., Narasi Sridhar, and Andre M. Anderko. "Localized Corrosion Susceptibility of Copper-Nickel Alloys in Chloride Containing Environments." In CORROSION 2007. NACE International, 2007. https://doi.org/10.5006/c2007-07243.

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Abstract Under alkaline conditions, copper-nickel alloys are covered by passive oxide films containing Cu and Ni oxides. In chloride ion containing environments, they are therefore susceptible to localized corrosion. In this paper, the susceptibility of selected Cu-Ni alloys (UNS C70600, UNS C71500 and UNS N04400) to localized corrosion was investigated by measuring the crevice stabilization and repassivation potentials (Ecrev and Ercrev, respectively) in alkaline sodium chloride solutions. Correlations between environmental variables, such as chloride ion concentration, pH and temperature and Ecrev, as well as Ercrev were established. It was found that: (i) Ecrev and Ercrev decrease with increasing chloride ion concentration; (ii) there is a linear relationship between Ecrev and Ercrev and the logarithm of chloride ion concentration; (iii) Ercrev does not depend on the solution pH; (iv) there is a complex relationship between Ecrev and Ercrev and the alloy composition as well as the temperature. The electrochemical properties of the selected alloys were also investigated in synthetic seawater with and without the presence of free chlorine. It was found that the pitting and repassivation potentials in synthetic seawater are strongly dependent on the alloy composition. The presence of free chlorine did not significantly affect the cathodic reaction kinetics. It, however, increased the corrosion potential and changed the corrosion morphology.
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Weheabby, Saddam, Ammar Al-Hamry, Salem Nasraoui, Tobias Ruffer, and Olfa Kanoun. "A mononuclear nickel(II) complex as a redox mediator for electrochemical sensors." In 2022 19th International Multi-Conference on Systems, Signals & Devices (SSD). IEEE, 2022. http://dx.doi.org/10.1109/ssd54932.2022.9955958.

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Martak, Fahimah, Nofri Eka Safitri, Endah Mutiara Marhaeni Putri, Agung Bagus Pambudi, and Arif Fadlan. "Synthesis and anticancer study of complex nickel (II) 5,7-dibromoisatin-derived hydrazine carbothiamide." In THE 14TH JOINT CONFERENCE ON CHEMISTRY 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0005731.

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Courtney, S. H., T. M. Jedju, J. M. Friedman, et al. "Nickel(II) Octaethylporphyrin: Conformational Dynamics, Ligand Binding and Release." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1990. http://dx.doi.org/10.1364/up.1990.mc11.

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Metalloporphyrins are important in a variety of biological functions, such as oxygen transport, electron transfer, and energy conversion. To understand their ability to bind ligands and participate in electron transfer reactions, the excited state dynamics of these complex molecules must be elucidated. In non-coordinating solvents, photoexcitation of NiOEP leads to the formation of a relatively long lived excited state (*Blg) that decays to the 1Alg ground state in ≈300ps(1,2). To further investigate the excited state dynamics, we undertook a subpicosecond transient absorption study in chloroform and methylene chloride. We observed the appearance of transient absorption bands in &lt;2ps and spectral evolution of the transient bands (see figure 1).
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Chen, Zhimin, Yiqun Wu, Donghong Gu, and Fuxi Gan. "Optical and thermal properties of nickel(II) hydrazone complex for recordable blu-ray storage." In Photonics and Optoelectronics Meetings 2009, edited by Masud Mansuripur, Changsheng Xie, and Xiangshui Miao. SPIE, 2009. http://dx.doi.org/10.1117/12.843215.

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Shamsuddin, Roshatiara binti, and Nurul Huda Abd Karim. "Synthesis and characterization of N,N’-bis[4-[1-(2-hidroxyethoxy)]salicylidine]-phenyldiamine-nickel(II)] complex." In THE 2016 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2016 Postgraduate Colloquium. Author(s), 2016. http://dx.doi.org/10.1063/1.4966745.

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Direm, Amani, Brahim El Bali, Mohammed Lachkar, Esra Çetiner, Koray Sayin, and Michal Dusek. "Towards quantitative analysis of the non-covalent interactions in a newly synthesized phenanthroline-based nickel(II) complex: A combined experimental and computational study." In 6th International Electronic Conference on Medicinal Chemistry. MDPI, 2020. http://dx.doi.org/10.3390/ecmc2020-07512.

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Xia, Hai-Tao, Yu-Fen Liu, and De-Fu Rong. "Study on the interaction of N1-(1-phenylethyl) propane-1,2-diamine Nickel(II) complex and bovine serum albumin by fluorescence spectra." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5966018.

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Dobrovska, Jana, Simona Zla, Frantisek Kavicka, Bedrich Smetana, and Vlastimil Vodarek. "Study of Thermo-Physical Properties of Selected Nickel-Based Superalloys With Use of DTA Method." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82975.

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The presented paper deals with study of thermo-physical properties of cast complex alloyed nickel based superalloys IN713LC, IN738LC and IN792-5A. In this work the technique of Differential Thermal Analysis was selected for acquisition and comparison of the phase transformation temperatures. The samples taken from superalloys in as received state were analysed at heating and cooling rates of 1, 5, 10, and 20 K/min using the experimental system Setaram SETSYS 18TM. Moreover, the transformation temperatures for zero heating/cooling rate were calculated. Based on a comparison of these temperatures it is possible to make the following conclusions: (i) The alloy IN792-5A has the highest temperature of solubility of the strengthening phase γ′ (1235°C); (ii) the highest liquidus temperature (heating) obtained by extrapolation was found in the alloy IN713LC (1349°C), the lowest solidus temperature (heating) was found for the alloy IN738LC (1212°C); (iii) At cooling an undercooling occurred in all alloys. In general it may be stated that the biggest under-cooling (TS, 47°C) was recorded in the alloy IN792 5A; (iv) The width of the interval of the heat treatment window was the biggest in alloy IN713LC (44°C); (v) The alloy IN738LC is characterised by the widest interval of melting (124°C) and solidification (134°C), while the alloy IN792 5A has the narrowest interval of melting (82°C) and at the same time almost the same interval of solidification as the alloy IN738LC (129°C); (vi) The obtained phase transformation temperatures were compared with the values of phase transformations temperatures calculated on the basis of established relationships. In order to obtain more precise description of the behaviour of Ni-based superalloys, during controlled heating/cooling of the initial material (as received state) during DTA analyses, all the samples of superalloys were subjected to a phase analysis using scanning electron microscopy. The course of phase transformations, in all the studied superalloys (IN713LC, IN738LC, IN792 5A) is likely to run according to the following reaction scheme (L = melt): L ↔ γ, L ↔ γ + MC, L ↔ γ/γ′, L ↔ γ + minority phases (such as M3B2, phase η), γ ↔ γ′.
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