13408-73-6Relevant academic research and scientific papers
Synthesis and spectral characterization of cobalt(III) complexes of N-(o-carboxyphenyl)iminodiacetic acid
Chatterjee, Chinmay,Singh, Rajendrasen S.,Phulambrikar, Alka,Das, Subroto
, p. 159 - 162 (1988)
The complexes [Co(cpida)(N-N)]·nH2O [H3cpida = N-(o-carboxyphenyl)iminodiacetic acid, N-N = ethylenediamine, 1,2-diaminopropane, or 1,3-diaminopropane] have been synthesized from trans-[Co(N-N)2Cl2]+
1H MAS NMR study of local structure and dynamics of water molecule in (±)-[Co(en)3]Cl3·nD2O
Ueda, Takahiro,Nakamura, Nobuo
, p. 13681 - 13687 (2003)
Dependence of the local structure and dynamic behavior of hydration water in (±)-[Co(en)3]Cl3·nD2O crystal (0 ≤ n ≤ 4) on the dehydration process was studied by means of 1H magic-angle sample spinning (MAS) NMR technique. The line shape in the 1H MAS NMR spectrum depends strongly on the water content (n). For n ≤ 1.5, the spectrum consists mainly of two peaks whose relative intensities change with n, suggesting that the hydration water forms two different types of domainlike structures at room temperature. In addition, the full width at half-maximum of each component of the doublet was less than 1 ppm at room temperature, implying that the water moves rapidly enough to reduce the intermolecular 1H-1H dipole interaction. On cooling, the resonance line broadens and its line width exceeds 10 ppm below 200 K where the components of the doublets cannot be discerned. This aspect suggests that the water molecule undergoes slower motion than the MAS rate (5.0-7.0 kHz). The temperature dependence of the line width was analyzed by assuming the Davidson-Cole's spectral density. The activation energy (Ea) for the molecular motion of the water depends drastically on the water content: Ea assumes the constant value of 24 kJ mol-1 for n ≤ 2.1, but it decreases continuously for n > 2.1 and reaches 18 kJ mol-1 at n = 4. This finding suggests that the molecular motion of hydration water in the pore, which averages out the dipolar interaction between a trace amount of HDO and the protons on the pore wall, changes from whole molecular translational jump to proton migration through hydrogen bond accompanied by molecular reorientation.
The infra-red spectrum of Cl3*3T2O (en:ethylenediamine)
Kaneasaka, Isao,Nishimura, Hiroyuki,Kanamori, Kan,Kawai, Kiyoyasu,Ichimura, Kenji,Watanabe, Kuniaki
, p. 817 - 822 (1987)
The infra-red spectrum of Cl3*2T2O has been observed over a period of 5 months.The spectrum changes considerably even in 2 days after preparation of the hydrate, revealing quite different features from the parent.Initially some bands due to the NH2 group disappear, while new bands appear.These are explained in terms of a change in bonding character or as an interaction between the complex ion and the chloride anion in the crystal.Subsequently, the bands due to ethylenediamine decrease in intensity and almost vanish, while additional new bands appear.The new bands are explained in terms of amine complexes.It is proposed that a decomposition reaction of takes place through intermediates such as vinylamine and so on.After one month the spectrum still changes slowly with further new bands due to a H-T exchange reaction.
High-pressure 129Xe NMR study of xenon confined in the nanochannels of solid (?±)-[Co(en)3]Cl3
Ueda, Takahiro,Eguchi, Taro,Nakamura, Nobuo,Wasylishen, Roderick E.
, p. 180 - 185 (2003)
High-pressure 129Xe NMR measurements were carried out on dehydrated (?±)-[Co(en)3]Cl3 to investigate the pore size as well as the local structure about the confined xenon atoms. At xenon gas pressures of 0.3 MPa, the xenon chemical shift was orientation dependent, exhibiting an axially symmetric powder pattern with ??11= 280 ppm and ??22 = ??33 = 180 ppm. Proton to 129Xe cross-polarization (CP) experiments selectively enhanced the portion of the powder pattern corresponding to ??22 = ??33 = ??a?￥, confirming that the unique component of the chemical shift tensor, ??11 = ??a?￥, lies along the pore axis. The isotropic chemical shift ??iso at the zero pressure limit was found to be 212 ppm, and suggested a pore diameter of approximately 0.47 nm. This agrees well with the diameter of 0.44 nm estimated from the crystal structure. On increasing the pressure to 6.5 MPa, ??a?￥ increased from 180 to 220 ppm, whereas ??a?￥ was found to be almost independent of pressure. The increase in ??a?￥ with pressure is attributed to Xe-Xe interactions. The paramagnetic shift in the xenon chemical tensor component perpendicular to the nanochannels with increasing pressure is in accord with the recent theoretical predictions of Jameson and de Dios (J. Chem. Phys. 2002, 116, 3805) and Jameson (J. Chem. Phys. 2002, 116, 8912).
Gas-conforming transformability of an ionic single-crystal host consisting of discrete charged components
Takamizawa, Satoshi,Akatsuka, Takamasa,Ueda, Takahiro
, p. 1689 - 1692 (2008)
(Figure Presented) Dynamic accommodation: The racemic crystal of (±)-[Co(en)3]Cl3 (en = ethylenediamine; see space-filling model of lattice: Co red, N blue, Cl green, C gray) includes H2O molecules within the one-dimensional channels when hydrated. Upon removal of the H2O molecules by vacuum drying, the crystal exhibits dynamic behavior as a host to a variety of light gases or organic vapors within its channels by expansion/contraction of the lattice while single-crystal properties are maintained.
Copper(II)-diaminosarcophagine-functionalized SBA-15: A heterogeneous nanocatalyst for the synthesis of benzimidazole, benzoxazole and benzothiazole derivatives under solvent-free conditions
Bardajee, Ghasem Rezanejade,Mohammadi, Marzieh,Kakavand, Nahale
, p. 51 - 58 (2016/04/05)
Solvent-free organic reactions were studied over periodic mesoporous silica (SBA-15) containing a Cu(II) organometallic complex. This heterogeneous catalyst was achieved by coordination of Cu(II) ions with the diaminosarcophagine ligand and then its grafting onto the surface of SBA-15. This catalyst displayed ordered mesoporous channels, which implies an extremely high dispersion of the Cu(II) complex and the convenient diffusion of reactant molecules into the pore channels. Therefore, this catalyst can offer high activity and also facile separation or recycling when compared with its homogeneous counterparts.
Spectroscopic and electrochemical study of the adsorption of [Co(en) 2Cl2]Cl on γ-alumina: Influence of the alumina ligand on Co(III)/(II) redox potential
Vivier, Vincent,Aguey, Francois,Fournier, Jeanine,Lambert, Jean-Francois,Bedioui, Fethi,Che, Michel
, p. 900 - 906 (2008/10/09)
UV-visible and Raman spectroscopies as well as electrochemical techniques have been used to characterize cis- and trans-[Co(III)(en) 2Cl2]Cl (en = ethylenediamine) complexes and the γ-alumina-supported cis-Co(III) complex. It is shown that the electrochemical reduction of these complexes occurs according to a multistage mechanism involving two electrochemical steps, with the formation of a dimer that was characterized by UV-visible spectroscopy (intervalence band at 670 nm). The apparent standard redox potential for each step has been determined, and experimental results reveal that cis and trans complexes present similar electrochemical characteristics. It is also shown that the deposition of trans-[Co(III)(en)2Cl2]+ on γ-alumina leads to an inner-sphere complex (ISC) in a cis configuration in which Cl- ligands are substituted by OH or O- surface groups of alumina. These changes in the coordination sphere of the complex induce a substantial decrease of its apparent redox potential since it is -0.63 V/SCE (saturated calomel electrode) for the γ-alumina-supported cis-Co(III) complex, whereas values of -0.17 and -0.35 V/SCE were determined in dimethyl sulfoxide (DMSO) for the trans and cis precursor complexes, respectively.
Inter- and intra-molecular pathways in polyamine synthesis from diamines
Choi, Min-Ho,Kim, Bok Jo,Kim, Il-Chool,Kim, Seo-Hyang,Kim, Yang,Harrowfield, Jack M.,Lee, Man-Kil,Mocerino, Mauro,Rukmini, Elisabeth,Skelton, Brian W.,White, Allan H.
, p. 707 - 722 (2007/10/03)
Characterisation, largely through crystal structure determinations of their metal complexes, of the polyamine products of several reactions between (in all but one case) polyalcohol benzenesulfonates and 1,2- and 1,3-diamines, confirmed that intramolecular reaction pathways are important only in the 1,2-diamine reactions. Even under conditions where the amine reactants are in large excess, however, it is possible to obtain products resulting from alkylation of a diamine by more than one molecule of sulfonate (or, in one case, of a bromochloroalkane). In metal ion complexes formed by the new ligands there are examples of only partial coordination of the N-donor sites, giving species which might be suitable for further, selective functionalisation at the unbound centres. Conversion of the complexes into macrocyclic derivatives also suited to further functionalisation is straightforward.
Preparation and characterization of some cobalt (III) complexes of 2-aminomethylbenzimidazole
Gable, Robert W.,Hartshorn, Richard M.,David McFadyen,Nunno, Linda
, p. 625 - 632 (2007/10/03)
The coordination chemistry of 2-aminomethylbenzimidazole (ambi) has been studied with cobalt(III), and the cationic complexes fac-[Co(ambi)3]3+, asym-[Co(en)(ambi)2]3+ and [Co(en)2(ambi)]3+ have been prepared. The last cation, in the form of the chloride salt [Co(en)2(ambi)] Cl3.H2O, has been structurally characterized: monoclinic, space group P21/c, a 7.6692(14), b 14.954(2), c 15.941(3) A, β 92.64(2)°, Z 4.
Preparation and Stereochemistry of Cobalt(III) Complexes Containing 1,1,10,10-Tetraphenyl-4,7-diaza-1,10-diphosphadecane or 2,11-Dimethyl-5,8-diaza-2,11-diphosphadodecane, R2PCH2CH2NHCH2CH2NHCH2CH2PR2 (R = C6H5 or CH3)
Atoh, Masamichi,Kashiwabara, Kazuo,Fujita, Junnosuke
, p. 2793 - 2797 (2007/10/02)
New quadridentate phosphine ligands, 1,1,10,10-tetraphenyl-4,7-diaza-1,10-diphosphadecane (pp-PNNP) and 2,11-dimethyl-5,8-diaza-2,11-diphosphadodecane (mm-PNNP), were prepared from (ClCH2CH2NHCH2-)2*2HCl and NaPR2 (R = C6H5, CH3) and purified through their Ni(II) complexes.Seven new cobalt(III) complexes containing the phosphine ligand were prepared: (n+) (X2 = (Cl)2, (NCS)2, C5H7O2(1-) (2,4-pentanedionate ion), and CO3(2-)).Four complexes of (1+) (X = Cl, NCS) afforded only a trans(X,X) isomer, and (2+) and (1+) complexes yielded a cisβ isomer.The geometrical structures were assigned on the basis of the NMR and visible-ultraviolet absorption spectra.
