13408-73-6Relevant articles and documents
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]+
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.
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.
