97-77-8Relevant academic research and scientific papers
Self-Healing Molecular Crystals
Commins, Patrick,Hara, Hideyuki,Naumov, Pan?e
, p. 13028 - 13032 (2016)
One of the most inevitable limitations of any material that is exposed to mechanical impact is that they are inexorably prone to mechanical damage, such as cracking, denting, gouging, or wearing. To confront this challenge, the field of polymers has developed materials that are capable of autonomous self-healing and recover their macroscopic integrity similar to biological organisms. However, the study of this phenomenon has mostly remained within the soft materials community and has not been explored by solid-state organic chemists. The first evidence of self-healing in a molecular crystal is now presented using crystals of dipyrazolethiuram disulfide. The crystals were mildly compressed and the degree of healing was found to be 6.7 %. These findings show that the self-healing properties can be extended beyond mesophasic materials and applied towards the realm of ordered solid-state compounds.
Synthesis and Properties of Tetra-4-{[(1,1'-biphenyl)-4-yl]oxy}phthalocyanines and Their Sulfonic Acid Derivatives
Tikhomirova,Peledina,Maizlish,Vashurin,Shaposhnikov
, p. 742 - 750 (2018)
The template condensation of 4-{[(1,1'-biphenyl)-4-yl]oxy}phthalonitrile with cobalt, copper, and magnesium acetate resulted in the synthesis of metal phthalocyanines. Sulfochlorination of the latter followed by hydrolysis gave the corresponding sulfonic acid derivatives. The spectral characteristics and chemical properties of the synthesized compounds were studied.
A new water-soluble sulfonated cobalt(II) phthalocyanines: Synthesis, spectral, coordination and catalytic properties
Vashurin, Artur,Filippova, Anna,Znoyko, Serafima,Voronina, Alena,Lefedova, Olga,Kuzmin, Ilya,Maizlish, Vladimir,Koifman, Oscar
, p. 983 - 996 (2015)
Novel complexes of cobalt(II) with sulfonated derivatives of phthalocyanines are synthesized. The influence of the sulfonated group's number in peripheral substituent on solubility of macrocycle and ability to form ordered structures in solution is showed. Transition from H-aggregates to monomeric phthalocyanine structures and sandwich-type dimers was found during formation of metallophthalocyanine complexes with 1,4-diazabicyclo[2.2.2]octane. The catalytic activity of metallophthalocyanines was studied on the model of Merox process
Catalytic properties of cobalt complexes with tetrapyrazino porphyrazine and phthalocyanine derivatives
Vashurin,Kuzmin,Litova,Petrov,Pukhovskaya,Golubchikov
, p. 2064 - 2067 (2014)
The catalytic activity of cobalt complexes with octaphenyltetrapyrazinoporphyrazine and phthalocyanine derivatives containing branched peripheral substituents is studied in heterogeneous catalysis of the oxidation of sodium diethyldithiocarbamate (SDC) with atmospheric oxygen. Cobalt phthalocyanines are shown to display higher catalytic activity than cobalt complexes with octaphenyltetrapyrazinoporphyrazine. The highest efficiency of heterogeneous catalysts is attained at temperatures of 298-303 K.
ESR spectra and electronic structure of the MoO3+ complex with the dithiocarbamate ligand
Rakitin,Ivanov
, p. 2073 - 2076 (1999)
ESR spectra of liquid and frozen benzene solutions of isotope-enriched 95,97,98MoVO(dtc)3 complexes ([xMo] > 95%, dtc is the N,N-diethyl dithiocarbamate ligand) and their solid solutions in a matrix of tetraethylthiuram disulfide were studied in the X-range. Comparison of the experimental and calculated parameters of the ESR spectra shows that the axial symmetry of the magnetic tensors does not contradict the low symmetry of the complex, in which the "ylic" oxygen and five of six S atoms in three dithiocarbamate ligands form the coordination sphere of the metal.
Non-covalent associates of metal phthalocyanines: the role of axial ligand and catalytic activity
Vashurin
, p. 2220 - 2228 (2016)
The problem about the role of the coordinated exobidentate ligand in the formation of dimeric structures of sulfonated cobalt phthalocyanine derivatives is considered. The size of the peripheral substituent of the macrocycle and remoteness of the ionogenic group from the macrocycle play the key role in the formation of dimers of a specified type. As the extension of the peripheral substituent of the macrocycle increases, the stability of dimeric associates of the Н-type decreases and that of the associates formed due to the donor—acceptor interaction (J- and Т-aggregates) increases. The latter can be stabilized by hydrogen bonds at the periphery of the macromolecule. A series of catalytic activity of the macrocycles under study is inverted compared to the series of stability of the H-dimers.
Electrochemically Controlled Cationic Polymerization of Vinyl Ethers
Peterson, Brian M.,Lin, Song,Fors, Brett P.
, p. 2076 - 2079 (2018)
Control of polymer initiation, propagation and termination is important in the development of complex polymer structures and advanced materials. Typically, this has been achieved chemically, electrochemically, photochemically or mechanochemically. Electrochemical control has been demonstrated in radical polymerizations; however, regulation of a cationic polymerization has yet to be achieved. Through the reversible oxidation of a polymer chain end with an electrochemical mediator, temporal control over polymer chain growth in cationic polymerizations was realized. By subjecting a stable organic nitroxyl radical mediator and chain transfer agent to an oxidizing current, control over polymer molecular weight and dispersity is demonstrated and excellent chain end fidelity allows for the synthesis of block copolymers.
Catalytic properties of polymer matrix-immobilized cobalt complexes with sulfonated phthalocyanines
Vashurin,Badaukaite,Futerman,Pukhovskaya,Shaposhnikov,Golubchikov
, p. 197 - 200 (2013)
Enhancement of the catalytic activity of phthalocyanine catalysts by their immobilizing on polymer matrices has been studied. It has been found that the immobilization of sulfonated cobalt phthalocyanines on polymers enhances their catalytic activity in the oxidation of sodium diethyldithiocarbamate with air oxygen under mild conditions.
Interaction of Diethyldithiocarbamate with n-Type Cadmium Sulfide and Cadmium Selenide: Efficient Photoelectrochemical Oxidation to the Disulfide and Flat-Band Potential of the Semiconductor as a Function of Adsorbate Concentration
Thackeray, James W.,Natan, Michael J.,Ng, Pohleng,Wrighton, Mark S.
, p. 3570 - 3577 (1986)
The behavior of sodium diethyldithiocarbamate, Na, at n-type semiconducting CdX (X = S, Se) in CH3CN/0.2 M NaClO4 has been studied.The Et2NCS2- interacts strongly with the CdX surface and shifts the flat-band potential, EFB, up to 1.0 V more negative with increasing Et2NCS2- concentration.The concentration dependence of the shift in EFB has been studied in the range 0-0.2 M, with 0.01 M Et2NCS2- being sufficient to shift EFB the maximum amount.The shift in EFB is due to excess negative charge on the CdX surface due to the presence of adsorbed dithio carbamate.The shift in EFB is assumed to be proportional to Et2NCS2- coverage.A plot of EFB with change in bulk concentration of Et2NCS2- can be modeled by using Langmuir adsorption isotherms.Adsorption data for two bis(dithiocarbamates), Na+2->2 and Na+2->2, show that maximum shifts of EFB are obtained at lower solution concentrations than for Et2NCS2-.The data show that the equilibrium constant for dithiocarbamate binding is somewhat greater (by a factor of 2) for CdS than CdSe.The value of EFB in the presence of 0.2 M Et2NCS2- measured by interfacial capacitance accords well with the electrode potential corresponding to onset of photoelectrochemical oxidation upon illumination with light of energy greater than the band gap, Eg, of the semiconductor.High current efficiency (at least 98percent) can be maintained to large extent conversion (70percent) in the photoelectrochemical oxidation of Et2NCS2- to 2 at either illuminated CdS or CdSe.Oxidation of Et2NCS2- can be effected at an electrode potential significantly more negative than of Et2NCS2-/2, showing that visible light can be used to drive the oxidation in an uphill sence.Compared to a Pt anode, the CdX (X = S, Se) photoanodes allow a voltage savings of the order of 1.0 V.The photoanodes are durable and show constant output of at least 10 mA/cm2 for greater than 48 h.
One Pot Synthesis of Dinuclear Tungsten(V) Compounds Containing 2+ (X = O, S; Y = O, S) Cores by Thermally Induced Internal Electron-Transfer Processes
Ansari, Mohammad A.,Chandrasekaran, Jayanthi,Sarkar, Sabyasachi
, p. 2265 - 2267 (1988)
New synthetic methods for the preparation of dimeric tungsten(V) complexes are described containing the core 2+ (X = O, S; Y = O, S).The synthesized complexes have been characterized by a variety of spectroscopic techniques. has been found to react with cyanide to give
