Kinetics of proton transfer from tetra(4-nitro-5-tert-butyl)phthalocyanine to nitrogen-containing bases in benzene

The acid-basic interaction between tetra(4-nitro-5-tert-butyl)phthalocyanine and pyridine, 2-methylpyridine, morpholine, piperidine, n-butylamine, diethylamine, and triethylamine in benzene is studied. It is found that the intermolecular transfer of protons of NH groups from tetra(4-nitro-5-tert-butyl)phthalocyanine to morpholine and diethylamine is characterized by unusually low values of the reaction constant rates. The effect of the structure of tetra(4-nitro-5-tert-butyl)phthalocyanine and tetra(3-nitro-5-tert-butyl)phthalocyanine, and of the nature of the base on the kinetic parameters of acid-base interaction is demonstrated. A structure is proposed for complexes with the transfer of displaced phthalocyanines’ protons. It is found that they undergo decomposition over time.     

Kinetic characteristics of intermolecular proton transfer from NH groups of tetra(3-nitro-5-tert-butyl)phthalocyanine in nitrogen base-benzene systems

The kinetics of acid-base interaction between tetra(3-nitro-5-tert-butyl)phthalocyanine and cyclic and acyclic nitrogen bases in benzene was studied. The reaction was found to occur with a low rate. The structure and reactivity of protolytes were shown to be interrelated. The structure and stability of the proton-transfer complexes formed are considered.     

Kinetic stability of tetra(3-nitro-5-<Emphasis Type="Italic">tert</Emphasis>-butyl)phthalocyanine in the system nitrogen-containing base-DMSO

The state of tetra(3-nitro-5-tert-butyl)phthalocyanine in DMSO medium was studied. Sufficiently high stability of the obtained proton transfer complex is established, and its structure is suggested. It is shown that this complex is kinetically unstable in the highly basic media. Effect of the nature of cyclic and acyclic nitrogen-containing bases on the rate and activation parameters of destruction of the proton transfer complex of tetra(3-nitro-5-tert-butyl)phthalocyanine was found     

Kinetics of acid-base interaction of octaphenyl-substituted tetraazaporphyrins with nitrogen-containing bases in a system benzene-dimethylsulfoxide

Effect of dimethylsulfoxide additives on the kinetics of acid-base interaction of octaphenyl-substituted tetraazaporphyrins with nitrogen-containing bases in benzene is studied. A strong effect of the solvent on the process rate and activation parameters is revealed. The relation of the molecular structure of the interacting molecules to their reactivity is demonstrated.

     

Creatinine sorbents based on nonwoven polymeric materials modified with tetra(4-tert-butyl)phthalocyanine and zinc complex

The experimental results, which show the possibility of immobilization of tetra(4-tert-butyl)phthalocyanine complex and its zinc complex on the surface of nonwoven polypropylene and lavsan materials. The alkali etching method was used for activation of the polypropylene surface. It was shown that the modified polymeric materials possess sorption activity relative to creatinine.     

Mechanism of the quenching of O2(1Δ g ) by erbium tetra(4-tert-butyl)phthalocyanine

The quenching of singlet molecular oxygen (¹O₂, ¹Δ _g ) by Er³⁺ tetra(4-tert-butyl)phthalocyanine in benzene was studied by the luminescence method. The quenching was demonstrated to be controlled by a physical-chemical mixed mechanism, with donor-acceptor interactions being the main contributor to the physical quenching of ¹O₂.     

Kinetic stability of tetra(1,2,5-thiadiazolo)porphyrazine in the system nitrogen-containing base-dimethyl sulfoxide

The behavior of tetra(1,2,5-thiadiazolo)porphyrazine in dimethyl sulfoxide has been studied, and fairly high stability of the resulting proton-transfer complex has been revealed. The complex is kinetically unstable in strongly basic media. The effects of the nitrogen-containing base and NH acidity of the porphyrazine macrocycle on the rate and activation parameters of decomposition of the proton-transfer complex have been estimated.     

Kinetics of proton transfer from hexa(m-trifluoromethylphenyl)benzotetraazaporphine to nitrogen-containing bases in benzene

Acid-base interactions of hexa(m-trifluoromethylphenyl)benzotetraazaporphine with pyridine, 2-methylpyridine, morpholine, benzylamine, piperidine, n-butylamine, diethylamine, triethylamine, and tert-butylamine in benzene are studied. It is found that intermolecular proton transfer from the NH groups of hexa(m-trifluoromethylphenyl)benzotetraazaporphine to n-butylamine and piperidine is characterized by unusually low values of rate constants. The effect of the structure of hexa(m-trifluoromethylphenyl)benzotetraazaporphine and octa(m-trifluoromethylphenyl)tetraazaporphine, and the nature of the base on the kinetic parameters of acid-base interactions, is demonstrated. A structure for proton-transfer complexes of substituted tetraazaporphines is proposed. It is found that they decompose over time.     

Synthesis and antimicrobial screening of tetra Schiff bases of 1,2,4,5-tetra (5-amino-1,3,4-thiadiazole-2-yl)benzene

In the present study, novel tetra Schiff bases were synthesized by condensation of 1,2,4,5-tetra (5-amino-1,3,4-thiadiazole-2-yl)benzene with different aromatic aldehydes. The chemical structures were confirmed by means of IR, ¹H NMR, ¹³C NMR, and elemental analysis. All compounds were screened for antibacterial (Staphylococcus aureus ATCC-9144, Staphylococcus epidermidis ATCC-155, Micrococcus luteus ATCC-4698, Bacillus cereus ATCC-11778, Escherichia coli ATCC-25922, and Pseudomonas aeruginosa ATCC-2853) and antifungal (Aspergillus niger ATCC-9029 and Aspergillus fumigatus ATCC-46645) activities by paper disc diffusion technique. The minimum inhibitory concentrations (MICs) of the compounds were also determined by agar streak dilution method. Among the synthesized compounds 1,2,4,5-tetra[5-(4-nitrobenzylideneamino)-1,3,4-thiadiazole-2-yl]benzene 7 was found to be the most potent antimicrobial activity with MICs of 3.4, 2.1, 1.2, 2.0, 3.1, 2.4, 1.1, and 1.7 μg/mL against the above mentioned respective strains.     

The reaction of tetra(allyl)uranium with Lewis bases

The reaction of the thermally unstable U(π-C₃H₅)₄ with an excess of 2,2′-bipyridine leads to incorporation of three 2,2′-bipyridine ligands in the thermally more stable product in which transfer of two of the four allyl groups to one or two of the 2,2′-bipyridine ligands has occurred. The product has been characterized analytically, spectroscopically, magnetically, and by detailed studies of hydrolysis products.     

Complexes of zinc 5,15-di(ortho-methoxyphenyl)octaalkylporphyrinate with nitrogen-containing bases

The formation of molecular complexes of zinc 5,15-di(ortho-methoxyphenyl)-2,8,12,18-tetramethyl-3,7,13,17-tetrabutylporphyrinate (ZnP) with nitrogen-containing bases L (L is imidazole, 2-methylimidazole, pyridine, 3,5-dimethylpyrazole, or dimethylformamide) in benzene is studied by spectrophotometry and computer simulation. The nature of an additional molecular ligand affects the stability of the macrocyclic complex (L)ZnP. The stability constant of this complex increases linearly with an increase in the basicity of the extra ligand and is proportional to the shift of the main absorption bands in the electronic spectra (Q(0–1), B (Soret band)). The molecular structures of zinc porphyrinate and its extra complexes are optimized by the PM3 quantum-chemical method. Their geometric and energy parameters are calculated. Correlations between the calculated energies of interaction of the central metal atom with the nitrogen atom of the extra ligand and the stability of (L)ZnP are found. The dependence of the zinc-extra ligand bond strength on the basicity of the additional molecular ligand is determined on the basis of the experimental and calculated data. The coordination properties of the compound under study are found to be affected by steric strains.     

四(4-三甲胺苯)卟啉与其抗体相互作用的紫外可见和圆二色谱研究

四(4-三甲胺苯)卟啉与单抗体3B6结合后，有显的增色效应，反映了卟啉与抗体是刚性紧密结合的，抗体的抗原结合部位有芳香族氨基酸存在，并且产生巨大的诱导效应．用紫外(UV)可见和圆二色谱(CD)分析四(4-三甲胺苯)卟啉同抗体的结合，表明(四(4-三甲胺苯)卟啉与单抗体，既有1：1结合又有2：1结合．     

Reactions of (Hydroxo)aluminium(III)tetra(4-chloro)phthalocyanine in Sulfuric Acid

Spectrophotometric and quantum-chemical data showed that (hydroxo)aluminium(III)tetra(4-chloro)phthalocyanine forms one protonated form (trans-dication) in aqueous concentrated H₂SO₄. The kinetics of the protonated complex dissociation across the Al–N bonds is studied. The effect of the halogen substitution in the aluminium phthalocyanine macrocycle on its basicity and stability is discussed.     

Methylation of 4-nitro-3(5)-pyrazolecarboxylic acid

Reactions of 4-nitro-3(5)-pyrazolecarboxylic acid dipotassium salt with different methylating agents in various solvents have been investigated to improve the synthesis of isomeric 1-methyl-4-nitro-3- and -5-pyrazolecarboxylic acids.     

The reaction of tetrahydridododecacarbonyltetrarhenium(0) with pyridine and some nitrogen-containing bases

The reactions of H₄Re₄(CO)₁₂ with some nitrogen-containing bases L in chloroform at room temperature were investigated. For L = pyridine, γ-picoline and piperidine, two types of products, namely [H₄Re₃(CO)₉L]⁻[LH]⁺ and H₃Re₃(CO)₉L₃, were isolated. When L = -picoline, 4-CN-pyridine, imidazole or 2,4-dimethylimidazole, [H₄Re₃(CO)₉L]⁻[LH]⁺ is the only product with a yield close to 75%. The structure of H₃Re₃(CO)₉L₃ (L = pyridine) (1) and [H₄Re₃(CO)₉L]⁻[LH]⁺ (L = -picoline) (3) were determined by the X-ray diffraction method. For 1, the three rhenium atoms form an equilateral triangle with edge-bridging hydrides. Each rhenium is coordinated by three carbonyl groups and an axial pyridine. The three pyridines are not all on the same side of the triangular plane to reduce the steric repulsion which is obvious from bond angles and distances data. In 3, the three rhenium atoms form an isosceles with two hydride-bridged Re---Re single bonds and an Re---Re double bond bridged by two hydrides. Each rhenium is coordinated by three CO groups, and -picoline is coordinated to rhenium in the axial position.     

2-Methyl-3-nitro-4-methoxymethyl-5-cyanpyridon (NCP) und 2-Methyl-3-nitro-4-methoxymethyl-5-cyan-6-chlorpyridin (CHP)

Ohne Zusammenfassung     

Extraction of Zn(II) and Cd(II) with diphenylcarbazone in presence of nitrogen-containing organic bases

The extraction of Zn(II) and Cd(II) with diphenylcarbazone in benzene in the presence of nitrogen-containing organic bases has been studied. The effect of various variables such as pH, and concentration of diphenylcarbazone and of base on the extraction has been investigated. The extracting species are [Zn(HD)₂·B·H₂O] and [Cd(HD)₂·2B]. The relative effectiveness of the bases as synergists is in the order β-picoline > pyridine > quinoline. The extraction constants for Cd(II) are higher than those of Zn(II).