Category: 105-83-9

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The reaction of 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz) with Cu(BF 4)2·3H2O and N,N-bis(3-aminopropyl)methylamine (Medpt) yielded the monomeric complex [(tptz)CuII-(Medpt)](BF4)2·2MeOH (1) whereas reaction of tptz with CuCl2·2H2O yielded the dinuclear complex [{CuIICl2}(tptz){Cu IICl2(MeOH)}] (2). The molecular structures of 1 and 2 were established by single-crystal X-ray diffraction studies. The copper ion in complex 1 is elongated octahedral with the nitrogen atoms of Medpt and the triazine nitrogen atom of tptz in the equatorial positions, and the two pyridyl nitrogen atoms of tptz in axial positions. The two CuII ions in complex 2 are bridged by tptz, coordinating to Cu1 in a terpyridine-like fashion and to Cu2 in a bipyridine-like coordination mode. The triazine nitrogen atom bound to Cu1 is coordinated in an equatorial position whereas the triazine nitrogen atom bound to Cu2 is situated in the apical position. The equatorial plane of Cu1 is coplanar with the 1,3,5-triazine plane whereas the equatorial plane of Cu2 is perpendicular to the 1,3,5-triazine plane. Intermolecular interactions in the solid state result in both compounds in “dimeric units” due to hydrogen bonding. Both complexes were investigated by variable-temperature magnetic susceptibility measurements. Through-space dipolar couplings and/or weak through-bond interactions in complex 1 result in a small intermolecular antiferromagnetic interaction (J = -0.09 cm-1). The intramolecular exchange coupling in the dinuclear complex 2 is antiferromagnetic (J = -2.5 cm-1). This antiferromagnetic interaction was analyzed in view of the molecular structure considering spin-polarization, superexchange and orbital-orthogonality. A spin-polarization pathway seems to be the leading contribution which does not involve the 1,3 bridging pathway. ( Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004).

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 105-83-9, molcular formula is C7H19N3, introducing its new discovery. Safety of N1-(3-Aminopropyl)-N1-methylpropane-1,3-diamine

The reaction of cis-3,5-dibromo-4-oxo-2,2,6,6-tetramethylpiperidin-1-oxyl (1) with polyamines provides a convenient and short way to synthesize polynitroxides spin labels in a good yield where 3-carboxy-2,2,5,5-tetramethylpyrrolin-1-oxyl (3) is a nitroxyl moiety obtained by contraction of a ring from six (1) to five (3) in a Favorskii rearrangement under nucleophilic action of primary or secondary amines.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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Polyhydroxypolyamides (PHPAs) represent a class of synthetic polyamides derived from aldaric acid and diamine monomer units. This paper describes the synthesis of some poly(galactaramides), a class of polyhydroxypolyamides, that employs alkylene and substituted alkylenediammonium galactarate salts, with 1:1 molar equivalency of the diacid and diamine monomer components, as precursors for the polyamides. The salts were treated with acid/alcohol and then base in order to initiate the polymerization in methanol. The polyamides, labeled as prepolyamides, precipitated from solution and were then subjected to a second polymerization (postpolymerization) in a different solvent to produce a generally larger polyamide, labeled as a postpolyamide.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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Metal complexes of a dipyridine octaazamacrocycle: Stability constants, structural and modelling studies

Two 28-membered octaazamacrocycles, [28]py2N6 and Me2[28]py2N6, have been synthesized. The protonation constants of the N-methyl derivative and the stability constants of its complexes with Ni2+, Cu2+, Zn2+, Cd2+, and Pb2+ were determined at 25C in 0.10 mol dm-3 KNO3. The high overall basicity of Me2[28]py2N6 is ascribed to the weaker repulsion between protonated contiguous charged ammonium sites separated by propyl chains. These studies together with NMR, UV-vis and EPR spectroscopies indicated the presence of mono- and di-nuclear species. The single crystal structure of the complex [Ni2([28]py2N6) (H2O)4]Cl4·3H2O was determined, and showed each nickel centre in a distorted octahedral co-ordination environment. The nickel centres are held within the macrocyle at a large distance of 6.991(8) A from each other. The formation of mononuclear complexes was evaluated theoretically via molecular mechanics (MM) and molecular dynamics (MD) calculations and showed that these large macrocycles have sufficient flexibility to encapsulate metal ions with different stereo-electronic sizes. Structures for small and large metal ions are proposed.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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A new family of NxOx pyridine-containing macrocycles: Synthesis and characterization of their Y(III), Ln(III), Zn(II), and Cd(II) coordination compounds

Reaction between 2,6-bis(2-formylphenoxymethyl)pyridine and N,N-bis(3-aminopropyl)methylamine or tris(2-aminoethyl)amine has been used as the starting point for the synthesis of seven oxa-aza macrocyclic ligands, five of them never reported previously. They all feature different pendant arms, which provide a wide range of coordination possibilities. The Schiff base macrocycles L1 and L4 and their reduced ligands L 2 and L5 are derived from 2,6-bis(2-formylphenoxymethyl) pyridine and tris(2-aminoethyl)amine or N,N-bis(3-aminopropyl)methylamine, respectively. The reaction of L1 with salicylaldehyde forms L 3, which features an imine bond in the pendant arm. The ligand L 5 has been the precursor for the pendant-armed L6 and L7, by alkylation of the free NH groups with methyl-imidazole or methyl-indole. By a template or a nontemplate approach, we have synthesized different mono- and dinuclear complexes with Y(III), Ln(III), Zn(II), and Cd(II) cations. Both the free macrocyclic ligands and their corresponding metal complexes have been characterized by microanalysis, IR, UV-vis, 1H and 13C NMR spectroscopy, FAB mass spectrometry, MS electrospray, and conductivity measurements.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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Synthetically accessible, high-affinity phosphate anion receptors

We report synthetically accessible receptors with protonated amines attached to a conformationally constrained backbone including amide units, and demonstrate that these receptors have high affinities (log K > 5) for phosphate anions in aqueous media at pH 7 in the presence of high concentrations of competitive chloride anions (ca. 100-fold excess). The Royal Society of Chemistry.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 105-83-9, molcular formula is C7H19N3, introducing its new discovery. name: N1-(3-Aminopropyl)-N1-methylpropane-1,3-diamine

Tandem trimer pyrrole-imidazole polyamide probes targeting 18 base pairs in human telomere sequences

The binding of molecules to specific DNA sequences is important for imaging genome DNA and for studying gene expression. Increasing the number of base pairs targeted by these molecules would provide greater specificity. N-Methylpyrrole-N-methylimidazole (Py-Im) polyamides are one type of such molecules and can bind to the minor groove of DNA in a sequence-specific manner without causing denaturation of DNA. Our recent work has demonstrated that tandem hairpin Py-Im polyamides conjugated with a fluorescent dye can be synthesized easily and can serve as new probes for studying human telomeres under mild conditions. Herein, to improve their selectivities to telomeres by targeting longer sequences, we designed and synthesized a fluorescent tandem trimer Py-Im polyamide probe, comprising three hairpins and two connecting regions (hinges). The new motif bound to 18 bp dsDNA in human telomeric repeats (TTAGGG)n, the longest sequence for specific binding reported for Py-Im polyamides. We compared the binding affinities and the abilities to discriminate mismatch, the UV-visible absorption and fluorescence spectra, and telomere staining in human cells between the tandem trimer and a previously developed tandem hairpin. We found that the tandem trimer Py-Im polyamide probe has higher ability to recognize telomeric repeats and stains telomeres in chemically fixed cells with lower background signal. This journal is

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， Product Details of 105-83-9, Which mentioned a new discovery about 105-83-9

Polyamine analogues with antitumor activity

A series of tetraamines derived from 1,8-diaminooctane was prepared and tested as antitumor agents. The reaction of 1,8-diaminooctane with acrylonitrile gave N,N’-bis(cyanoethyl)-1,8-diaminooctane, which was reduced to tetraamine 20. Alkylation of the terminal nitrogen atoms of the tetra-Boc derivative of this compound by methyl or ethyl halide followed by removal of the Boc groups gave the bis(alkyl)polyamines 26a and 26b, respectively. These three compounds exhibit promising antitumor activity in the mouse L1210 leukemia model. Coadministration of a polyamine oxidase inhibitor potentiated the antitumor activity.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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POLYAMINE POLYAMIDOAMINE EPIHALOHYDRIN COMPOSITIONS AND PROCESSES FOR PREPARING AND USING THE SAME

Compositions of and processes for preparing a polyamine-polyamidoamine-epihalohydrin resin generally include reacting a first polyamine, a polyamidoamine, and an epihalohydrin to form the polyamine-polyamidoamine-epihalohydrin (PPAE) resin, wherein the polyamidoamine is prepared by reacting a polycarboxylic acid or a polycarboxylic acid derivative with a second polyamine to form the polyamidoamine, wherein a molar ratio of the polyamine to the polycarboxylic acid is 1.05 to 2.0. The PPAE resin can be used in an adhesive formulation for use in creping applications for forming paper products such as tissue products.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Related Products of 105-83-9, Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. 105-83-9, Name is N1-(3-Aminopropyl)-N1-methylpropane-1,3-diamine,introducing its new discovery.

Mechanistic Studies on Cyclopalladation of the Solvated Palladium (II) Complexes with N-Benzyl Triamine Ligands in Various Solvents. Crystal Structures of [Pd(Sol)(Bn2Medptn)](BF4)2 (Sol = Acetonitrile and N, N-Dimethylformamide; Bn2Medptn = N, N?-Dibenzyl-4-methyl-4-azaheptane-1,7-diamine) and [Pd(H-1Bn2Medptn-C, N

Several solvated palladium(II) complexes with the potentially cyclopulladating dibenzyl ligand have been synthesized. These include [Pd(CH3CN)(Bn2Medptn)](BF4)2 (1) (Bn2Medptn = N, N’-dibenzyl-4-methyl-4-azaheptane-1,7-diamine), [Pd(dmf)(Bn2Medptn)](BF4)2 (2) (dmf = N, N-dimethylformamide), and [Pd(dmso)(Bn2Medptn)](BF4)2 (3) (dmso = dimethyl sulfoxide), their cyclopalladated complex, [Pd(H-1Bn2Medptn-C, N, N’, N”)]CF3SO3 (4), the solvated monobenzyl complex, [Pd(CH3CN)(BnMedptn)](BF4)2 (5) (BnMedptn = N-(3-aminopropyl)-N’-benzyl-N-methyl-1,3-propanediamine), and its deuterated complex, [Pd(CH3CN)(BnMedptn-d7)](BF4)2 (6) (BnMedptn-d7 = N-(3-aminopropyl)-N’-heptadeuteriobenzyl-N-methyl-1,3-propanediamine). The crystal structures of 1·CH3CN·CH2Cl2, 2, and 4 have been determined by X-ray structure analysis to characterize the reactant and the product for the cyclopalladation of the solvated complexes, where one of the ortho carbons of 1 is directed toward the palladium(II) center (Pd···C(1) = 3.513(9) A). The rate constants for the cyclopalladation of 1 at 25C in various solvents increase in the order DMF < DMSO?pyridine, but the reaction does not proceed in acetonitrile or nitromethane. The activation parameters for the cyclopalladation in neat solvent have been obtained as follows: k298 = 5.74 × 10-6, DeltaH? = 104.0±1.2kJmol-1 and DeltaS? = 3.5±3.9 JK-1 mol-1 for 1 in DMF, k298 = 3.13 × 10-4 s-1, DeltaH? = 83.8±2.6 kJ mol-1 and DeltaS? = -31.0±8.8 JK-1 mol-1 for 1 in DMSO, k298 = 1.30×10-4 s-1, DeltaH? = 81.2±0.5 kJ mol-1 and DeltaS? = -47.0±1.8 J K-1 mol-1 for 5 in DMF, k298 = 1.76×10-3 s-1 for 5 in DMSO, k298 = 1.26×10-5 s-1, DeltaH? = 92.8±1.4 kJ mol-1 and DeltaS? = -27.5±4.4 J K-1 mol-1 for 6 in DMF and k298 = 2.69×10-4 s-1 for 6 in DMSO. The activation enthalpy is reduced as the solvent basicity increases. The kinetic isotope effects (kH/kD) for the cyclopalladation of the monobenzyl complex at 25C are calculated to be 10.3 in DMF and 6.5 in DMSO using the rate constants for 5 and 6. It is confirmed from the kinetic results obtained that the nucleophilic attack of the basic solvent on the ortho proton is essential for the C-H bond cleavage observed in the activation process. In addition, the fact that the rate constant for the cyclopalladation is proportionally dependent on the concentration of DMSO in nitromethane strongly suggests that the solvent-dissociation pre-equilibrium is negligible in neat basic solvent. If you’re interested in learning more about 41979-39-9, below is a message from the blog Manager. Related Products of 105-83-9

Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI