Effect of structural variability and flexibility of aliphatic diamines on self-assembly of host-guest coordination polymers constructed of copper cyanide networks: Structure study and catalytic activity

A new 3D-host-guest supramolecular coordination polymer (SCP); ∞3[(Cu3(CN)3)2.(DAHP)], 1 [1,7-diaminoheptane=.(DAHP)] had been synthesized by self-assembly at ambient conditions. X-ray single crystal diffraction of SCP 1 indicated the formation of two-fold [Cu3(CN)3]2 units containing tetrahedral copper(I) atoms which are arranged in unique way to create 3D-network. The neutral [Cu3(CN)3]2 building blocks create unique complex structure containing the minicycle [Cu2(μ3-CN)2] motif with wide cavities enable to capsulate the long chain DAHP as guest molecule. The topology of 1 had been studied by elemental analysis, IR-spectra and thermogravimetric analyses. The topology of 1 had been compared with the prototype SCP containing different aliphatic diamines which indicated the effect of structural variability and flexibility of aliphatic diamines on the network structure of these SCP. The catalytic and photo-catalytic activity of 1 was studied for mineralization of methylene blue (MB) utilizing H2O2 as an oxidant.

SYNTHETIC POLYAMPHOLYTE HYDROGELS BASED ON VARIOUS ALIPHATIC DIAMINS FOR REMOVING DYES FROM AQUEOUS SOLUTIONS

Были исследованы полиамфолитные гидрогели, полученные на основе частично гидролизованного полиакриламида и алифатических диаминов (этилендиамина, 1,3-диаминопропана и 1,4-диаминобутана) без использования инициирующей системы и сшивающего агента. Использованные азотсодержащие мономеры, обладая высокой химической активностью, осуществляют химическую сшивку получаемых полиамфолитных гидрогелей. Было установлено, что полиамфолиты, полученные из сильного основания и слабой кислоты, теряют свою чувствительность к рН и ионной силе из-за несбалансированности заряженных функциональных групп, что расширяет области применения полиамфолитных гидрогелей в различных областях промышленности, где в течение процесса значения рН и содержание электролитов могут меняться. Полученные полиамфолитные гидрогели на основе различных алифатических диаминов могут быть использованы в качестве сорбционных материалов для удаления окрашенных примесей и могут применяться в широком диапазоне значений рН. Polyampholytic hydrogels based on partially hydrolyzed polyacrylamide and aliphatic diamines (ethylenediamine, 1,3-diaminopropane, and 1,4-diaminobutane) without using an initiator system and a crosslinking agent was studied. The used nitrogen-containing monomers, possessing high chemical activity, carry out chemical crosslinking of the obtained polyampholytic hydrogels. It was found that polyampholytes obtained from a strong base and a weak acid lose their sensitivity to pH and ionic strength due to the imbalance of charged functional groups, which expands the scope of application of polyampholyte hydrogels in various industries, where during the process the pH values and electrolyte content can change. The obtained polyampholytic hydrogels based on various aliphatic diamines can be used as sorption materials to remove colored impurities and can be used in a wide range of pH values.

Novel Convenient Approach to the Solid-Phase Synthesis of Oligonucleotide Conjugates

A novel and convenient approach for the solid-phase 5′-functionalization of oligonucleotides is proposed in this article. The approach is based on the activation of free 5′-hydroxyl of polymer support-bound protected oligonucleotides by N,N′-disuccinimidyl carbonate followed by interaction with amino-containing ligands. Novel amino-containing derivatives of closo-dodecaborate, estrone, cholesterol, and α-tocopherol were specially prepared. A wide range of oligonucleotide conjugates bearing closo-dodecaborate, short peptide, pyrene, lipophilic residues (cholesterol, α-tocopherol, folate, estrone), aliphatic diamines, and propargylamine were synthesized and characterized to demonstrate the versatility of the approach. The developed method is suitable for the conjugate synthesis of oligonucleotides of different types (ribo-, deoxyribo-, 2′-O-methylribo-, and others).