Mixed Ligand Coordination Polymers for Metallogelation and Iodine Adsorption

A bis-pyridyl-bis-amide derivative of diphenylmethane (L1) and terephthalate (TA) was combined with a number of metal salts [Cu­(II), Zn­(II), Ni­(II), Co­(II), and Cd­(II)] in a 1:1:1 molar ratio to generate a series of coordination polymers (CP1A–CP5) which were thoroughly characterized by single crystal X-ray diffraction. All the CPs turned out to be lattice occluded crystalline solids having 4 × 4 grid framework structures. Under suitable conditions, the reactants of the corresponding CPs produced metallogels as envisaged considering a crystal engineering based structural rationale. One of the CPs, namely, CP5, demonstrated the ability to adsorb molecular iodine both in vapor and solution phase. Iodine adsorption was also found to be reversible as evident from its release in ethanol from both CP5@I2 (vapor) and CP5@I2 (solution). In situ synthesis of silver nanoparticles was also achieved in the gel matrix of L1 without the help of any exogenous reducing agent

Secondary Ammonium Dicarboxylate (SAD)A Supramolecular Synthon in Designing Low Molecular Weight Gelators Derived from Azo-Dicarboxylates

The supramolecular synthon namely secondary ammonium dicarboxylate (SAD) synthon has been exploited to design a new series of low molecular weight gelators (LMWGs) derived from azobenzene-4,4′-dicarboxylic acid and azobenzene-4,4′-diacrylic acid, and various secondary amines. Single crystal structures of six such salts exclusively established the presence of SAD synthon. Two such salts namely, dicyclohexylammonium azobenzene-4,4′-diacrylate (2.DCHA) and dihexylammonium azobenzene-4,4′-diacrylate (2.DHA) displayed intriguing gelation properties. Powder X-ray diffraction in combination with single crystal X-ray data established existence of SAD synthon in the structure of the gel network of 2.DCHA. UV-irradiation of the salts as well as the gel did not show any trans–cis isomerization of the azo-moiety

Correction to “Supramolecular Hydrogel Derived from a C₃‑Symmetric Boronic Acid Derivative for Stimuli Responsive Release of Insulin and Doxorubicin”

Correction to “Supramolecular Hydrogel Derived from a C₃‑Symmetric Boronic Acid Derivative for Stimuli Responsive Release of Insulin and Doxorubicin

Cation-Induced Supramolecular Isomerism in the Hydrogen-Bonded Network of Secondary Ammonium Monocarboxylate Salts: A New Class of Organo Gelator and Their Structures

A series of secondary ammonium monocarboxylate salts have been prepared by reacting variously substituted cinnamic acids and benzoic acids with dibenzylamine. Gelation tests reveal that 19 salts (9 cinnamates and 10 benzoates) are moderate to good gelators of various organic fluids, including commercial fuels such as gasoline and diesel fuel. Structure−property correlation studies based on single-crystal structures of 18 salts indicate that the one-dimensional hydrogen-bonded network is indeed important for gelation. The conformational flexibility of the dibenzyl cation and various intra- and internetwork C−H···π and C−H···O interactions appear to be responsible for the stabilization of the one-dimensional network in these salts. The gel fibrils in the xerogel state for 8 salts also adopt a 1D hydrogen-bonded network, as revealed by detailed X-ray powder diffraction studies, further supporting the importance of the one-dimensional network in the gelation process

Cation-Induced Supramolecular Isomerism in the Hydrogen-Bonded Network of Secondary Ammonium Monocarboxylate Salts: A New Class of Organo Gelator and Their Structures

A series of secondary ammonium monocarboxylate salts have been prepared by reacting variously substituted cinnamic acids and benzoic acids with dibenzylamine. Gelation tests reveal that 19 salts (9 cinnamates and 10 benzoates) are moderate to good gelators of various organic fluids, including commercial fuels such as gasoline and diesel fuel. Structure−property correlation studies based on single-crystal structures of 18 salts indicate that the one-dimensional hydrogen-bonded network is indeed important for gelation. The conformational flexibility of the dibenzyl cation and various intra- and internetwork C−H···π and C−H···O interactions appear to be responsible for the stabilization of the one-dimensional network in these salts. The gel fibrils in the xerogel state for 8 salts also adopt a 1D hydrogen-bonded network, as revealed by detailed X-ray powder diffraction studies, further supporting the importance of the one-dimensional network in the gelation process

Secondary Ammonium Dicarboxylate (SAD)A Supramolecular Synthon in Designing Low Molecular Weight Gelators Derived from Azo-Dicarboxylates

The supramolecular synthon namely secondary ammonium dicarboxylate (SAD) synthon has been exploited to design a new series of low molecular weight gelators (LMWGs) derived from azobenzene-4,4′-dicarboxylic acid and azobenzene-4,4′-diacrylic acid, and various secondary amines. Single crystal structures of six such salts exclusively established the presence of SAD synthon. Two such salts namely, dicyclohexylammonium azobenzene-4,4′-diacrylate (<b>2.DCHA</b>) and dihexylammonium azobenzene-4,4′-diacrylate (<b>2.DHA</b>) displayed intriguing gelation properties. Powder X-ray diffraction in combination with single crystal X-ray data established existence of SAD synthon in the structure of the gel network of <b>2.DCHA</b>. UV-irradiation of the salts as well as the gel did not show any trans<i>–</i>cis isomerization of the azo-moiety

Supramolecular Hydrogen Bond Isomerism in Organic Salts: A Transition from 0D to 1D

Based on nine single-crystal structures of a series of organic salts derived from dicyclohexylamine and n-alkyl monocarboxylic acids (CH3−(CH2)n−COOH, n = 1−17), it is shown that salts having n = 14 and 15 display 1D hydrogen-bonded networks, whereas majority of the salts having n = 1−9 show 0D networks. Structural analyses indicate that both intra- and internetwork alkyl−alkyl interactions appear to be responsible for such a supramolecular transition

Cation-Induced Supramolecular Isomerism in the Hydrogen-Bonded Network of Secondary Ammonium Monocarboxylate Salts: A New Class of Organo Gelator and Their Structures

A series of secondary ammonium monocarboxylate salts have been prepared by reacting variously substituted cinnamic acids and benzoic acids with dibenzylamine. Gelation tests reveal that 19 salts (9 cinnamates and 10 benzoates) are moderate to good gelators of various organic fluids, including commercial fuels such as gasoline and diesel fuel. Structure−property correlation studies based on single-crystal structures of 18 salts indicate that the one-dimensional hydrogen-bonded network is indeed important for gelation. The conformational flexibility of the dibenzyl cation and various intra- and internetwork C−H···π and C−H···O interactions appear to be responsible for the stabilization of the one-dimensional network in these salts. The gel fibrils in the xerogel state for 8 salts also adopt a 1D hydrogen-bonded network, as revealed by detailed X-ray powder diffraction studies, further supporting the importance of the one-dimensional network in the gelation process

Cation-Induced Supramolecular Isomerism in the Hydrogen-Bonded Network of Secondary Ammonium Monocarboxylate Salts: A New Class of Organo Gelator and Their Structures

A series of secondary ammonium monocarboxylate salts have been prepared by reacting variously substituted cinnamic acids and benzoic acids with dibenzylamine. Gelation tests reveal that 19 salts (9 cinnamates and 10 benzoates) are moderate to good gelators of various organic fluids, including commercial fuels such as gasoline and diesel fuel. Structure−property correlation studies based on single-crystal structures of 18 salts indicate that the one-dimensional hydrogen-bonded network is indeed important for gelation. The conformational flexibility of the dibenzyl cation and various intra- and internetwork C−H···π and C−H···O interactions appear to be responsible for the stabilization of the one-dimensional network in these salts. The gel fibrils in the xerogel state for 8 salts also adopt a 1D hydrogen-bonded network, as revealed by detailed X-ray powder diffraction studies, further supporting the importance of the one-dimensional network in the gelation process

Cation-Induced Supramolecular Isomerism in the Hydrogen-Bonded Network of Secondary Ammonium Monocarboxylate Salts: A New Class of Organo Gelator and Their Structures

A series of secondary ammonium monocarboxylate salts have been prepared by reacting variously substituted cinnamic acids and benzoic acids with dibenzylamine. Gelation tests reveal that 19 salts (9 cinnamates and 10 benzoates) are moderate to good gelators of various organic fluids, including commercial fuels such as gasoline and diesel fuel. Structure−property correlation studies based on single-crystal structures of 18 salts indicate that the one-dimensional hydrogen-bonded network is indeed important for gelation. The conformational flexibility of the dibenzyl cation and various intra- and internetwork C−H···π and C−H···O interactions appear to be responsible for the stabilization of the one-dimensional network in these salts. The gel fibrils in the xerogel state for 8 salts also adopt a 1D hydrogen-bonded network, as revealed by detailed X-ray powder diffraction studies, further supporting the importance of the one-dimensional network in the gelation process