313554-52-8Relevant academic research and scientific papers
Synthesis and catalytic activities of a Zn(ii) based metallomacrocycle and a metal-organic framework towards one-pot deacetalization-Knoevenagel tandem reactions under different strategies: A comparative study
Guedes Da Silva, M. Fátima C.,Karmakar, Anirban,Pombeiro, Armando J. L.,Rúbio, Guilherme M. D. M.,Soliman, Mohamed M. A.
, p. 8075 - 8085 (2020)
Solvothermal reactions between a pyridine based amide functionalized dicarboxylic acid, 4,4′-{(pyridine-2,6-dicarbonyl)bis(azanediyl)}dibenzoic acid (H2L), and zinc(ii) nitrate in the absence and presence of a base produced the binuclear metallomacrocyclic compound [Zn2(L)2(H2O)4]·2(H2O)·6(DMF) (1) and the metallomacrocyclic based two dimensional MOF [Zn5(L)4(OH)2(H2O)4]n·8n(DMF)·4n(H2O) (2), respectively. Compound 1 bears two tetrahedral Zn(ii) centres, whereas the 2D framework 2 includes a penta-nuclear Zn(ii) cluster as a secondary building block unit, with two of the metal cations assuming a tetrahedral type geometry and the remaining three an octahedral type geometry. The topological analyses reveal that compound 1 has a 2-connected uninodal net and framework 2 has a 2, 8-connected binodal net. These compounds heterogeneously catalyse the tandem deacetalization-Knoevenagel condensation reactions carried out under conventional heating, microwave irradiation or ultrasonic irradiation. Comparative studies show that ultrasonic irradiation (final product yield of 99percent after 2 h of reaction time) provides the most favourable method (e.g., microwave irradiation leads to a final product yield of 91percent after 3 h of reaction time). Moreover, the catalysts can be reused at least for five consecutive cycles without losing activity significantly.
Cobalt complexes appended with para - And meta -arylcarboxylic acids: Influence of cation, solvent, and symmetry on hydrogen-bonded assemblies
Kumar, Girijesh,Aggarwal, Himanshu,Gupta, Rajeev
, p. 74 - 90 (2013/03/29)
The present work shows the syntheses, structures, and hydrogen-bonding- based self-assembly of Co3+ coordination complexes containing appended arylcarboxylic acid groups. The carboxylic acid groups are present at either the para or the meta position of the appended arene ring. Every Co 3+ coordination complex offers both hydrogen-bond donors (in O-H groups of arylcarboxylic acid) and acceptors (in C=Oamide groups as well as C=Oacid of arylcarboxylic acid) in a single molecule. As a consequence, all molecules self-assemble in a highly complementary and unique structural fashion via an array of inter- and intramolecular hydrogen bonding. The position of carboxylic acid, presence of cation, type of cation, and solvent of crystallization has significantly affected/altered the self-assembly process of complementary functional groups.
