Concomitant Metal Organic Frameworks of Cobalt(II) and 3-(4-Pyridyl)benzoate: Optimized Synthetic Conditions of Solvatochromic and Thermochromic Systems

Abstract

Two coordination networks: {[Co(34pba) 2 ]•DMF} n (1 and 2), where 34pba is 3-(4-pyridyl)benzoate, were prepared by solvothermal methods. 1 is a 3D metal organic framework formed by linking [Co 2 (34pba) 8 ] clusters in a bcu net. 2 consists of single [Co(34pba) 4 ] units in a tetragonal plane net of sql topology. The thermal conditions leading to their selective synthesis were established: 120°C for 1 and 75°C for 2. Their structures were solved and their thermal

Direct visualization of a guest-triggered crystal deformation based on a flexible ultramicroporous framework

“…We selected 3-(pyridin-4-yl)benzoic acid (Hpba) as a short and flexible ligand for generation of small pores [31][32][33][34] . In a few examples, the biphenyllike fragments of organic ligands have been observed to undergo paddlewheel movement or conformation change 35,36 .…”

Recent advances in metal–organic frameworks based on pyridylbenzoate ligands: properties and applications

“…12 Hydrothermal synthesis has also been used to assemble MOFs of 34pba and 44pba. This technique gives rise to the formation of highly porous MOFs.…”

“…Bourne and co-workers fabricated two molecular building blocks structural isomers with the same elemental composition having a molecular formula [Co(34pba)2•DMF}n. 12 . The large crystal in Figure 12 has an 8-connected bcu net while the small crystal has an sql net.…”

“…A search in the Cambridge structural database shows that there are over 5600 (2015 update) compounds assembled from 4,4'bipyridine linkers. 8,12 Asymmetrical ligands have gained considerable attention because they are prototypes for supramolecular self-assembly processes including metal-organic helices. Carboxylate groups are expected to form strong coordination bonds with metal ions while the nitrogen to metal bonds is generally weak.…”

“…Carboxylate groups are expected to form strong coordination bonds with metal ions while the nitrogen to metal bonds is generally weak. [4][5][6][7][8][9][10][11][12][13][14][15] One limitation of using long linkers such as 44pba in the self-assembly of MOFs is the formation of interpenetrated networks which reduces the porosity of the material. 8,12 Asymmetrical ligands have gained considerable attention because they are prototypes for supramolecular self-assembly processes including metal-organic helices.…”