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
Stimuli responsive porous materials are being investigated for a plethora of potential applications. These materials have the ability to respond to their physical and chemical environment and thus provide an...
Using 4-(pyridin-4-yl)benzoic acid, 44pba (1) as a ligand, two new metal-coordination networks [Co(4)(44pba)(8)](n)·[(DMF)(3)·(EtOH)(0.25)·(H(2)O)(4)](n) (2) and [Ni(4)(44pba)(8)](n)·[(DMF)(3.5)·(EtOH)·(H(2)O)(1.5)](n) (3) were synthesized by solvothermal methods and structurally characterized. Compounds 2 and 3 are isostructural but differ in their solvent content. Each is a 2D-network which forms a spiral parallel to [001], giving rise to three distinct large channels, accounting for some 47% of the unit cell volume. Both 2 and 3 display water-induced phase transformations with chromotropism, which has been confirmed by TGA and XRPD analysis. Solvatochromism in 2 is also evident with crystals exhibiting a range of colours depending on the solvent included. This phenomenon has been characterized using TGA, XRPD and UV-vis spectrophotometry.
A series of five substituted benzoic acids with 10 substituted pyridines and quinolines have been crystallized so that their ΔpK a , defined as pK a base -pK a acid , varied from −1.14 to +4.16. This spans the 'uncertainty' region for the formation of salt versus co-crystals. Although most of our results confirmed that structure formation of co-crystal versus salt parts at ΔpK a ≈ 2, we report here a structure that does not follow the general rule and serves as a cautionary tale. CrystEngComm, 2014, 16, 5802-5810 This journal is † The structures were deposited at the Cambridge Crystallographic Data Centre and allocated the numbers: CCDC 963007-963012, 963014-963021. CIF files have been submitted as ESI. For crystallographic data in CIF or other electronic format see
|
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.