Multifunctional Properties of a 1D Helical Co(II) Coordination Polymer: Toward Single-Ion Magnetic Behavior and Efficient Dye Degradation

Abstract

This contribution deals with the synthesis and utilization of a new pyrazole-based unsymmetrical ligand, 3-(3-carboxyphenyl)-1 H -pyrazole-5-carboxylic acid (H 2 CPCA), for generating multifunctional materials. The reaction with the Co(II) salt in the presence of a co-ligand 2,9-dimethyl phenanthroline (dmphen) results in the formation of the helical compound {[Co 2 (dmphen) 2 (CPCA) 2 ]DMF} n ( 1 ). However, two isostructural monomeric complexes are formed {[M(HCPCA) 2 (H 2 O) 2 ], M = Co(II), ( 2 ) and Mn(II) ( 3 )} when reactions were carried out in the absence of dmphen. Compound 1 shows some highly encouraging single-ion magnetic (SIM) properties. Detailed magnetic studies unveil slow relaxation of magnetization of compound 1 , driven by the higher magnetic anisotropy of the cobalt ion, with the energy barrier of ∼9.2 K and relaxation time of 9.1 × 10 –5 s, suggesting a SIM behavior. Moreover, UV–vis and fluorescence studies confirm the selective dye degradation of compound 1 with methylene blue both in the presence and absence of H 2 O 2 , with the remarkable degradation efficiency of ∼98 and ∼82%, respectively.

An Anionic Nanotubular Metal–Organic Framework for High-Capacity Dye Adsorption and Dye Degradation in Darkness

“…The h + , e – , and some common reactive species such as •OH, 1 O 2 , and •O 2 – are usually considered as active species that contribute to dye degradation. , Thus, different ROS scavengers, including isopropanol, KI, Cr­(VI), and TEMPOL, were added into the reaction system to identify the role of each reactive species. The results revealed that only the addition of Cr­(VI) resulted in a decrease in degradation (Figure f), suggesting that e – may be attributed to the degradation of MB.…”

Zn-BTC MOF as an Adsorbent for Iodine Uptake and Organic Dye Degradation

“…Metal–organic frameworks (MOFs) have been continuously attracting much attention because of their appealing structural features as well as their potential applications in gas storage, guest molecule capture, dye degradation, sensing, heterogeneous catalysis, etc. − The topology of MOFs is mainly dependent on the assembly of metals and organic ligands. The construction of MOFs starting from a simple ligand and metal ion do not always follow a preprogrammed design procedure. − However, rational observations of reaction outcomes can give a hint to the reaction secrets that help to develop the desired product.…”

Tuning chain topologies and magnetic anisotropy in one-dimensional cobalt(ii) coordination polymers via distinct dicarboxylates

“…In comparison with 2D SIM frameworks, notably, only a small number of 1D Co( ii ) SIMs have been reported to date (Table S1†). 17,18…”