Co^II/Zn^II–(L‐Tyrosine) Magnetic Metal–Organic Frameworks

Abstract

Three chiral coordination polymers assembled from L‐tyrosine (L‐tyr) and cobalt, cobalt/zinc and zinc salts, with a new three‐dimensional (3D) structure and formulated as [M(L‐tyr)]n (M = Co, Co/Zn, Zn) have been prepared by mild hydrothermal synthesis. These three compounds are isostructural, crystallize with monoclinic symmetry in the C2 space group and possess four crystallographically unique metal sites in tetrahedral (two) and octahedral (two) coordination environments resulting in two slightly distinct edge‐sharing metal dimers with L‐tyr linking the metal atoms in pillars. These features result in a dense framework. The study of the magnetic properties of the cobalt‐bearing solid reveals a ferromagnetic exchange interaction within the Co2+ dimers. The racemic compound of dl‐tyrosine and cobalt was also synthesized and its structure characterized.

Homochiral metal‐organic frameworks based on amino acid ligands for HPLC separation of enantiomers

“…[Zn(L‐tyr)] n (L‐tyrZn) was synthesized according to Zhou et al. . Typically, Zn(CH 3 COO) 2 ·2H 2 O (0.219 g, 1 mmol) and L‐tyrosine (0.362 g, 2 mmol) were mixed with 20 mL of ultrapure water.…”

α−Fe2O3 Nanoparticles/Porous g−C3N4 Hybrids Synthesized by Calcinations of Fe‐based MOF/Melamine Mixtures for Boosting Visible‐Light Photocatalytic Tetracycline Degradation

“…33-0664), indicating that the MIL-101 (Fe) has been oxidized to αÀ Fe 2 O 3 with high purity during calcination process. [18] The uppermost line displays two typical peaks at 12.9°and 27.6°related to (100) and (002) lattice planes of gÀ C 3 N 4 , [27] meaning that the calcination product of melamine is gÀ C 3 N 4 . In the middle lines, the typical diffraction peaks of αÀ Fe 2 O 3 can be found and meanwhile the feature peak representing (002) lattice planes of gÀ C 3 N 4 gradually strengthens from the bottom to the top, directly confirming that Fe 2 O 3 / gÀ C 3 N 4 hybrids were successfully synthesized by calcinations of MIL-101 (Fe)-melamine mixtures.…”

“…[10] Nevertheless, the short lifetime of photogenerated charge carriers and small hole diffusion length greatly hinder the widespread application of αÀ Fe 2 O 3 in photocatalysis. [11] In the past several years, the coupling of gÀ C 3 N 4 with αÀ Fe 2 O 3 has been an effective route to enhance themselves' visible-light photocatalytic activity in various fields such as pollutant degradation, [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] hydrogen production, [32][33][34][35][36][37][38][39] CO 2 reduction, [40,41] organic synthesis, [42,43] and nitrogen fixation. [44,45] Due to the appropriate band positions of αÀ Fe 2 O 3 and gÀ C 3 N 4 , the strong interfacial coupling of αÀ Fe 2 O 3 /gÀ C 3 N 4 hybrids largely promoted the transfer and separation of photoinduced charge carriers by common or even Z-scheme modes, directly accounting for their high photocatalytic efficiency.…”

Nanoflakes of an aminoacid-based chiral coordination polymer: Synthesis, optical and electrochemical properties, and application in electrochemical sensing of H2O2

“…The solubility of tyr is not high at low pH ($ 3), so, much tyr remained unreacted. Increasing pH value can promote the dissolution of tyr and improve its coordination ability [10][11][12]. However, too high pH ($ 6) may result in unexpected products, such as Cu(OH) 2 and CuO.…”