Presynthesized and In-Situ Generated Tetrazolate Ligand in the Design of Chiral Cadmium Coordination Polymer

In contrast to the in-situ generated 5-(4-pyridyl)­tetrazolate (4-ptz) ligand, the use of presynthesized 4-ptz led to the formation of a chiral cadmium coordination polymer with a rare μ₅-bridging mode of the tetrazolate ligand. This type of tuning in the design of chiral coordination polymers is reported for the first time

Presynthesized and In-Situ Generated Tetrazolate Ligand in the Design of Chiral Cadmium Coordination Polymer

In contrast to the in-situ generated 5-(4-pyridyl)­tetrazolate (4-ptz) ligand, the use of presynthesized 4-ptz led to the formation of a chiral cadmium coordination polymer with a rare μ₅-bridging mode of the tetrazolate ligand. This type of tuning in the design of chiral coordination polymers is reported for the first time

Cooperative Effect of Unsheltered Amide Groups on CO₂ Adsorption Inside Open-Ended Channels of a Zinc(II)–Organic Framework

A unique spatial arrangement of amide groups for CO₂ adsorption is found in the open-ended channels of a zinc­(II)–organic framework {[Zn₄(BDC)₄(BPDA)₄]·5DMF·3H₂O}_<i>n</i> (<b>1</b>, BDC = 1,4-benzyl dicarboxylate, BPDA = <i>N,N′</i>-bis­(4-pyridinyl)-1,4-benzenedicarboxamide). Compound <b>1</b> consists of 4⁴-<b>sql</b> [Zn₄(BDC)₄] sheets that are further pillared by a long linker of BPDA and forms a 3D porous framework with an α-Po 4¹²·6³ topology. Remarkably, the unsheltered amide groups in <b>1</b> provide a positive cooperative effect on the adsorption of CO₂ molecules, as shown by the significant increase in the CO₂ adsorption enthalpy with increasing CO₂ uptake. At ambient condition, a 1:1 ratio of active amide sites to CO₂ molecules was observed. In addition, compound <b>1</b> favors capture of CO₂ over N₂. DFT calculations provided rationale for the intriguing 1:1 ratio of amide sorption sites to CO₂ molecules and revealed that the nanochamber of compound <b>1</b> permits the slipped-parallel arrangement of CO₂ molecules, an arrangement found in crystal and gas-phase CO₂ dimer

Cooperative Effect of Unsheltered Amide Groups on CO₂ Adsorption Inside Open-Ended Channels of a Zinc(II)–Organic Framework

A unique spatial arrangement of amide groups for CO₂ adsorption is found in the open-ended channels of a zinc­(II)–organic framework {[Zn₄(BDC)₄(BPDA)₄]·5DMF·3H₂O}_<i>n</i> (<b>1</b>, BDC = 1,4-benzyl dicarboxylate, BPDA = <i>N,N′</i>-bis­(4-pyridinyl)-1,4-benzenedicarboxamide). Compound <b>1</b> consists of 4⁴-<b>sql</b> [Zn₄(BDC)₄] sheets that are further pillared by a long linker of BPDA and forms a 3D porous framework with an α-Po 4¹²·6³ topology. Remarkably, the unsheltered amide groups in <b>1</b> provide a positive cooperative effect on the adsorption of CO₂ molecules, as shown by the significant increase in the CO₂ adsorption enthalpy with increasing CO₂ uptake. At ambient condition, a 1:1 ratio of active amide sites to CO₂ molecules was observed. In addition, compound <b>1</b> favors capture of CO₂ over N₂. DFT calculations provided rationale for the intriguing 1:1 ratio of amide sorption sites to CO₂ molecules and revealed that the nanochamber of compound <b>1</b> permits the slipped-parallel arrangement of CO₂ molecules, an arrangement found in crystal and gas-phase CO₂ dimer

Synthesis of Two-Dimensional (Cu–S)<i>_n</i> Metal–Organic Framework Nanosheets Applied as Peroxidase Mimics for Detection of Glutathione

Facilely synthesized peroxidase-like nanozymes with high catalytic activity and stability may serve as effective biocatalysts. The present study synthesizes peroxidase-like nanozymes with multinuclear active sites using two-dimensional (2D) metal–organic framework (MOF) nanosheets and evaluates them for their practical applications. A simple method involving a one-pot bottom-up reflux reaction is developed for the mass synthesis of (Cu–S)n MOF 2D nanosheets, significantly increasing production quantity and reducing reaction time compared to traditional autoclave methods. The (Cu–S)n MOF 2D nanosheets with the unique coordination of Cu(I) stabilized in Cu-based MOFs demonstrate impressive activity in mimicking natural peroxidase. The active sites of the peroxidase-like activity of (Cu–S)n MOF 2D nanosheets were predominantly verified as Cu(I) rather than Cu(II) of other Cu-based MOFs. The cost-effective and long-term stability of (Cu–S)n MOF 2D nanosheets make them suitable for practical applications. Furthermore, the inhibition of the peroxidase-like activity of (Cu–S)n MOF nanosheets by glutathione (GSH) could provide a simple strategy for colorimetric detection of GSH against other amino acids. This work remarkably extends the utilization of (Cu–S)n MOF 2D nanosheets in biosensing, revealing the potential for 2D (Cu–S)n MOFs