Synthesis, Structure, and H₂/CO₂ Adsorption in a Three-Dimensional 4‑Connected Triorganotin Coordination Polymer with a sqc Topology

A 4-connected triorganotin 3D coordination polymer in a sqc topology has been shown to possess 1D microchannels along its crystallographic <i>a</i> axis. This main-group-element-containing framework structure shows selective gas adsorption, preferring CO₂ and H₂ over N₂

Synthesis, Structure, and H₂/CO₂ Adsorption in a Three-Dimensional 4‑Connected Triorganotin Coordination Polymer with a sqc Topology

A 4-connected triorganotin 3D coordination polymer in a sqc topology has been shown to possess 1D microchannels along its crystallographic <i>a</i> axis. This main-group-element-containing framework structure shows selective gas adsorption, preferring CO₂ and H₂ over N₂

Structure and Gas Sorption Behavior of a New Three Dimensional Porous Magnesium Formate

A new three-dimensional magnesium formate polymorph, namely, γ-[Mg3(O2CH)6] has been synthesized via in situ formate anion generation method. γ-Mg-formate crystallizes in space group Pbcn, and structural determination by X-ray single crystal diffraction reveals a three-dimensional network of Mg2+ linked by formate anions. All formate anions possess similar binding mode to the metal center with one oxygen of a particular formate anion binds to one metal center (μ1 oxygen) and other oxygen binds to two metal centers (μ2 oxygen). N2 adsorption studies indicate that the framework displays permanent porosity. The specific surface area of γ-Mg-formate (BET, 120 m2 gm−1) is lower than the α- polymorph (BET, 150 m2 gm−1). However, the initial hydrogen uptake of γ-Mg-formate reached almost 1.0 wt % when the adsorbate pressure approached 760 Torr at 77 K. This is higher than the hydrogen uptake of α-Mg-formate (0.6 wt %). γ-Mg-formate, shows a moderate affinity and capacity for CO2 (3.4 Å kinetic diameter) at 298 K. The CO2 uptake at 760 Torr is 2.01 mmol gm−1(47.0 cc gm−1). Although this CO2 uptake is somewhat modest, it compares well with the CO2 uptake of several Mg-MOFs and ZIFs reported in the literature

Structure and Gas Sorption Behavior of a New Three Dimensional Porous Magnesium Formate

A new three-dimensional magnesium formate polymorph, namely, γ-[Mg3(O2CH)6] has been synthesized via in situ formate anion generation method. γ-Mg-formate crystallizes in space group Pbcn, and structural determination by X-ray single crystal diffraction reveals a three-dimensional network of Mg2+ linked by formate anions. All formate anions possess similar binding mode to the metal center with one oxygen of a particular formate anion binds to one metal center (μ1 oxygen) and other oxygen binds to two metal centers (μ2 oxygen). N2 adsorption studies indicate that the framework displays permanent porosity. The specific surface area of γ-Mg-formate (BET, 120 m2 gm−1) is lower than the α- polymorph (BET, 150 m2 gm−1). However, the initial hydrogen uptake of γ-Mg-formate reached almost 1.0 wt % when the adsorbate pressure approached 760 Torr at 77 K. This is higher than the hydrogen uptake of α-Mg-formate (0.6 wt %). γ-Mg-formate, shows a moderate affinity and capacity for CO2 (3.4 Å kinetic diameter) at 298 K. The CO2 uptake at 760 Torr is 2.01 mmol gm−1(47.0 cc gm−1). Although this CO2 uptake is somewhat modest, it compares well with the CO2 uptake of several Mg-MOFs and ZIFs reported in the literature

Construction of Crystalline 2D Covalent Organic Frameworks with Remarkable Chemical (Acid/Base) Stability via a Combined Reversible and Irreversible Route

Two new chemically stable [acid and base] 2D crystalline covalent organic frameworks (COFs) (TpPa-1 and TpPa-2) were synthesized using combined reversible and irreversible organic reactions. Syntheses of these COFs were done by the Schiff base reactions of 1,3,5-triformylphloroglucinol (Tp) with p-phenylenediamine (Pa-1) and 2,5-dimethyl-p-phenylenediamine (Pa-2), respectively, in 1:1 mesitylene/dioxane. The expected enol–imine (OH) form underwent irreversible proton tautomerism, and only the keto–enamine form was observed. Because of the irreversible nature of the total reaction and the absence of an imine bond in the system, TpPa-1 and TpPa-2 showed strong resistance toward acid (9 N HCl) and boiling water. Moreover, TpPa-2 showed exceptional stability in base (9 N NaOH) as well

Efficient and Stereoselective Nitration of Mono- and Disubstituted Olefins with AgNO₂ and TEMPO

Nitroolefin is a common and versatile reagent. Its synthesis from olefin is generally limited by the formation of mixture of <i>cis</i> and <i>trans</i> compounds. Here we report that silver nitrite (AgNO₂) along with TEMPO can promote the regio- and stereoselective nitration of a broad range of olefins. This work discloses a new and efficient approach wherein starting from olefin, nitroalkane radical formation and subsequent transformations lead to the desired nitroolefin in a stereoselective manner

Efficient and Stereoselective Nitration of Mono- and Disubstituted Olefins with AgNO₂ and TEMPO

Nitroolefin is a common and versatile reagent. Its synthesis from olefin is generally limited by the formation of mixture of <i>cis</i> and <i>trans</i> compounds. Here we report that silver nitrite (AgNO₂) along with TEMPO can promote the regio- and stereoselective nitration of a broad range of olefins. This work discloses a new and efficient approach wherein starting from olefin, nitroalkane radical formation and subsequent transformations lead to the desired nitroolefin in a stereoselective manner

Construction of Crystalline 2D Covalent Organic Frameworks with Remarkable Chemical (Acid/Base) Stability via a Combined Reversible and Irreversible Route

Two new chemically stable [acid and base] 2D crystalline covalent organic frameworks (COFs) <b>(TpPa-1</b> and <b>TpPa-2</b>) were synthesized using combined reversible and irreversible organic reactions. Syntheses of these COFs were done by the Schiff base reactions of 1,3,5-triformylphloroglucinol (<b>Tp</b>) with <i>p</i>-phenylenediamine (<b>Pa-1</b>) and 2,5-dimethyl-<i>p</i>-phenylenediamine (<b>Pa-2</b>), respectively, in 1:1 mesitylene/dioxane. The expected enol–imine (OH) form underwent irreversible proton tautomerism, and only the keto–enamine form was observed. Because of the irreversible nature of the total reaction and the absence of an imine bond in the system, <b>TpPa-1</b> and <b>TpPa-2</b> showed strong resistance toward acid (9 N HCl) and boiling water. Moreover, <b>TpPa-2</b> showed exceptional stability in base (9 N NaOH) as well

Construction of Crystalline 2D Covalent Organic Frameworks with Remarkable Chemical (Acid/Base) Stability via a Combined Reversible and Irreversible Route

Two new chemically stable [acid and base] 2D crystalline covalent organic frameworks (COFs) <b>(TpPa-1</b> and <b>TpPa-2</b>) were synthesized using combined reversible and irreversible organic reactions. Syntheses of these COFs were done by the Schiff base reactions of 1,3,5-triformylphloroglucinol (<b>Tp</b>) with <i>p</i>-phenylenediamine (<b>Pa-1</b>) and 2,5-dimethyl-<i>p</i>-phenylenediamine (<b>Pa-2</b>), respectively, in 1:1 mesitylene/dioxane. The expected enol–imine (OH) form underwent irreversible proton tautomerism, and only the keto–enamine form was observed. Because of the irreversible nature of the total reaction and the absence of an imine bond in the system, <b>TpPa-1</b> and <b>TpPa-2</b> showed strong resistance toward acid (9 N HCl) and boiling water. Moreover, <b>TpPa-2</b> showed exceptional stability in base (9 N NaOH) as well