1,5-Diaza-3,7-diphosphacyclooctanes are organophosphorus compounds with the formula [R'NCH2P(R)CH22, often abbreviated PR2NR'2. They are air-sensitive white solids that are soluble in organic solvents. The ligands exist as meso and d,l- diastereomers, but only the meso forms function as bidentate ligands. [1] [2]
Some metal-PR2NR'2 complexes catalyze the hydrogen evolution reaction as well as the oxidation of hydrogen (H2). The catalytic mechanism involves the interaction of substrate with the amines in the second coordination sphere. [3] [4]
The ligands are prepared by the condensation of a primary phosphine, formaldehyde, and a primary amine: [5]
Diazadiphosphacyclooctanes function as chelating diphosphine ligands. Typical nickel complexes contain two such ligands are give the formula [Ni(PR2NR'2)22+.
Cationic complexes of these P2N2 and related ligands often exhibit enhanced reactivity toward H2. These complexes serve as electrocatalysts for H2 evolution.
Azadiphosphacycloheptanes are a related family of diphosphines, but containing only one amine. They are prepared by condensation of 1,2-bis(phenylphosphino)ethane, formaldehyde, and a primary amine. [6] From the meso-isomer, typical nickel complexes contain two such ligands, i.e. [Ni(PR2NR')22+. When bound to metals, these ligands adopt a conformation similar to that of 1,4-diazacycloheptanes. Acyclic phosphine-amine ligands have the formula (R2PCH2)NR'.
1,5-Diaza-3,7-diphosphacyclooctanes are organophosphorus compounds with the formula [R'NCH2P(R)CH22, often abbreviated PR2NR'2. They are air-sensitive white solids that are soluble in organic solvents. The ligands exist as meso and d,l- diastereomers, but only the meso forms function as bidentate ligands. [1] [2]
Some metal-PR2NR'2 complexes catalyze the hydrogen evolution reaction as well as the oxidation of hydrogen (H2). The catalytic mechanism involves the interaction of substrate with the amines in the second coordination sphere. [3] [4]
The ligands are prepared by the condensation of a primary phosphine, formaldehyde, and a primary amine: [5]
Diazadiphosphacyclooctanes function as chelating diphosphine ligands. Typical nickel complexes contain two such ligands are give the formula [Ni(PR2NR'2)22+.
Cationic complexes of these P2N2 and related ligands often exhibit enhanced reactivity toward H2. These complexes serve as electrocatalysts for H2 evolution.
Azadiphosphacycloheptanes are a related family of diphosphines, but containing only one amine. They are prepared by condensation of 1,2-bis(phenylphosphino)ethane, formaldehyde, and a primary amine. [6] From the meso-isomer, typical nickel complexes contain two such ligands, i.e. [Ni(PR2NR')22+. When bound to metals, these ligands adopt a conformation similar to that of 1,4-diazacycloheptanes. Acyclic phosphine-amine ligands have the formula (R2PCH2)NR'.