Cra. Rajendram et Pe. Hoggard, LIGAND-FIELD PARAMETERS IN PENTAAMMINE COMPLEXES OF CHROMIUM(III) WITH A CARBON-OXYGEN OR PHOSPHORUS-OXYGEN DONOR, Transition metal chemistry, 21(1), 1996, pp. 61-63
Coordination of oxyphosphorus ligands to pentaamminechromium(III) lowe
rs the ligand field strength of the ammines to a much greater extent t
han trichloroacetate. This presumably signifies a weaker metal-nitroge
n bond, and may contribute to the reluctance of the amines in aminopho
sphonate ligands to coordinate.