Crystal structures of two bis-carbamoyl-methyl-phosphine oxide (CMPO) compounds

Crystal structure of a tris(2-amino-eth-yl)methane capped carbamoyl-methyl-phosphine oxide compound

The mol-ecular structure of the tripodal carbamoyl-methyl-phosphine oxide compound diethyl {[(5-[2-(di-eth-oxy-phosphor-yl)acetamido]-3-{2-[2-(di-eth-oxy-phos-phor-yl)acetamido]-eth-yl}pent-yl)carbamo-yl]meth-yl}phospho-nate, C25H52N3O12P3, features six intra-molecular hydrogen-bonding inter-actions. The phospho-nate groups have key bond lengths ranging from 1.4696 (12) to 1.4729 (12) Å (P=O), 1.5681 (11) to 1.5811 (12) Å (P-O) and 1.7881 (16) to 1.7936 (16) Å (P-C). Each amide group adopts a nearly perfect trans geometry, and the geometry around each phophorus atom resembles a slightly distorted tetra-hedron.

Two Beta-Phosphorylamide Compounds as Ligands for Sm3+, Eu3+, and Tb3+: X-ray Crystallography and Luminescence Properties

This paper describes the synthesis of two beta-phosphorylamide ligands and their coordination chemistry with the Ln ions Tb³⁺, Eu³⁺, and Sm³⁺. Both the ligands and Ln complexes were characterized by IR, NMR, MS, and X-ray crystallography. The luminescence properties of the Tb³⁺ and Eu³⁺ complexes were also characterized, including the acquisition of lifetime decay curves. In the solid state, the Tb³⁺ and Sm³⁺ ligand complexes were found to have a 2:2 stoichiometry when analyzed by X-ray diffraction. In these structures, the Ln ion was bound by both oxygen atoms of each beta-phosphorylamide moiety of the ligands. The Tb³⁺ and Eu³⁺ complexes were modestly emissive as solutions in acetonitrile, with lifetime values that fell within typical ranges.