K. Rajagopal

l‐Leucinium oxalate

In the title compound, C6H14NO2+.C2HO4-, the leucine molecule exists in the cationic form, with a protonated amino group and an uncharged carboxylic acid group. Oxalic acid exists in the mono-ionized state. Pseudo-inversion centres relate the leucinium cations and semi-oxalate anions. The leucinium and semi-oxalate ions form hydrogen-bonded, double-layered chains, extending parallel to the b axis. The leucinium cations are arranged in these double layers on opposite sides leading to alternating hydrophobic and hydrophilic layers.

Syntheses and characterisation of amide adducts of uranyl bis (β-diketonates) the molecular structure of [UO2(DBM)2.C4H9CON(3-C5H11)(sec-C4H9)]

The first structurally characterised uranyl bis (β-diketonate)-amide adduct compound [UO2(DBM)2. C4H9CON (3-C5H11) (sec-C4H9)] (DBM = dibenzoylmethanate) shows that the amide ligand bonded through its amido oxygen atom to the uranyl group. The average bond distances for U–O(uranyl), U–O(DBM) and U–O(amide) are 1.778(5), 2.346(5) and 2.411(5)Å respectively.