Synthesis and crystal structure of an erbium complex with valine [Er₂(Val)₄(H₂O)₈](ClO ₄)₆·₄H₂O

The title complex was synthesized in aqueous solution, and its crystal structure was determined by X-ray diffraction. The crystal is triclinic space group P1 with a = 1.00935 (9) nm, b = 1.20190 (2) nm, c = 1.28432 (8) nm, α = 95.013(9)°, β= 102.814(5)°, γ = 113.368 (9)°, V = 1.3676(3) nm³, Z = 1, D_c = 1.962 g/cm³. The complex is a dimeric molecule with four bridging carboxyl groups from four valine molecules between two erbium ions. Each erbium ion is coordinated by four oxygen atoms from four carboxyl groups and four oxygen atoms of four water molecules with the coordination number 8, taking a square antiprism arrangement.