Synthesis and crystal structure of a heteronuclear erbium and yttrium complex with proline: [ErY(pro) ₆₃(H ₂O) ₆]ClO ₄₆

The title complex was synthesized in an aqueous solution at pH≃3. 5, and its crystal structure was determined by X-ray diffraction methods. The complex is triclinic with space group P1, formula C ₃₀H ₆₆O ₄₂N ₆Cl ₆ErY, M _r= 1651. 76, a9.860(2), b=13. 020 (5), c=13. 632(5) Å ; α=109. 32(3), β= 110. 19(2), γ=. 100. 96(2)° V=1456(1) Å ³, Å= ³,D _c = 1. 884 g/cm ³, Z = l, F(000) = 833, μ = 2. 812 mm ^-1; R=0. 046, wR(.F ²)= 0.123 for 4897 reflections with I>2σ(I). The complex is of an infinite chain structure with the neibouring metal ions connected by two bridging carboxyl groups from two different proline molecules. The erbium ion and the yttrium ion statistically lies at the position of the metal ion with M=l/2(Er+Y).