Synthesis of {[Eu3(DDQ)4(H2O)3(NO3)]·5H2O·6DMF}n(Eu-DDQ)

The preparation of Eu-DDQ was similar to that of Y-DDQ except that Eu(NO₃)₃·6H₂O (0.0612 g, 0.15 mmol) was used instead of Y(NO₃)₃·6H₂O. The yellow crystals were washed with DMF, water and air-dried. Yield: 55% (based on H₂DDQ). Anal. Calcd for C₁₀₆H₁₁₄N₂₃O₃₃Eu₃ (Mr: 2694.08): C, 47.26; H, 4.27; N, 11.96%. Found: C, 46.97; H, 4.32; N, 11.77%. IR (cm⁻¹): 3358(w), 1654(m), 1605(s), 1567(w), 1526(s), 1490(m), 1389(s), 1306(m), 1247(m), 1179(w), 1152(w), 1094(w), 853(w), 779 (s), 741(w), 675(w), 596(w), 569(w).