47.8% |
In ethanol; water; at 110.0℃; for 8.0h;High pressure; Sealed tube; |
General procedure: All chemicals and solvents were of reagent and used as received. Single crystal of complexes 1 and 2 were synthesized by hydrothermal method (Scheme 1). For complex 1, 2-HTP (0.0295g, 0.2mmol), CoSO4·7H2O (0.0876g, 0.3mmol) as a Lewis acid, H2SO4 (0.1ml, 2mol/L) and mixture solvent of H2O/ethanol (3ml) with a volume ratio of 2:1 were added to a rigid Pyrex tube. Note that the deionized water finally trickles in slowly along the wall of the tube, so as to push the chemicals attached to the wall into the bottom of the tube to make the reaction more complete. Shake well after the vacuum seal, then put into the drying oven and heat 8h under 110C, finally cool naturally to room temperature. Whereafter, pink needle-like complex 1 were deposited with a yield of 39.7%. When a similar procedure was performed but with another Lewis acid Cu(CH3COO)2·H2O (0.0417g, 0.2mmol) and CH3COOH (0.1ml, 2mol/L) in place of CoSO4·7H2O and H2SO4, respectively, dark needle-like complex 2 were obtained in a yield of 47.8%. IR (KBr): = 3441 (s), 1650 (m), 1478 (w), 1102 (s), 959 (w), 715 (w), 611 (m), 531 (w) cm-1 for complex 1; and = 3452 (s), 1607 (s), 1480 (w), 1387 (m), 1328 (m), 1147 (m), 1094 (m), 931 (w) cm-1 for complex 2 (Fig. S1). Elemental analyses (EA) experiment was conducted to determine the content of C, H, N element. Calculated for complex 1, C7H10CoN4O6S, Fw=337.18: C, 24.94; H, 2.99; N, 16.62%. Found: C, 25.42; H, 3.19; N, 18.43%; complex 2, C9H8CuN4O2, Fw=267.73: C, 40.38; H, 3.01; N, 20.93%. Found: C, 40.32; H, 3.07; N, 20.99%. |