The MIL-101(Cr) was synthesized by a following procedure reported previously. Cr(NO
3)
3·9H
2O (99%+, from Aldrich), 1,4-benzene dicarboxylic acid (H
2BDC, 99.0%+, from Acros), HF (48%, from Merck) were used as received without further purification.
35 (link) A typical synthesis involves a solution containing chromium(
iii) nitrate Cr(NO
3)
3·9H
2O (400 mg, 1 × 10
−3 mol), 1 × 10
−3 mol of fluorhydric acid, 1,4-benzene dicarboxylic acid H
2BDC (164 mg, 1 × 10
−3 mol) in 4.8 ml H
2O (265 × 10
−3 mol); the mixture is introduced in a hydrothermal bomb which is put during 8 h in an autoclave held at 220 °C. Then, the solution was filtered and the green colored precipitate was washed with DMF and ethanol (10 mL × 3 times) successively. Finally, the fine green colored crystals were obtained and dried in a vacuum oven at 150 °C overnight.
Jin W.W., Li H.J., Zou J.Z., Zeng S.Z., Li Q.D., Xu G.Z., Sheng H.C., Wang B.B., Si Y.H., Yu L, & Zeng X.R. (2018). Conducting polymer-coated MIL-101/S composite with scale-like shell structure for improving Li–S batteries. RSC Advances, 8(9), 4786-4793.