1 Henan Key Laboratory of Polyoxometalate, Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, China. liyamin@henu.edu.cn.
A novel bilayer metal-organic framework is assembled with a perfect intralayer triangular subnet and ideal interlayer Td arrangement between unprecedented crown-like Co7 cluster units, exhibiting high spin frustration.