A Highly Symmetric Porous Framework with Multi-intersecting Open Channels

A porous anionic framework with cubic symmetry and multi-intersecting open channels, {[H2tmdp]3[In6(btc)8]·40H2O}n (1) (tmdp= 4,4‘-trimethylene dipiperidine, H3btc=1,3,5-benzenetricarboxylic acid), is reported. Complex 1 crystallizes in the cubic space group I4̄3d (a = b = c = 20.3732(8) Å, V = 8456.2(6) Å3, and Z = 2). Its cagelike units, In9(btc)11, constitute a large accessible void with 65.4% of the total volume. The cationic guests located in the channels can be exchanged with inorganic ions, such as K+, NH4+, Ca2+, Sr2+, and Ba2+.