A Highly Symmetric Porous Framework with Multi-intersecting Open Channels

A porous anionic framework with cubic symmetry and multi-intersecting open channels, {[H 2 tmdp] 3 [In 6 (btc) 8 ]·40H 2 O} n (1 ) (tmdp= 4,4‘-trimethylene dipiperidine, H 3 btc=1,3,5-benzenetricarboxylic acid), is reported. Complex 1 crystallizes in the cubic space group I 4̄3d ( a = b = c = 20.3732(8) Å, V = 8456.2(6) Å 3, and Z = 2). Its cagelike units, In 9 (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 +, NH 4 +, Ca 2+, Sr 2+, and Ba 2+ .