Self-Penetrating and Interpenetrating 3D Metal−Organic Frameworks Constructed from the Rigid 1,4-Bis(1-imidazolyl)-benzene Ligand and Aromatic Carboxylate

Abstract

This paper presents four interesting entanglement systems, including one self-penetrating and three interpenetrating frameworks, namely, [Ni 3 (L) 3 (BTC) 2 ·2H 2 O]·6H 2 O ( 1 ), [Mn(L)(HBTC)] ( 2 ), [Ni 2 (L) 2 (BDC) 2 ·2H 2 O]·H 2 O ( 3 ), and [Mn 4 (L) 4 (BDC) 4 ]·H 2 O ( 4 ) (H 3 BTC = 1,3,5-benzenetricarboxylic acid and H 2 BDC = 1,4-benzenedicarboxylic acid), based on a rigid 1,4-bis(1-imidazolyl)benzene (L) ligand. Compound 1 is the first example of a (3,4)-connected self-penetrating three-dimensional (3D) polymer containing two types of catenated rings with the unprecedented (6·8 2 ) 2 (6 2 ·8 4 ) 2 (6 4 ·8 2 ) topology. Compound 3 has self-assembled into a 5-fold interpenetrating 3D structure with diamond nets, while both compounds 2 and 4 display 2-fold interpenetrating 3D structures with α-Po structural topology.