Syntheses, Crystal Structures, and Physical Properties of Two Noninterpenetrated Pillar-Layered Metal–Organic Frameworks Based on N,N′‑Di(4-pyridyl)-1,4,5,8-naphthalenetetracarboxydiimide Pillar

Two 3D noninterpenetrated pillar-layered metal–organic frameworks have been synthesized under solvothermal reactions based on a N,N′-di(4-pyridyl)-1,4,5,8-naphthalenetetracarboxydiimide (DPNDI) pillar. Single-crystal X-ray diffraction analyses revealed that compound [Co3(BDC)3(DPNDI)(DMF)2]·2CH3CN (1) displays an eight-connected hex net with Schläfli symbol 36·418·53·6 and consists of a DPNDI pillar and 2D 36 net layer that was constructed from a pinwheel trimetallic secondary building unit and 1,4-benzenedicarboxylate (BDC) linker. Compound [Zn2(HFIPBB)2(DPNDI)]·8DMF (2) exhibits a six-connected mab net with Schläfli symbol 44·610·8 and consists of a DPNDI pillar and 2D wavelike 44 net layer with helical channels that was constructed from a paddlewheel dimetallic secondary building unit and bent V-type 4,4′-(hexafluoroisopropylidene)bis(benzoate) linker. The phase purity, thermal stability, and N2 adsorption/desorption of 1 and 2 were measured; the antiferromagnetic property of 1 as well as the photochromic phenomenon of 2 have also been investigated and discussed.