Bis(pyridyl)-based ligands driven NiII entangled metal-organic frameworks: From a new 1-D + 2-D → 3-D polythreading motifs to a rare 3-fold interpenetrating ths network

• A new polythreaded architecture consisting of 1-D armed chains and 2-D sql sheets
• A rare 3-fold interpenetrating 103-ths network
• Weak antiferromagnetic interactions between the adjacent NiII ions

Reaction of NiII acetate and 4-methylphthalic acid (H2mph) with 1,2-bis(4-pyridyl)ethane (bpa) or 1,2-bis(4-pyridyl)ethene (bpe) affords two 3-D unusual metal–organic frameworks {[Ni(Hmph)2(bpa)(H2O)2][Ni2(mph)2(bpa)3]}n (1) and [Ni2(mph)2(bpe)2(H2O)3]n (2). 1 represents a polythreaded supramolecular architecture consisting of distinct 1-D armed chains and 2-D sql sheets based on the binuclear [Ni2(mph)2] units, however, 2 shows a rare 3-fold interpenetrating 103-ths network.

Assembly of NiII salt and 4-methylphthalic acid with bpa or bpe affords two complexes. The significant difference between 1 and 2 isolated under the same conditions must be ascribed to the nature of N-donor auxiliary ligands.Figure optionsDownload as PowerPoint slide