Complementary in situ reactivity of isomeric dipyridylamide precursors and its effect on dimensionality of cadmium 5-nitroisophthalate coordination polymers

• Cadmium coordination polymers with 5-nitroisophthalic acid (H2nip).
• In situ hydrolysis of dipyridylamide precursors.
• 3-Aminopyridine ligands from 3-pyridylisonicotinamide, forming 1-D ladders.
• Nicotinate ligands from 3-pyridylnicotinamide, forming (6,3) net motif.

Hydrothermal treatment of cadmium nitrate, 5-nitroisophthalic acid (H2nip) and one of two isomeric dipyridylamides resulted in coordination polymer crystalline solids that manifested different in situ reactivity and dimensionality, as ascertained by single crystal X-ray diffraction. Hydrolysis of 3-pyridylisonicotinamide (3-pina) afforded the 3-aminopyridine (3-ampyr) ligands observed in the 1-D ladder polymer {[Cd(nip)(3-ampyr)(H2O)]⋅2H2O}n (1). Conversely, hydrolysis of the isomeric precursor 3-pyridylnicotinamide (3-pna) generated the monoanionic nicotinate ligands in the 2-D coordination polymer [Cd2(nip)(nic)2(H2O)2]n (2). Compound 2 displays {Cd2(OCO)2} eight-membered ring dimeric units linked into (6,3) graphite-type slab motifs. Luminescent properties of these two new materials are also presented.

Reaction of cadmium nitrate, 5-nitroisophthalic acid (H2nip) and one of two isomeric dipyridylamides resulted in coordination polymer crystalline solids that manifested different in situ reactivity and dimensionality.Figure optionsDownload as PowerPoint slide