Luminescent cadmium 1,3-adamantanedicarboxylate coordination polymers with diverse topologies depending on dipyridylamide ligands
Cadmium 1,3-adamantanedicarboxylate (adc) coordination polymers with dipyridylamide ligands are reported. The dimensionality depends on the dipyridylamide length and nitrogen donor disposition. {[Cd(adc)(3-pna)(H2O)]·6H2O}n (3-pna=3-pyridylnicotinamide) shows a structurally intriguing water molecule...
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Published in | Inorganica Chimica Acta Vol. 461; pp. 92 - 101 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.05.2017
Elsevier Science Ltd |
Subjects | |
Online Access | Get full text |
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Summary: | Cadmium 1,3-adamantanedicarboxylate (adc) coordination polymers with dipyridylamide ligands are reported. The dimensionality depends on the dipyridylamide length and nitrogen donor disposition. {[Cd(adc)(3-pna)(H2O)]·6H2O}n (3-pna=3-pyridylnicotinamide) shows a structurally intriguing water molecule tape (pictured).
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•Cadmium 1,3-adamantanedicarboxylate (adc) coordination polymers.•Dimensionality and topology depend on dipyridylamide coligands.•Co-crystallized water molecule clusters and tapes.•Intense solid state blue-violet luminescence on ultraviolet excitation.
Hydrothermal reaction of cadmium nitrate, 1,3-adamantanedicarboxylic acid (adcH2), and a hydrogen-bonding capable dipyridylamide ligand afforded five crystalline coordination polymers whose dimensionality depends on the dipyridylamide length and nitrogen donor disposition. The five new phases were structurally characterized via single-crystal X-ray diffraction. [Cd(adc)(4-pmina)]n (1, 4-pmina=4-pyridylmethylisonicotinamide) displays a (4,4) grid topology with [Cd(adc)]n chains pillared by the dipodal dipyridylamide ligands. {[Cd(adc)(4-pmna)(H2O)]·4H2O}n (2, 4-pmna=4-pyridylmethylnicotinamide) displays a similar layered topology, but with octameric water molecule clusters residing in the interlamellar regions. {[Cd(adc)(3-pna)(H2O)]·6H2O}n (3, 3-pna=3-pyridylnicotinamide) possesses 1-D ribbon submotifs due to the syn-conformation and shorter tether length of the dipyridylamide ligands. Compound 3 entrains intriguing “infinite” water molecule tapes comprised of 4- and 5-membered rings. {[Cd2(adc)2(3-pina)2]·H2O}n (4, 3-pina=3-pyridylisonicotinamide) manifests a 4-connected 3D 658cds topology. The minor coordination polymer chain product {[Cd(adc)(3-pyram)2(H2O)]·2H2O}n (5) was isolated along with 4 (3-pyram=3-pyridylamine). Luminescent behavior in 1–4 is attributed to intra-ligand molecular orbital transitions. The new phases were also surveyed for the ability to detect nitrobenzene in ethanol suspension. Thermal decomposition behavior is also discussed herein. |
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ISSN: | 0020-1693 1873-3255 |
DOI: | 10.1016/j.ica.2017.02.015 |