Pendant arm length control of dimensionality in cobalt dipyridylamine coordination polymers containing meta-benzenedicarboxylate ligands

• Published in: Inorganica Chimica Acta Vol. 363; no. 14; pp. 3966 - 3972
• Main Authors: Blake, Karyn M., Braverman, Maxwell A., Nettleman, Joseph H., Sposato, Laura K., LaDuca, Robert L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.11.2010
• Subjects: Antiferromagnetism; Cobalt; Coordination polymer; Dicarboxylate; Dipyridylamine; Antiferromagnetism; Dipyridylamine; Dicarboxylate; Coordination polymer; Cobalt
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2010.07.070

[Co(1,3-phda)(dpa)(H 2O)] n ( 1, 1,3-phda = 1,3-phenylenediacetate) possesses a ruffled (4,4) rhomboid grid 2-D layered structure with an 5-connected sqp supramolecular net. {[Co(1,3-bdc)(dpa)]·3H 2O} n ( 2, 1,3-bdc = 1,3-benzenedicarboxylate) displays a 3-D network structure with 6 58 topology. Antiferromagnetic coupling, in conjunction with zero-field splitting, was evident in both cases. Hydrothermal synthesis has afforded a pair of divalent cobalt coordination polymers containing meta-substituted benzenedicarboxylate and 4,4′-dipyridylamine (dpa) ligands, in which the length of the pendant arms on the anionic components dictates the overall dimensionality. [Co(1,3-phda)(dpa)(H 2O)] n ( 1, 1,3-phda = 1,3-phenylenediacetate) possesses a ruffled (4,4) rhomboid grid 2-D layered structure with an 5-connected sqp supramolecular net. Use of a meta-substituted benzenedicarboxylate with shorter pendant arms generated {[Co(1,3-bdc)(dpa)]·3H 2O} n ( 2, 1,3-bdc = 1,3-benzenedicarboxylate), which displays a 3-D network structure with 6 58 topology. Antiferromagnetic coupling, in conjunction with zero-field splitting, was evident across the supramolecular Co–O–H⋯O–Co patterns in 1 and the syn–syn bridged {Co(OCO)} 2 dimeric units in 2.