title: Breathing effect in a cobalt phosphonate upon dehydration/rehydration: a single-crystal-to-single-crystal study.
abstract: Two cobalt phosphonates, [Co2(2,2′-bpy)2(H2O)(pbtcH)] (1) and [Co2(H2O)(pbtcH)(phen)2] (2; pbtcH5=5-phosphonatophenyl-1,2,4-tricarboxylic acid, 2,2′-bpy=2,2′-bipyridine, phen=1,10-phenanthroline), with layer structures are reported. Compound 1 contains O-C-O and O-P-O bridged tetramers of Co4, which are further connected by pbtcH(4-) units to form a layer. In compound 2, the cobalt tetramers made up of water-bridged Co2 dimers and O-P-O linkages are connected into a layer by pbtcH(4-) units. Upon dehydration, compounds 1 and 2 experience single-crystal-to-single-crystal (SC-SC) structural transformations to form [Co2(2,2′-bpy)2(pbtcH)] (1 a) and [Co2(pbtcH)(phen)2] (2 a), respectively. The process is reversible in each case. Notably, a breathing effect is observed for 1, accompanied by pore opening and closing due to the reorientation of the coordinated 2,2′-bpy molecules. The transformation was also monitored by in situ IR measurements. Magnetic studies reveal that antiferromagnetic interactions are mediated between the magnetic centers in compounds 1 and 1 a, whereas ferromagnetic interactions are dominant in compound 2.
authors.forename: Tao
authors.initials: T
authors.lastname: Zheng
authors.forename: Juan M
authors.initials: JM
authors.lastname: Clemente-Juan
authors.forename: Jing
authors.initials: J
authors.lastname: Ma
authors.forename: Lin
authors.initials: L
authors.lastname: Dong
authors.forename: Song-Song
authors.initials: SS
authors.lastname: Bao
authors.forename: Jian
authors.initials: J
authors.lastname: Huang
authors.forename: Eugenio
authors.initials: E
authors.lastname: Coronado
authors.forename: Li-Min
authors.initials: LM
authors.lastname: Zheng