Divalent metal succinate/perchlorate coordination polymers incorporating a kinked hydrogen-bonding capable diimine: Chains, layers and a (5,6)-connected binodal network featuring alternating rectangular and hexagonal grids

Abstract

Hydrothermal synthesis has afforded succinate (suc) or 2,2-dimethylsuccinate (dmsuc) perchlorate coordination polymers with divergent dimensionality incorporating the kinked hydrogen-bonding capable diimine tethering ligand 4,4′-dipyridylamine (dpa): {[Co(suc)(Hdpa) 2(H 2O) 2](ClO 4) 2 · 7.5H 2O} n ( 1), {[Cd 3(suc) 2.5(dpa) 2](ClO 4)} n ( 2) and {[Cd 2(dmsuc) 2(dpa)(Hdpa)](ClO 4) · 6H 2O} n ( 3). Influenced by coordination geometry preferences, compound 1 manifests simple cationic one-dimensional (1D) [ Co(suc)(Hdpa) 2 ( H 2 O ) 2 ] n 2 n + polymeric chains, while 2 possesses a unique three-dimensional (3D) binodal (5,6)-connected (4 66 4)(4 106 5) network. The network of 2 can also be viewed as alternating (4,4) rectangular and (6,3) hexagonal grids being joined by pillaring ligands. The steric bulk imparted by the gem-dimethyl substituents within the dmsuc ligands results in a two-dimensional (2D) (6,3) herringbone net in 3. The d 10 derivatives 2 and 3 undergo blue–violet luminescence upon exposure to ultraviolet radiation.