Competition in Coordination Assemblies: 1D-Coordination Polymer or 2D-Nets Based on Co(NCS) 2 and 4'-(4-methoxyphenyl)-3,2':6',3″-terpyridine

• Published in: Polymers 2019-07, Vol.11 (7), p.1224
• Main Authors: Rocco, Dalila, Prescimone, Alessandro, Klein, Y Maximilian, Gawryluk, Dariusz J, Constable, Edwin C, Housecroft, Catherine E
• Format: Article
• Language: English
• Subjects: Bulk sampling; Chloroform; Coordination polymers; Crystal growth; Crystallization; Experiments; Ligands; Nitrates; Nitrogen; Polymers; Room temperature; Single crystals; Thiocyanates; X ray powder diffraction; X-ray diffraction
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym11071224

The synthesis and characterization of 4'-(4-methoxyphenyl)-3,2':6',3″-terpyridine ( ) (IUPAC PIN 2 -(4-methoxyphenyl)-1 ,2 :2 ,3 -terpyridine) are described, and its coordination behaviour with cobalt(II) thiocyanate has been investigated. In a series of experiments, crystals were grown at room temperature by layering a MeOH solution of Co(NCS) over a CHCl solution of using 1:1, 1:2 or 2:1 molar ratios of metal salt-to-ligand. Crystals harvested within 2-3 weeks proved to be the 1D-coordination polymer [Co( )(NCS) (MeOH) ] and powder X-ray diffraction (PXRD) confirmed that the crystals selected for single-crystal X-ray diffraction were representative of the bulk samples. Longer crystallization times with a Co(NCS) to molar ratio of 1:1 yielded crystals of [Co( )(NCS) (MeOH) ] (1D-chain) and the pseudopolymorphs [{Co( ) (NCS) }·3MeOH] and [{Co( ) (NCS) }·2.2CHCl ] ((4,4)-nets), each type of crystal originating from a different zone in the crystallization tube. PXRD for this last experiment confirmed that the dominant product in the bulk sample was the 1D-coordination polymer.