Competition in coordination assemblies: 1D-coordination polymer or 2D-nets based on Co(NCS)&lt;sub&gt;2&lt;/sub&gt; and 4'-(4-methoxyphenyl)-3,2':6',3&quot; -terpyridine

Rocco, Dalila; Prescimone, Alessandro; Klein, Y. Maximilian; Gawryluk, Dariusz J.; Constable, Edwin C.; Housecroft, Catherine E.

doi:10.3390/polym11071224

Competition in coordination assemblies: 1D-coordination polymer or 2D-nets based on Co(NCS)₂ and 4'-(4-methoxyphenyl)-3,2':6',3" -terpyridine

Rocco D, Prescimone A, Klein YM, Gawryluk DJ, Constable EC & Housecroft CE

Citation

Rocco, D., Prescimone, A., Klein, Y. M., Gawryluk, D. J., Constable, E. C., & Housecroft, C. E. (2019). Competition in coordination assemblies: 1D-coordination polymer or 2D-nets based on Co(NCS)₂ and 4'-(4-methoxyphenyl)-3,2':6',3" -terpyridine. Polymers, 11(7), 1224 (14 pp.). https://doi.org/10.3390/polym11071224

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:24722

The synthesis and characterization of 4′-(4-methoxyphenyl)-3,2′:6′,3″-terpyridine (2) (IUPAC PIN 2⁴-(4-methoxyphenyl)-1²,2²:2⁶,3²-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)₂ over a CHCl₃ solution of 2 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(2)(NCS)₂(MeOH)₂]_n 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)₂ to 2 molar ratio of 1:1 yielded crystals of [Co(2)(NCS)₂(MeOH)₂]_n (1D-chain) and the pseudopolymorphs [{Co(2)₂(NCS)₂}·3MeOH]_n and [{Co(2)₂(NCS)₂}·2.2CHCl₃]_n ((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.