Targeting the general (4,4)-grid structural motif, we have prepared seven new coordination polymers in the general family [Fe(NCX)2(L)2].(guest) (L=bis-pyridyl-type bridging ligands; X=S, Se) as an extension of the well-established spin crossover framework (SCOF) family. In all cases, the (4,4)-grid topology is formed by the bridging of octahedral iron(ii) sites in the equatorial plane by bis-pyridyl ligands of varying length, flexibility, and intermolecular interaction capacity. In particular, the six ligands n-(4-pyridyl)-isonicotinamide (pin), trans-1,2-bis(4′-pyridyl)ethane (tvp), 1,2-dibromo-1,2-bis(4′-pyridyl)ethane (dbbpe), bis(4-pyridyl)-1,2,4,5-tetrazine (bptz), 4,4′-bis(pyridyl)acetylene (bpac), and 1,4-bis(4-pyridylethynyl)benzene (bpeben) have been utilised. The seven new materials [Fe(NCS)2(pin)2].2(MeCN) (pin-S), [Fe(tvp)2(NCS)2].1/2(tvp).(CH3CH2OH) (tvp-S), [Fe(dbbpe)2(NCS)2].6(CH3CN) (dbbpe-S), [Fe(NCS)2(bptz)2].2(CHCl3).6(EtOH) (bptz-S), [Fe(NCSe)2(bptz)2].4(CHCl3).(EtOH).(H2O) (bptz-Se), [Fe(NCS)2(bpac)2].2(PrOH) (bpac-S), and [Fe(NCS)2(bpeben)2].2(CHCl3) (bpeben-S) all form (4,4)-grids of varying size that are arranged in a parallel stacked topology. Despite being in the [FeN6] coordination environment known to be conducive to spin crossover, these materials all remain high-spin with thermal variation. These results are discussed in context with the large family of SCOFs that show varied spin crossover behaviours.
|Number of pages||9|
|Journal||Australian Journal of Chemistry|
|Publication status||Published - 1 Jan 2017|
Australian SynchrotronOffice of the Vice-Provost (Research and Research Infrastructure)