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- Title
Structure and Magnetic Studies on a Series of Two-Dimensional Iron(II) Framework Materials with Varying Ligand Characteristics.
- Authors
Roxburgh, Matthew A. D.; Zaiter, Samantha; Hudson, Xina I. B.; Mullaney, Benjamin R.; Clements, John E.; Moubaraki, Boujemaa; Murray, Keith S.; Neville, Suzanne M.; Kepert, Cameron J.
- Abstract
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(40-pyridyl)ethane (tvp), 1,2-dibromo-1,2-bis(40-pyridyl)ethane (dbbpe), bis(4-pyridyl)-1,2,4,5-tetrazine (bptz), 4,40-bis(pyridyl)acetylene (bpac), and 1,4-bis(4-pyridylethynyl)benzene (bpeben) have been utilised. The seven newmaterials [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.
- Subjects
MOLECULAR structure of ligands; COORDINATION polymers; SPIN crossover
- Publication
Australian Journal of Chemistry, 2017, Vol 70, Issue 5, p623
- ISSN
0004-9425
- Publication type
Article
- DOI
10.1071/CH16586