Speaker
Ms
Darunee Sertphon
(School of Chemistry, Monash University, Clayton, Melbourne, Victoria, 3800, Australia)
Description
The new ligands imidazol-4-ylmethylene-aryl amine (4-imaAr; Ar = Bp, Fl) have been prepared by reaction of the aryl amine with imidazole-4-carboxaldehyde.[1,2] Reaction of the ligands with [Fe(H2O)6][ClO4]2 in MeOH or EtOH yields the complexes, [Fe(4-imaBp)3][ClO4]2⋅EtOH 1, [Fe(4-imaBp)3][ClO4]2⋅2MeOH 2, [Fe(4-imaFl)3][ClO4]2 3, and [Fe(4-imaFl)3][ClO4]2⋅3H2O 4. X-ray crystallographic studies reveal strong C-H⋅⋅⋅π and hydrogen bonding interactions or π-π interactions leading to high cooperativity. SQUID magnetic susceptibility studies show that spin crossover varies from gradual to abrupt with the spin transition occurring at temperatures from ca. 150 to 400 K. The substituent groups on the 4-ima ligand significantly impact the spin crossover characteristics.
| Keywords | spin crossover, iron(II) complexes, imidazolyl diimine ligands, molecular magnetism |
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Primary author
Ms
Darunee Sertphon
(School of Chemistry, Monash University, Clayton, Melbourne, Victoria, 3800, Australia)
Co-authors
Dr
Boujemaa Moubaraki
(School of Chemistry, Monash University, Clayton, Melbourne, Victoria, 3800, Australia)
Dr
David James Harding
(Molecular Technology Research Unit Cell, Walailak University, Thasala, Nakhon Si Thammarat, 80161, Thailand)
Prof.
Keith S. Murray
(School of Chemistry, Monash University, Clayton, Melbourne, Victoria, 3800, Australia)
Dr
Lujia Liu
(MacDiarmid Institute for Advanced Materials and Nanotechnology, Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand)
Dr
Phimphaka Harding
(Molecular Technology Research Unit Cell, Walailak University, Thasala, Nakhon Si Thammarat, 80161, Thailand)
Dr
Shane G. Telfer
(MacDiarmid Institute for Advanced Materials and Nanotechnology, Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand)
Dr
Suzanne M. Neville
(School of Chemistry, The University of Sydney, Sydney, 2006 Australia)
