25-27 November 2015
National Centre for Synchrotron Science
Australia/Melbourne timezone

Heteroleptic Iron(III) {Quinolylsalicylaldimine/Thiosemicarbazone-salicylaldimine} Complexes: Spin crossover, intermolecular structural and solvation features, magnetism and Mössbauer spectra

26 Nov 2015, 13:30
Exhibition space (National Centre for Synchrotron Science)

Exhibition space

National Centre for Synchrotron Science

Australian Synchrotron 800 Blackburn Road Clayton VIC 3168
Board: AM-19
Poster Advanced Materials Poster Session 1


Dr Wasinee Phonsri (Monash University)


The relationship between intermolecular interactions and spin-crossover features such as the abruptness of the spin transition and cooperativity, in crystalline complexes of iron(II) and iron(III), is of much current interest.1 We were particularly interested to make heteroleptic complexes of Hqsal and H2thsa ligands (where Hqsal = quinolylsalicylaldimine2 and H2thsa = thiosemicarbazone-salicylaldiminate3) for the first time, to explore the intermolecular interactions when two different ligands are present around each Fe(III) centre. A family of neutral, heteroleptic iron(III) complexes, [Fe(qsal)(thsa)]∙solvent, is presented where solvent is 0.4BuOH, 0.5MeCN, 0.5THF, as well as two polymorphs of solvent free compounds i.e.[Fe(qsal)(thsa)]. We describe a fascinating array of intermolecular interactions occurring in the various crystals, all containing two distinct Fe sites, including similarities and differences and the importance of a void in the lattice structure wherein solvate molecules sit (or do not sit, in [Fe(qsal)(thsa)] polymorphs), and how these all relate to differences in spin states of neighbouring [Fe(qsal)(thsa)] molecules i.e. HS-HS and spin crossover HS-HS to HS-LS. Supporting information and insights are provided by TGA, PXRD and Mössbauer spectral data.
Keywords Spin crossover, Fe(III), Single crystal X-ray diffraction

Primary author

Dr Wasinee Phonsri (Monash University)


Dr Boujemaa Moubaraki (Monash University) Prof. Guy Jameson (University of Otago) Prof. Keith Murray (Monash University)

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