Magneto-Elastic Properties of [Fe(etz)6](BF4)2, [Fe(ptz)6](BF4)2 and [Fe(4ditz)3](BF4)2

Large single crystals of [Fe(etz)6 ](BF4 )2 , [Fe(ptz)6 ](BF4 )2 as well as polycrystalline pellets of [Fe(4ditz)3 ](BF4 )2 were grown. Here we report first measurements of outstanding physical properties like thermal expansion and magnetostriction of these compounds. A discussion of the magnetostriction within a thermodynamic model is provided. Moreover magnetization data of some of these samples are presented.