The effect of pressure on clusters, chains and single-molecule magnets

QD Chemistry

Parois, Pascal ; Murrie, Mark

University:University of Glasgow

Department:School of Chemistry

关键词: X-ray crystallography, magnetism, single-molecules magnets, high pressure cell, high pressure magnetism, high pressure crystallography;   

Others  :  http://theses.gla.ac.uk/1789/1/2010paroisphd.pdf

来源: University of Glasgow

【 摘 要 】

This research deals with the investigation of the correlation between the structures of molecules and their magnetic properties as a function of pressure. To do so, different kinds of molecules have been chosen from single-molecules magnets, chains to small molecules. The variety of molecules is necessary to find the best candidates for high pressure X-ray crystallography and high pressure magnetic measurements.Bonds lengths and angles have been successfully altered by using high pressure without the complicating issues of chemical modifications. These structural changes produced asignificant effect on the magnetic properties. A tilting of the Jahn-Teller axis in [Mn12O12(O2CCH2tBu)16(H2O)4].MeNO2.CH2Cl2 has been observed both structurally and magnetically. Modification of π–π interactions from edge to edge interaction to offset π–πstacking in [Gd(PhCOO)3(DMF)]n or a conversion from a CH–π interaction to a π–π interaction in [N(PhCH2)(CH2CH3)3]2[Fe2OCl6] are also reported.