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Title: Sulphur-rich molecular magnetic materials
Author: Staniland, Sarah S.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2005
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The work within this thesis is concerned with several different magnetic systems all involving materials that are rich in sulphur and are thus predicted to have strong magnetic coupling through these sulphur atoms. Firstly, a range of molecular salt materials of [dithiazolyl]x[M(dithiolene)2] were synthesised and their magnetic behaviour analysed. Dithiolene complex salts of [BDTA]+ [2]-[6] were found to have a mainly mixed anion-cation stacked structural motif and show a number of interesting magnetic properties, such as an almost perfect one dimensional antiferromagnetic chain system ([BDTA]2[Cu(mnt)2 [2], as well as the conducting charge transfer salt [BDTA][Ni(dmit)2]2 [3] that is the first example of the [BDTA]+ cation behaving as an open shell cation. The [BDTA]2[Fe(tdas)2Cl] salt [5] has the first mixed stacking structural motif of this anion (as it usually dimerises) and this material was found to be paramagnetic. The paramagnetic radical dithiazolyl cation [BBDTA]+ was also co-precipitated with dithiolene complexes to create magnetic salts [11]-[15]. These all showed mixed magnetic effects with some unusual magnetic interactions occurring. [BDTA]+ was also co-crystallised with MC142- anions to form molecular materials containing two dimensional magnetic structure with a square lattice magnetic pathway. This magnetic mechanism provides ideal materials for the study of ground state quantum magnetic effects that are thought to be related to the fundamental mechanism of superconductivity. This work also contains the study of the non interacting magnetic molecular thiophosphine complexes of the form [M((SPR1R2)2N)2] (M = Mn, Co, Ni, R1 = R2 = Ph, iPr and R1=Ph and R2=iPr) which behave as simple paramagnets ([16]-[24]). All M = Mn and Co complexes were found to be simple paramagnetic materials with a strong ligand field splitting.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available