journal menu
abstracts
Since the discovery of Single-Molecule Magnets (SMMs) in 1993 there has been extensive interest in understanding, developing and tuning the nature of magnetic interactions within SMMs with the intention of gaining greater insight into the nature of these interactions.[1] Typically this is done synthetically using variations in ligand geometry and co-ordination environment to vary magnetic behaviour. More recently it has been demonstrated that high hydrostatic pressure are also an effective mechanism for "tuning" properties such as magnetic susceptibility in a variety of SMMs.[2] The number of studies utilising high hydrostatic pressure to investigate molecular magnetism is extremely limited due to their inherent difficulty however we report a new study investigating the pressure tunabilty of Re(IV) based SMMs. 4d and 5d metal ions such as Re are of interest due their enhanced magnetic exchanges relative to their 3d analogues and Re(IV) based complexes are of particular interest. Previous studies into [ReX6]2- (X = Cl, Br and I) anions demonstrate significant antiferromagnetic coupling, not transmitted through chemical interactions but rather through weak Re-X...X interactions in the solid state which may be easily perturbed at high pressure. [3] Therefore we report an investigation into the tunability of magnetic susceptibility in a variety of [ReX4] based compounds using high pressure magnetic susceptibility measurements and correlate the results with structure observations taken from high pressure single crystal X-ray diffraction experiments. The effects of the removal of solvent trapped in the lattice using temperature and vacuum and the corresponding effect on magnetic behaviour and chemical structure are also reported.
abstracts
Recently we were focused on the synthetic, physicochemical and theoretical evaluation of the properties of borinic 8-oxyquinolinates.[1,2] Such systems are of interest of many groups in the world, as borinic derivatives are promising materials for the preparation of luminescent layers in organic light emitting diodes (OLEDs).[3] Our aim is to trace the impact of structure on properties of the system. Hence we have conducted polymorph screening for highly strain aromatic heteroleptic borinic system. As a result, we are presenting, the very first examples of polymorphism in the group of aromatic borinic 8-oxyquinolinate complexes [(2-fluoro-3-pyridyl) (2,2`-biphenyl)borinic 8-oxyquinolinate)]. We wanted to extend our investigations on high-pressure crystallography. These investigations were prompted by results obtained by other groups which analysed crystal structures of AlQ3, GaQ3 and InQ3 under low and high pressure. Such studies helped to trace a connection between the motifs present in the crystal phases and optical properties of these complexes as a consequence of orbital interactions. On this basis we were interested in investigation of the influence of high pressure on the packing of synthesized and characterized (2-fluoro-3-pyridyl) (4-iodophenyl)borinic 8-oxyquinolinate.
