Conference On Molecules to Materials: ICMM2006

Section 2 & Section 3

Home | Sections 2 & 3 | Section 3 cntd & Section 4 | Section 4 cntd Figs6-9 | Section 5 ; References | EUROMAR2006 | An Abstract for the after-effects of an HR PMR study in Solids | Details of the particulars of particiaption in ICMM2006

Bulk solid specimen shape dependences in the molecular, chemical-shift tensor determinations


(the Figures in this article are included as ".jpg" images and mouse-over messages appear when the cursor is placed over the images !)


For an elaboration on the intramolecular aspects of induced fileds (measured as Chemical shifts) Click on Link:


The High Resolution Proton Magnetic Resonance (HR PMR) experiments in Solids have been well described in the literature2. It is reiterated here that the single specimen used for the measurements in HR PMR in solids have been spherically shaped; for reasons that the bulk susceptibility contribution to induced fields within the specimen is zero for the spherical shape of the specimen. This limits the utility of this technique since it is not always possible that the given organic molecular single crystal can be shaped into a sphere for the convenient use for measurement by HR PMR techniques. The current experimental efforts being made to reduce the experimental constraints in making spheres are posted in the WebPages3 of this author. Fig.1 below depicts the situation for the disposition of the experimentally measured principal axis directions of the chemical shift tensor for the proton attached to the aromatic ring and the deviation from the molecular symmetry is obvious in the Fig.1 (a) and when the intermolecular contribution is subtracted then the principal directions conform better to the molecular symmetry requirements




Pyromellitic Acid Dianhydride
icmm06_fig.1.jpg CLICK HERE to view the Full Size
From S.Aravamudhan Mol.Phys. 1979, Vol.34, p 241-255

The considerations which are also pertinent to consequences in magnetic material begin with this effort by which the intermolecular contributions were calculated by rigid lattice summation procedures.                            

Divisions of regions within the specimen
From Proceedings of ICMM2006 : icmm06_fig.2..jpg
Lorentz Sphere & Lorentz Cavity defined

Zero Induced Field within the Sphere
FromProceedings of ICMM2006 : icmm06_fig.3..jpg
Demagnetization Factor & Induced Field
Requirements for HR PMR measurements
From Proceedings of ICMM2006 : icmm06_fig.4..jpg
Lorentz Cavity, Sphere and the outer continuum

This is the text of the Full Paper for the presentation made at the Sant Longowal Institute of Technology, Longowal, Sangrur, Punjab, INDIA on the occasion of the "International Conference on Molecules to Materials" - The ICMM2006 held during March 3-6, 2006.

Click on the link below to display a webpage with links to contributions to events during July 2005 to February 2006.

The contents of pages: index, id1, id2, id3, & id4 of this ite contain the text of the
Full Paper appearing in the Proceedings of ICMM2006 March 3-6, 2006
Section on Materials for the Furure page 13-18; Article #2.3
The contents of page id5 is the Abstract for EPISTEME-2
The contents of page id6 is on EUROMAR2006