Currently, I am working with the nanosystems which are used as an MRI contrast agent. In MRI experiment, If Fe concentration as mg/ml then the relaxivity unit expressed in mL mg-1 s-1. I want to express my relaxivity unit in mM-1S-1. For expressing the relaxivity unit in per millimole per second, I require the molecular weight of the sample. I am unable to find a way to calculate the Mol. Wt. of as synthesized FePt@CdTe which is coated with glutathione.
I think you come into the problem of defining what a mole of your FePt nanosystem actually is. I guess that what you produce (or buy) does possesss a size distribution, so you're dealing with non-identical objects. The definition of the mole is not well suited for such a situation imho.
If you were to define 1 mole equivalent as the Avogadro number of particles, then you need a thorough statistical analysis of your particle ensembles. As a result, you could determine the average weight per particle (plus standard deviation and more ample information in case the distributions are not simple [bimodal, for example, would qualify as "not simple"]). You can then relate weight to "effective moles".
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