The majority of samples are paramagnetic but some molecules are dimers which might have antiferomagnetic couplings between the transition metals.
I'm not an expert for SQUID magnetometry, but I'm not sure if this is possible with liquids, at least I have only used solids for SQUID. As antiferromagnetic coupling should require very low temperatures, you will have a frozen solution at this point. This would not really be a solution anymore, so you could as well do measurements in solid state. Furthermore, if you have a large quantity of diamagnetic frozen solvent and dilute paramagnetic analytes, this will probably not be very helpful in SQUID measurements, depite the sensitivity. Preparing the samples in an inert gas glovebox should not be a problem.
However, if you are interested in the magnetic properties in (still liquid) solution, I can recommend using an NMR based approach which was proposed by Evans. This is fairly standard and will work with any NMR spectrometer. You can find some information in the linked publications.
http://pubs.acs.org/doi/abs/10.1021/ed049p646
http://pubs.acs.org/doi/abs/10.1021/ed074p815
I'm not an expert for SQUID magnetometry, but I'm not sure if this is possible with liquids, at least I have only used solids for SQUID. As antiferromagnetic coupling should require very low temperatures, you will have a frozen solution at this point. This would not really be a solution anymore, so you could as well do measurements in solid state. Furthermore, if you have a large quantity of diamagnetic frozen solvent and dilute paramagnetic analytes, this will probably not be very helpful in SQUID measurements, depite the sensitivity. Preparing the samples in an inert gas glovebox should not be a problem.
However, if you are interested in the magnetic properties in (still liquid) solution, I can recommend using an NMR based approach which was proposed by Evans. This is fairly standard and will work with any NMR spectrometer. You can find some information in the linked publications.
http://pubs.acs.org/doi/abs/10.1021/ed049p646
http://pubs.acs.org/doi/abs/10.1021/ed074p815
Thank you very Christian. Actually, we have measured the samples in solution state using Evans Method and we observed loss in magnetic moment compared to powder sample. So, we are interested in measuring the temperature dependence magnetic susceptibility using SQUID. The idea was to prepare the samples in glove box and filling them in quartz tube (standard EPR tubes) and then sealing them off and somehow measuring magnetic susceptibility for a range of temperature (4 K to 295 K) that would be from frozen state to liquid state to understand if there is any dimer formations which leads to anti-ferromagnetic couplings and hence we observe less signal.
If you haven't yet searched there, I would suggest a search on SciFinder Scholar and ISI Web of Knowledge (formerly ISI Science Citation Index). Loop a good science librarian in on the search terms. Also, there are some good SQUID labs across Europe, so it might be worth reaching out to someone in your region to see what they think is possible or who would be willing to provide insights.
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