17O chemical shift

    Dear Colleagues,

    I would like to know if someone know the chemical shift of 17O2 gas and if I need to use a special NMR tube to get a 17O spectrum, because I have a broad line in my 17O NMR spectrum and I suppose that it is not from my enriched sample.

    If someone has comments or experience with 17O NMR, I will appreciate very much hear about it.

    Thanks in advance,

       Miriam