You will not be able to just nitrate it. 1,2,3-triazole cannot be directly nitrated, even "under rigorous conditions". It is thought that the reason
for this phenomena is a charge sheilding effect, as the nitrogens pull electron charge distribution away from the carbon atoms, effectively giving
them a partial positive charge, and repeling nitronium cations that are the mechanism through which nitration reactions proceed.
(4-nitro-1,2,3-triazole can however be further nitrated, as the nitro group on the carbon apparently defeats the shielding effect) This is
the same reason why 5-methyl tetrazole cannot be nitrated (at least not directly). Radical nitration may be a possible way around this problem.
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