XHX systems which share a hydrogen atom between two identical units X have been studied extensively due to their model character for the anharmonic quantum dynamics of the lightest nucleus and their vibrational bond contributions. Often, they carry a negative overall charge and can be viewed as proton transfer sytems XH• • • X -⇀ ↽ X -• • • HX. For the well-characterised bihalide anions, the proton actually prefers a mid-way position between the two halide ions and for X=Cl, the zero point energy strengthens the bond, instead of weakening it. When X is an organic residue, one can subtly tune the symmetry and conformation of the resulting anionic complexes. This offers a playground for dynamical and kinetic studies. Neutral radical complexes which share a hydrogen atom between two acceptors are less studied, with the exception of the paradigmatic H 3 system which is only (meta)stable in electronically excited states. The neutral FHF complex has remained elusive, whereas in the ClHCl case, helium nanodroplet experiments have shown the absence of a hydrogen bond. For BrHBr, isotope substitution controls the preferred structure in a particularly interesting way. It again appears desirable to extend the study of such neutral XHX species to organic radicals X, where conformational isomerism is expected to influence the energetics and dynamics of the shared hydrogen atom. A natural choice for X is the persistent, sterically hindered TEMPO radical (T) or some of its derivatives, which have shown to be relevant in many fields of molecular science such as controlled radical polymerisation, spin labeling, and redox reactions. T can accept an OH• • • O hydrogen bond from its associated hydroxylamine TEMPO-H (TH). This complex TH-T (Fig. , top) undergoes hydrogen atom transfer to the formally equivalent T-HT structure through a barrier which is expected to be rather high due to the steric hindrance of T and TH.