So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Bagnall, K. W.; Edwards, J.; Heatley, F. researched the compound: Potassiumtris(1-pyrazolyl)borohydride( cas:18583-60-3 ).Computed Properties of C9H10BKN6.They published the article 《Uranium(IV) poly(pyrazol-1-yl)borate complexes – carbon-13 NMR spectra》 about this compound( cas:18583-60-3 ) in Transplutonium 1975, Proc. Int. Transplutionium Elem. Symp., 4th. Keywords: NMR carbon uranium pyrazolylborate; borate pyrazolyl uranium NMR. We’ll tell you more about this compound (cas:18583-60-3).
13C NMR spectra were obtained for K[HB(Pz)3], UCl2[HB(Pz)3]2 (I), U[HB(Pz)3]4 (II), and (η-C5H5)UCl2[HB(Pz)3] (III) (Pz = pyrazol-1-yl) and the assignments are discussed. Two distinct sets of C resonances were observed in the spectrum of I, the 2 sets being in the ratio 2:1, indicating that the [HB(Pz)3] ligand is bidentate in this complex. There are no large chem. shifts, consistent with the major contribution to proton shift being due to the pseudo-contact mechanism, which depends largely on distance. The spectrum of II can only be assigned in terms of 10-coordinate U, based on the presence of 2 tridentate and 2 bidentate [HB(Pz)3] groups in the mol. The spectrum of III did not show any very large chem. shifts assignable to pyrazole ring C. The 3 sharp resonances at 121.0, 126.0, and 130.6 ppm were assigned to the C atoms of the pyrazole rings of the tridentate pyrazolylborate ligand, and the broad feature centered ∼280 ppm is probably due to the 5 equivalent C atoms of the cyclopentadienyl ring.
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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics