Archive for October 3rd, 2026

Unrecognised inorganic metalla-aromatic rings? The mystery of (cyclo-N,S)-titanocenes.

Saturday, October 3rd, 2026

Metalla-aromatics have been defined as metallacycles that are derived from the formal replacement of a carbon atom in the framework of an organic aromatic ring with a metal fragment.[1]. Here I explore whether this simple definition can be broadened to sulfur-nitrogen rings which contain few[2],[3] if indeed any[4],[5],[6],[7] carbon atoms and which also happen to be planar aromatic molecules. (more…)

References

  1. D. Chen, Y. Hua, and H. Xia, "Metallaaromatic Chemistry: History and Development", Chemical Reviews, vol. 120, pp. 12994-13086, 2020. https://doi.org/10.1021/acs.chemrev.0c00392
  2. R. Jones, J.L. Morris, A.W. Potts, C.W. Rees, D.J. Rigg, H.S. Rzepa, and D.J. Williams, "Electronic and crystallographic structures of trithiadiazepines", Journal of the Chemical Society, Chemical Communications, pp. 398, 1985. https://doi.org/10.1039/c39850000398
  3. S.T.A.K. Daley, C.W. Rees, and D.J. Williams, "1,3,5,2,4-Trithiadiazepines and 1,3,5,2,4,6-trithiatriazepines, new 10? heteroaromatic systems", Journal of the Chemical Society, Chemical Communications, pp. 55, 1984. https://doi.org/10.1039/c39840000055
  4. P.N. Jagg, P.F. Kelly, H.S. Rzepa, D.J. Williams, J.D. Woollins, and W. Wylie, "The preparation, X-ray crystal structure and theoretical study of [CoCp <sub>2</sub> ][S <sub>3</sub> N <sub>3</sub> ], (Cp = cyclopentadienyl), a novel stacking compound incorporating multiple C–H ⋯ N(p <sub>π</sub> ) interactions", J. Chem. Soc., Chem. Commun., vol. 0, pp. 942-944, 1991. https://doi.org/10.1039/c39910000942
  5. A. Haas, and M. Pryka, "New Pathways in Tellurium‐Chalkogen‐Nitrogen Chemistry: Preparations, Structures, and Properties of Telluraheterocycles", Chemische Berichte, vol. 128, pp. 11-22, 1995. https://doi.org/10.1002/cber.19951280103
  6. J. Galan-Mascaros, A.M. Slawin, J. Derek Woollins, and D.J. Williams, "π-facial interactions between Cl− and [S4N3]+. X-ray crystal structure of [S4N3]Cl", Polyhedron, vol. 15, pp. 4603-4605, 1996. https://doi.org/10.1016/0277-5387(96)00223-9
  7. T. Chivers, and R.S. Laitinen, "Chalcogen–Nitrogen Chemistry", 2021. https://doi.org/10.1142/12397

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