Hückel, E. (1930). Zur quantentheorie der doppelbindung. Eur. Phys. J. A 60: 423–456.14 14 Wade, K. (1971). The structural significance of the number of skeletal bonding electron‐pairs in carboranes, the higher boranes and borane anions, and various transition‐metal carbonyl cluster compounds. Chem. Commun.: 792–793.
15 15 Wade, K. (1976). Structural and bonding patterns in cluster chemistry. Adv. Inorg. Chem. Radiochem. 18: 1–66.
16 16 Mingos, D.M.P. (1972). A general theory for cluster and ring compounds of the main group and transition elements. Nat. Phys. Sci. 236: 99–102.
17 17 Mingos, D.M.P. (1984). Polyhedral skeletal electron pair approach. Acc. Chem. Res. 17: 311–319.
18 18 Zintl, E., Goubeau, J., and Dullenkopf, W. (1931). Metals and alloys. I. Saltlikecompounds and intermetallic phases of sodium in liquid ammonia. Z. Phys. Chem. 154: 1–46.
19 19 Zintl, E. and Kaiser, H. (1933). Metals and alloys. VI. Ability of elements to form negative ions. Z. Anorg. Allgem. Chem. 211: 113–131.
20 20 Saito, S. and Ohnishi, S. (1987). Stable (Na19)2 as a giant alkali‐metal‐ atom dimer. Phys. Rev. Lett. 59: 190–193.
21 21 Gaussian 16 (2016). Revision C.01. Wallingford, CT: Gaussian, Inc.
22 22 Perdew, J.P., Burke, K., and Ernzerhof, M. (1996). Generalized gradient approximation made simple. Phys. Rev. Lett.77: 3865.
23 23 Sun, W.G., Wang, J.J., Lu, C. et al. (2017). Evolution of the structural and electronic properties of medium‐sized sodium clusters: a honeycomb‐like Na20 cluster. Inorg. Chem. 56: 1241–1248.
24 24 Hakkinen, H. and Manninen, M. (1996). How “magic” is a magic cluster? Phys. Rev. Lett. 76: 1599–1602.
25 25 Cheng, L., Zhang, X., Jin, B., and Yang, J. (2014). Superatom‐atom superbonding in metallic clusters: a new look to the mystery of an Au20 pyramid. Nanoscale 6: 12440–12444.
26 26 Wang, Z.W. and Palmer, R.E. (2012). Direct atomic imaging and dynamical fluctuations of the tetrahedral Au20 cluster. Nanoscale 4: 4947–4949.
27 27 Leuchtner, R.E., Harms, A.C., and Castleman, A.W. Jr. (1989). Thermal metal cluster anion reactions: behavior of aluminum clusters with oxygen. J. Chem. Phys. 91: 2753–2754.
28 28 Li, X., Wu, H., Wang, X.B., and Wang, L.S. (1998). s−p hybridization and electron shell structures in aluminum clusters: a photoelectron spectroscopic study. Phys. Rev. Lett. 81: 1909–1912.
29 29 Rao, B.K. and Jena, P. (1999). Evolution of the electronic structure and properties of neutral and charged aluminum clusters: a comprehensive analysis. J. Chem. Phys. 111: 1890.
30 30 Khanna, S.N. and Jena, P. (1994). Designing ionic solids from metallic clusters. Chem. Phys. Lett. 219: 479–483.
31 31 Zheng, W.‐J., Thomas, O.C., Lippa, T.P. et al. (2006). The ionic KAl13 molecule: a stepping stone to cluster assembled materials. J. Chem. Phys. 124: 144304–144305.
32 32 Bergeron, D.E., Castleman, A.W. Jr., Morisato, T., and Khanna, S.N. (2004). Formation of Al13I−: evidence for the superhalogen character of Al13. Science 304: 84–87.
33 33 Han, Y.K. and Jung, J. (2008). Does the “superatom” exist in halogenated aluminum clusters? J. Am. Chem. Soc. 130: 2–3.
34 34 Jung, J., Kim, H., and Han, Y.K. (2011). Can an electron‐shell closing model explain the structure and stability of ligand‐stabilized metal clusters? J. Am. Chem. Soc. 133: 6090–6095.
35 35 Liu, F., Mostoller, M., Kaplan, T. et al. (1996). Evidence for a new class of solids: first principles study of K(Al13). Chem. Phys. Lett. 248: 213.
36 36 Huang, C., Fang, H., Whetten, R., and Jena, P. (2020). Robustness of superatoms and their potential as building blocks of materials: Al13− vs B(CN)4−. J. Phys. Chem. C 124: 6435–6440.
37 37 Clayborne, P.A., Lopez‐Acevedo, O., Whetten, R.L. et al. (2011). The Al50Cp*12 cluster – A 138‐electron closed shell (L = 6) superatom. Eur. J. Inorg. Chem. 2011: 2649–2652.
38 38 Walter, M., Akola, J., Lopez‐Acevedo, O. et al. (2008). A unified view of ligand‐protected gold clusters as superatom complexes. Proc. Natl. Acad. Sci. U. S. A. 105: 9157–9162.
39 39 Jadzinsky, P.D., Calero, G., Ackerson, C.J. et al. (2007). Structure of a thiol monolayer‐protected gold nanoparticle at 1.1 Å resolution. Science 318: 430–433.
40 40 Castleman, A.W. and Khanna, S.N. (2009). Clusters, superatoms, and building blocks of new materials. J. Phys. Chem. C 113: 2664–2675.
41 41 Claridge, S.A., Castleman, A.W., Khanna, S.N. et al. (2009). Cluster‐assembled materials. ACS Nano 3: 244–255.
42 42 Shafai, G., Hong, S., Bertino, M., and Rahman, T.S. (2009). Effect of ligands on the geometric and electronic structure of Au13 clusters. J. Phys. Chem. C 113: 12072–12078.
43 43 Zhang, Z.‐G., Xu, H.‐G., Feng, Y., and Zheng, W. (2010). Communications: investigation of the superatomic character of Al13 via its interaction with sulfur atoms. J. Chem. Phys. 132: 161103.
44 44 Gutsev, G.L. and Boldyrev, A.I. (1981). DVM‐Xα calculations on the ionization potentials of M Xk+1 − complex anions and the electron affinities of M Xk+1 “superhalogens”. Chem. Phys. 56: 277–283.
45 45 Gutsev, G.L. and Boldyrev, A.I. (1982). DVM Xα calculations on the electronic structure of “superalkali” cations. Chem. Phys. Lett. 92: 262–266.
46 46 Lievens, P., Thoen, P., Bouckaert, S. et al. (1999). Ionization potentials of LinO (2 < n < 70) clusters: experiment and theory. J. Chem. Phys. 110: 10316–10329.
47 47 Gutsev, G.L., Bartlett, R.J., Boldyrev, A.I., and Simons, J. (1997). Adiabatic electron affinities of small superhalogens: LiF2, LiCl2, NaF2, and NaCl2. J. Chem. Phys. 107: 3867–3875.
48 48 Bartlett, N. and Lohmann, D.H. (1962). Dioxygenyl hexafluoroplatinate (V), O2 + [PtF6] −. Proc. Chem. Soc., London 3: 115–116.
49 49 Bartlett, N. (1962). Xenon hexafluoroplatinate (V) Xe+ [PtF6] −. Proc. Chem. Soc., London 6: 218.
50 50 Giri, S., Behera, S., and Jena, P. (2014). Superalkalis and superhalogens as building blocks of supersalts. J. Phys. Chem. A 118: 638–645.
51 51 Koirala, P., Willis, M., Kiran, B. et al. (2010). Superhalogen properties of fluorinated coinage metal clusters. J. Phys. Chem. C 114: 16018–16024.
52 52 Willis, M., Götz, M., Kandalam, A.K. et al. (2010). Hyperhalogens: discovery of a new cass of highly electronegative species. Angew. Chem. Int. Ed. 49: 8966–8970.
53 53 Knight, D.A., Zidan, R., Lascola, R. et al. (2013). Synthesis, characterization, and atomistic modeling of stabilized highly pyrophoric Al(BH4)3 via the formation of the hypersalt K[Al(BH4)4]. J. Phys. Chem. C 117: 19905–19915.
54 54 Chen, G., Zhao, T., Wang, Q., and Jena, P. (2019). Rational design of stable dianions and the concept of superchalcogens. J. Phys. Chem. A 123: 5753–5761.
55 55 Pyykkö, P. and Runeberg, N. (2002). Icosahedral Wau12: a predicted closed‐shell species, stabilized by aurophilic attraction and relativity and in accord with the 18‐electron
