Knowledge Bank

The magic number behavior of H$+$(H$2$O)$\mathrm{<mrow\; data-mjx-texclass="ORD">21</mrow>}$ has been well known. Futhermore, this magic number is observed even in the mixed clusters H$+$(H$2$O)(NH$3$) and H$+$(H$2$O)(MeOH) (m $+$ n $=$ 21). This means that NH$3$ or MeOH molecules are compatible with water molecules in the hydrogen bond network of the magic number cluster.\ In the present study, infrared spectroscopy is applied to (CH$3$)$3$N-H$+$-(H$2$O) (n $=$ 1-22), and structures of these clusters are determined with help of density functional theory calculations. As a result, it is demonstrated that no magic number is seen in the case of (CH$3$)$3$N-H$+$-(H$2$O). (CH$3$)$3$N is not a spectator to the hydrogen bond network of protonated water clusters, and it is largely changes the network structure.