Fig. 5: ESI(−) MS spectrum of the dried filtrate in MeCN.

a {[K(2.2.2-crypt)][Si9] + 2H}− (m/z = 670.37); b {[K(2.2.2 crypt)][Si9] + 2H + mecn}− (m/z = 711.42).

a {[K(2.2.2-crypt)][Si9] + 2H}− (m/z = 670.37); b {[K(2.2.2 crypt)][Si9] + 2H + mecn}− (m/z = 711.42).