A simultaneously protonated and functionalized silicide cluster [(NHCCu)-Cu-Dipp(eta(4)-Si-9)H](2-) was detected and characterized in liquid ammonia by NMR spectroscopy. Key NMR results were corroborated by theoretical calculations. H-1-NMR line-widths at variable temperatures revealed that proton hopping in the metalated complex [(NHCCu)-Cu-Dipp(eta(4)-Si-9)H](2-) is less pronounced than in the non-complexed silicide [HSi9](3-). Besides [HSi9](3-) and [(NHCCu)-Cu-Dipp(eta(4)-Si-9)H](2-) also the unprotonated analogous cluster [(NHCCu)-Cu-Dipp(eta(4)-Si-9)](3-) was detected in solution. In addition, a new Si-29-NMR signal was obtained in the course of Si-29-NMR studies that we assigned to [(NHCCu)-Cu-Dipp(eta(4)-Si-9)](3-). The isolation of crystals of (K[2.2.2]-crypt)(2)K0.48Rb3.52[(NHCCu)-Cu-Dipp(eta(4)-Si-9)](2) prove the availability of the non-protonated (NHCCu)-Cu-Dipp(eta(4)-Si-9) fragment in solution. To the best of our knowledge the detection of [(NHCCu)-Cu-Dipp(eta(4)-Si-9)H](2-) represents the first case of a protonated and coinage metalated group 14 Zintl cluster in solution so far.