The synthesis, characterization and reactivity studies of the NHC-stabilized complex IDipp ⋅ GeH 2BH 2OTf (1) (IDipp=1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene) are reported. Nucleophilic substitution of the triflate (OTf) group in 1 by phosphine or arsine donors provides access to the cationic group 13/14/15 chains [IDipp ⋅ GeH 2BH 2ERR 1R 2] + (2 E=P; R, R 1=H; R 2= tBu; 3 E=P; R=H; R 1, R 2=Ph; 4 a E=P; R, R 1, R 2=Ph; 4 b E=As; R, R 1, R 2=Ph). These novel cationic chains were characterized by X-ray crystallography, NMR spectroscopy and mass spectrometry. Moreover, the formation of the parent complexes [IDipp ⋅ GeH 2BH 2PH 3][OTf] (5) and [IDipp ⋅ GeH 3][OTf] (6) were achieved by reaction of 1 with PH 3. Accompanying DFT computations give insight into the stability of the formed chains with respect to their decomposition.