The synthesis of first and second generation carbosilane dendrimers with end-grafted triethylene glycol methyl ether units is reported. The reaction chemistry of Me 2 Si(CH 2 CH 2 CH 2 SiMe 2 CH 2 (CH 2 CH 2 O) 4 Me) 2 (4), Si(CH 2 CH 2 CH 2 SiMe 2 CH 2 (CH 2 CH 2 O) 4 Me) 4 (5) and Si(CH 2 CH 2 CH 2 SiMe(CH 2 CH 2 CH 2 SiMe 2 CH 2 (CH 2 CH 2 O) 4 Me) 2 ) 4 (7) towards alkali metal ions is described. ESI-TOF studies reveal that in 4 one, in 5 two and in 7 up to four metal ions can be trapped, which enables 4, 5 and 7 as possible ionophores for chemical sensors.