Abstract: The synthesis and binding properties of two types of amine-containing, cytosine- based ditopic receptors, 4-amino-1-[4-[N, N-bis [2-(N, N-diethylamino) ethyl] amino~ butyl]-2 (1H)-pyrimidinone (1) and 4-amino-l-[4-(N, N-diethyl-amino) butyl]-2 (1 H)-pyrimidinone (Za), 4-amino-1-[5-(N, N-diethylamino) pentyl1-2 (1H) pyrimidinone (Zb), and 4-amino-1-[6-(N, N- diethylamino) hexyl1-2 (lH)-pyrimidinone (k), are described. These systems were ...