(5-Fluoro-2,6-dioxo-1,2,3,6-tetra-hydro-pyrimidin-1-ido-κN (1))(1,4,8,11-tetra-aza-cyclo-tetra-decane-κ(4) N)zinc(II) perchlorate.

In the structure of the title complex, [Zn(C(4)H(2)FN(2)O(2))(C(10)H(24)N(4))]ClO(4), the zinc(II) ion forms coordination bonds with the four nitro-gen atoms of cyclam (1,4,8,11-tetra-aza-cyclo-tetra-decane or [14]aneN4) as well as with the nitro-gen atom of a deprotonated 5-fluoro-uracil ion (FU(-)). Cyclam adopts a trans-I type conformation within this structure. The coordination structure of the zinc(II) ion is a square pyramid with a distorted base plane formed by the four nitro-gen atoms of the cyclam. FU(-) engages in inter-molecular hydrogen bonding with neighboring FU(-) mol-ecules and with the cyclam mol-ecule.