A double-helical metal complex of an oligopyridine analog (i.e. with h
eterocycles other than pyridinyl rings) has been fully structurally ch
aracterized. This complex is the first example of a trinuclear double-
helical complex containing quinquedentate and monodentate ligands and
is of a type that has not been observed with the oligopyridines. In th
e rhetoric of metallosupramolecular chemistry much is said about the '
'design'' of complexes of specific structure. Our work invites molecul
ar engineers to consider pyrazolyl ligands as useful additions to thei
r ''tool kit''.