A TRINUCLEAR DOUBLE-HELICAL METAL-COMPLEX OF A QUINQUEPYRIDINE ANALOG

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''.