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The heteroditopic ligand 4`-(4,7,10-trioxadec-1-yn-10-yl)- 2,2`:6`,2 ``-terpyridine, 2, contains an N, N`, N ``-donor metal-binding domain that recognizes iron(II), and a terminal alkyne site that selectively couples to platinum( II). This selectivity has been used to investigate routes to the formation of heterometallic systems. The single crystal structures of ligand 2 and the complex [Fe(2)(2)][PF6](2) are reported.