2,2′:6′,2″-Terpyridine and bis(2,2′:6′,2″-terpyridine)ruthenium(II) complex on the dendritic periphery

2,2′:6′,2″-Terpyridine end-functionalized dendrimers were prepared utilizing chlorinated siloxane dendrimer and 6-hydroxyhexa-4′-(2,2′:6′,2″-terpyridine) ether. The terpyridine groups on dendrimers accepted the ruthenium chloride ions on the mild condition that produced the paramagnetic ruthenium complex Gn-mTPY-RuCl3. The continual addition of 2,2′:6′,2″-terpyridine to the ruthenium–terpyridine complex on the dendritic periphery progressed to bis(2,2′:6′,2″-terpyridine)ruthenium(II) complex Gn-m[TPY-Ru-TPY] (n=1, m=4; n=2, m=8; n=3, m=16) which revealed diamagnetic property.