inorganic chemistry

In a further step, Yam and coworkers constructed helical
superstructures employing chiral alkynylplatinum(II)–terpyridyl
complexes, obtaining metallogels that show helical fibrous
nanostructures. The chiral supramolecular structure and the
spectroscopic properties depend on the extent of aggregation
through PtPt andp–pinteractions, which can be influenced
by varying the nature of counteranions, as revealed by UV/vis,
circular dichroism, and luminescence studies( 221 ).

RR

X–

+

N

N

N Pt

R′

1 mm1mm

1 mm 10 mm

R′

FIG. 25. General structure of gelating terpyridine-based Pt(II)
gelators described by Yamet al. TEM (left) and SEM (right) images of
selected xerogels prepared from a DMSO gel (top), and a benzene gel
(bottom). Reproduced with the permission of the American Chemical
Society ( 220 ).

PHOTOPHYSICS OF MOLECULAR ASSEMBLIES 89