Pt/Pd–Ethynyl Bond Containing Fluorescent Molecular Architectures as Sensors for Nitroaromatics - Molecular Self-Assembly: Advances and Applications - page 272

9.3.1 Self-Assembly of Trigonal Prisms

A general concept that one can imagine for the design of a trigonal
prism is to use two tritopic donors, six 90 corners, and three linear

linkers by a [2 + 6 + 3] self-assembly reaction (Scheme 9.7). However,
the main drawback of a three-component self-assembly is the lack of
selectivity in the formation of the products and generally a mixture
of products is produced. Although a few examples of the formation of
such assemblies by the judicious insertion of appropriate template
is known, such syntheses are not selective in the absence of template
and thus are discouraged.

°

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Scheme 9.7 Possible supramolecular structures from 90 acceptor, linear

ditopic donor, and tritopic linkers.

As the multicomponent self-assembly approach is unpredictable,
we have used two-component self-assembly approach to design
trigonal prism. Syntheses of nanoscopic prisms were

achieved by reacting the tridentate planar organometallic acceptor
14

17 and 18

with the clip-type amide containing ligand 1,3-bis(3-pyridyl)
isophthalic amide

15 and ditopic donor 1,3-bis(3-pyridylethynyl)

benzene 16 , respectively. The carbon-centered Pt acceptor 19

3

was assembled with the rigid organic clip 20 to obtain the cage 21

(Scheme 9.8).