Pt/Pd–Ethynyl Bond Containing Fluorescent Molecular Architectures as Sensors for Nitroaromatics - Molecular Self-Assembly: Advances and Applications - page 279

9.3.3.2 Synthesis and Characterization of Molecular Prism
From Pt II 3 Acceptor 19
The acceptor 19 was treated with 1.5 equivalents of the clip 20 in

°

acetone at 50 C overnight to yield the yellow fluorescent precipitate

of the cage 21 . Expected upfield shift of the phosphorus peak of 19

upon reaction with 20 was observed. Similarly, the H , H , and H α β

9

protons of the donor ligand showed the expected downfield shifts
(Fig. 9.14). Multinuclear NMR spectroscopy provided an indication
about the metal-ligand bonding and the formation of a single
product. However, it does not provide much information about the
shape of this kind of products and the actual composition.

1

Figure 9.14 H NMR spectra of 21 in CDCl . 3

The proposed structure of the molecular prism 21 obtained by

energy minimization is presented in Fig. 9.15.

Figure 9.15 Proposed view of the optimized structure of . Ethyl groups

are omitted for the sake of clarity. Color codes: green = Pt;
pink = P; blue = N [22].

21