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. 2017 Feb 28;53(18):2756-2759.
doi: 10.1039/c6cc10328f.

Self-assembly of cucurbit[7]uril based triangular [4]molecular necklaces and their fluorescence properties

Soumen K Samanta  1 , Kimberly G Brady  1 , Lyle Isaacs  1
Affiliations

Self-assembly of cucurbit[7]uril based triangular [4]molecular necklaces and their fluorescence properties

Soumen K Samanta et al. Chem Commun (Camb). .

Abstract

Self-assembly of rigid-rod dipyridine ligand 1 with M(en)(NO3)2 (M = Pd, Pt) affords triangular (3, 5) and square (4, 6) supramolecular coordination complexes (SCCs). The binding affinity of 1 toward CB[n]-type containers results in the formation of triangular [4]molecular necklaces ([4]MNs, 7-10) by either one-pot or post complexation approaches as evidenced by 1H NMR, diffusion ordered spectroscopy, and ESI-MS.

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Figures

Fig. 1
Fig. 1
Complexation of 1 with CB[7] and CB[8].
Fig. 2
Fig. 2
1H NMR recorded (400 MHz, D2O, RT) for a) 1 (0.3 mM) and b-g) with various equiv. of CB[7] ‒ b) 1.0, c) 1.25, d) 1.50, e) 1.75, f) 2.0, g) 3.0.
Fig. 3
Fig. 3
Synthesis of [4]MNs from 1 with Pd(en)(NO3)2 and Pt(en)(NO3)2 to afford mixture of triangle and square. Using CB[7] or M2 give [4]MNs or pseudo [4]MNs in water.
Fig. 4
Fig. 4
Partial 1H NMR (D2O, 600 MHz) recorded for a) 1, b) 3, c) 5, d) [4]MN 7, and e) [4]MN 8.
Chart 1
Chart 1
Molecular structures of compounds used in this study.
See this image and copyright information in PMC

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