Light Modulated Host-guest Recognition of Organic Modified Polyoxometalate Complex†

doi:10.7503/cjcu20150637

Abstract

Abstract:

By ion exchange method, we realized the counter ion substitution and phase transfer of an azobenzene covalently modified Anderson polyoxometalate. The photoisomerization behavior of the prepared complex was investigated through ¹H NMR and UV-Vis spectra in the aqueous solution. Base on the above results, we studied the inclusion interactions between the organic modified polyoxometalate and cyclodextrin in the aqueous solution, and realized the reversible recognition and dissociation between hybrid supramolecular guest and cyclodextrin with irradiations by various wavelengths.

Key words: Anderson-type polyoxometalate, Azobenzene covalent decoration, Cyclodextrin, Host-guest recognition, Light modulation

CLC Number:

O648

TrendMD:

AI Hui, LI Wen, ZHANG Bin, LI Bao, WU Lixin. Light Modulated Host-guest Recognition of Organic Modified Polyoxometalate Complex^†[J]. Chem. J. Chinese Universities, 2015, 36(11): 2297.

Figures/Tables 10

Fig.1 Anionic structure of the azo-modified POM and its photo-induced recognition and dissociation process with β-CD The azo-modified POM was synthesized by post-functionalization method.

Fig.2 1H NMR spectra of complexes 1(a) and 2(b) in DMSO-d6

Fig.3 FTIR spectra of complexes 1(a) and 2(b)

Fig.4 1H NMR spectra of complex 2 in D2O before(a) and after UV(b) and visible light(c) showing trans/cis transformation

Fig.5 UV-Vis spectra of complex 2 in aqueous solution Inset: cycle numbers of alternating UV and visible light irradiation.

Fig.6 1H NMR spectra of complex 2, β-CD, and complex 2 mixed with β-CD in D2O(A) and the enlarged spectra of complex 2 and after mixed with β-CD(B) a. Complex 2; b. complex 2+ β-CD; c. β-CD.

Fig.7 1H NMR spectra of complex 2 mixed with β-CD in D2O before(a) and after UV(b) and visible light(c) irradiation

Fig.8 UV-Vis spectra of complex 2 in aqueous solution Inset is three cycles of alternating UV and visible light irradiation.

Fig.9 1H NOESY spectrum of mixed complex 2 and β-CD(mole ratio 1:2) in D2O after UV light irradiation

Fig.10 1H NOESY spectrum of mixed complex 2 and β-CD(mole ratio 1:2) in D2O after visible light irradiation

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