A small cavity with reactive internal shell atoms spanned by four {As(W/V)(9)}-type building blocks allows host-guest chemistry under confined conditions

Müller A, Pope MT, Merca A, Bögge H, Schmidtmann M, van Slageren J, Dressel M, Kurth DG (2005)
Chemistry - a European Journal 11(20): 5849-5854.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Abstract / Bemerkung
The reaction of [H2AsIII-W18O60](7-) with VO2+ and SO42- ions in aqueous solution leads to a V-IV/V-V mixed-valence cluster anion containing the {AS(4)M(40)O(140)}-type cryptand which has a high formation tendency. An important result is that it exhibits a new type of reactive internal cavity shell. The correspondingly obtained compound Na(NH4)(20)[{((VO)-O-IV(H2O))((VVO)-V-IV)(2)- (SO4)(2)}{((AsW9O33)-W-III)(2)((AsW7.5V1.5O31)-W-III-O-V)(2)-(WO2)(4)}]- 40H(2)O (1), which can also be synthesized from a precursor with the preorganized cryptand, was characterized by elemental and thermogravimetric analyses (determination of crystal water content), redox titrations (determination of the number of V-IV centers), electronic absorption as well as vibrational spectra, single-crystal X-ray structure analysis (including bond valence sum calculations), and magnetic susceptibility measurements. The relatively small central cavity-formed by the linking of four {AsM9}-type lacunary units (M=W/V) by four WO6 octahedra-allows positioning of a variety of cationic as well as anionic "guests" under confined conditions according to a new approach: replacement of some of the W by V atoms leads to high reactivity of the internal cavity shell as a result of relatively weak VO bonds compared to the WO bonds. This allows an interesting "encapsulation chemistry" with new options. In the present case the cavity contains besides an arrangement of three V-IV centers, two sulfate groups that replace O atoms of the {AsM9} units as well as an interesting hydrogen bond situation.
Stichworte
cryptand; poly-oxometalates; magnetism; encapsulation chemistry; vanadium; tungsten
Erscheinungsjahr
2005
Zeitschriftentitel
Chemistry - a European Journal
Band
11
Ausgabe
20
Seite(n)
5849-5854
ISSN
0947-6539
eISSN
1521-3765
Page URI
https://pub.uni-bielefeld.de/record/1601989

Zitieren

Müller A, Pope MT, Merca A, et al. A small cavity with reactive internal shell atoms spanned by four {As(W/V)(9)}-type building blocks allows host-guest chemistry under confined conditions. Chemistry - a European Journal. 2005;11(20):5849-5854.
Müller, A., Pope, M. T., Merca, A., Bögge, H., Schmidtmann, M., van Slageren, J., Dressel, M., et al. (2005). A small cavity with reactive internal shell atoms spanned by four {As(W/V)(9)}-type building blocks allows host-guest chemistry under confined conditions. Chemistry - a European Journal, 11(20), 5849-5854. doi:10.1002/chem.200500284
Müller, A., Pope, M. T., Merca, A., Bögge, H., Schmidtmann, M., van Slageren, J., Dressel, M., and Kurth, D. G. (2005). A small cavity with reactive internal shell atoms spanned by four {As(W/V)(9)}-type building blocks allows host-guest chemistry under confined conditions. Chemistry - a European Journal 11, 5849-5854.
Müller, A., et al., 2005. A small cavity with reactive internal shell atoms spanned by four {As(W/V)(9)}-type building blocks allows host-guest chemistry under confined conditions. Chemistry - a European Journal, 11(20), p 5849-5854.
A. Müller, et al., “A small cavity with reactive internal shell atoms spanned by four {As(W/V)(9)}-type building blocks allows host-guest chemistry under confined conditions”, Chemistry - a European Journal, vol. 11, 2005, pp. 5849-5854.
Müller, A., Pope, M.T., Merca, A., Bögge, H., Schmidtmann, M., van Slageren, J., Dressel, M., Kurth, D.G.: A small cavity with reactive internal shell atoms spanned by four {As(W/V)(9)}-type building blocks allows host-guest chemistry under confined conditions. Chemistry - a European Journal. 11, 5849-5854 (2005).
Müller, Achim, Pope, MT, Merca, Alice, Bögge, Hartmut, Schmidtmann, Marc, van Slageren, Joris, Dressel, M., and Kurth, D. G. “A small cavity with reactive internal shell atoms spanned by four {As(W/V)(9)}-type building blocks allows host-guest chemistry under confined conditions”. Chemistry - a European Journal 11.20 (2005): 5849-5854.

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