Chapter 4 - Jacobs University

Chapter 9
Unpublished Results
coordination numbers and geometries of three types of Cu are different from each other and the
octahedral Cu exhibits Jahn–Teller distortion with axial elongation. We also performed TGA
measurements on 6a from room temperature to 900 °C in order to confirm the number of crystal
waters (Figure 9.2).
Figure 9.3 Polyhedral/ball and stick type structural representation of 6. Color scheme Cu, P and WO 6
units are shown by turquoise, blue and red respectively.
9.1.1.2 Solution NMR
We also investigated the solution properties of 6a by 31 P NMR spectroscopy at room temperature
in D 2 O (400 MHz; JEOL ECX instrument). We observed a singlet at d = -29.2 ppm indicating
that all eight phosphorus atoms in 6a are equivalent, which is in complete agreement with the
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