Avoiding cross-linking in iron-polyphosphazene metallo-polymers

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Highlights

  • Two bidentate donors are attached in a geminal fashion to the phosphorus atom in the polymer chain.

  • When iron coordinates, cross-linking between polymer chains is avoided.

  • Mössbauer and electronic absorbance spectroscopies are used to establish iron coordination.

Abstract

Two new polyphosphazene ligands containing 1,10-phenanthrolin-2-olate (L1) and 2,2ʹ-bipyridine-6-olate moieties (L2) with 5,5ʹ-di-tert-butylbiphenyl-2,2ʹ-bis(olate) co-substituents were synthesised and then reacted with Fe(Pyridine)4(NCS)2. Variable temperature Mössbauer and electronic absorbance spectroscopies were used to establish the physical behaviour of the new iron-polyphosphazenes. By attaching two bidentate ligands to a geminal phosphorus atom a pseudo tetradentate ligand can be formed that prevents cross-linking when iron is coordinated to the polyphosphazene.

Graphical abstract

Cross-linking in metallo-polyphosphazenes can be prevented by attaching two bidentate donors in a geminal fashion to the phosphorus atoms in the polymer chain.

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Acknowledgements

We thank the Massey University Research Fund for financial support and a PhD Scholarship (to R.J.D.). We also thank Associate Professor S.G. Telfer and the MacDiarmid Institute for Advanced Materials and Nanotechnology for the use of the Spider Diffractometer, Professor K.C. Gordon and Dr R. Horvath (The University of Otago) for Resonance Raman data and G. Weal (The University of Otago) for help in collecting Mössbauer data.

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