Journal
DALTON TRANSACTIONS
Volume 44, Issue 44, Pages 19090-19096Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5dt03617h
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Funding
- AGSO
- EPSRC
- Woolf Fisher Trust
- ERC (Advanced Investigator Grant)
- Engineering and Physical Sciences Research Council [1235135, EP/F00253X/1] Funding Source: researchfish
- EPSRC [EP/F00253X/1] Funding Source: UKRI
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The novel heterometallic polyoxotitanate cage [Ti18MnO30(OEt)(20)(MnPhen)(3)] (1), obtained by solvothermal reaction of Ti(OEt)(4) with Mn(AcO)(3)center dot(H2O)(2) and 1,10-phenanthroline (Phen) in EtOH, has a C-3 symmetric core structure containing an interstitial tetrahedral MnII ion and is surrounded by three MnII(Phen) fragments. The molecular structure is retained in thin film electrodes of 1 deposited by solution drop-casting onto fluorinated tin oxide (FTO). Both solid state and solution phase electrochemical measurements show dual redox couples, consistent with the two distinct Mn coordination environments in the cage structure. Sintering of 1 in air at 600 degrees C produces a black crystalline solid which consists of Mn-doped TiO2 (mainly in the rutile phase) together with alpha-Mn2O3. Such a composite semiconductor has an optical band gap of ca. 1.80 eV, similar to that of alpha-Mn2O3.
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