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Title: Vanadyl sulfates: molecular structure, magnetism and electrochemical activity
Authors: Ignaszak, Anna
Patterson, Nigel
Radtke, Mariusz
Elsegood, Mark R.J.
Frese, Josef W.A.
Lipman, Joah L.
Yamato, Takehiko
Sanz, Sergio
Brechin, Euan K.
Prior, Timothy J.
Redshaw, Carl
Issue Date: 2018
Publisher: © The Royal Society of Chemistry
Citation: IGNASZAK, A. ... et al, 2018. Vanadyl sulfates: molecular structure, magnetism and electrochemical activity. Dalton Transactions, doi:10.1039/C8DT03626H.
Abstract: Reaction of differing amounts of vanadyl sulfate with p-tert-butylthiacalix[4]areneH4 and base allows access to the vanadyl-sulfate species [NEt4]4[(VO)4(μ3-OH)4(SO4)4]·½H2O (1), [HNEt3]5[(VO)5(μ3-O)4(SO4)4]·4MeCN (2·4MeCN) and [NEt4]2[(VO)6(O)2(SO4)4(OMe)(OH2)]·MeCN (3·MeCN). Similar use of p-tert-butylsulfonylcalix[4]areneH4, p-tert-butylcalix[8]areneH8 or p-tert-butylhexahomotrioxacalix[3]areneH3 led to the isolation of [HNEt3]2[H2NEt2]2{[VO(OMe)]2p-tert-butylcalix[8-SO2]areneH2} (4), [HNEt3]2[V(O)2p-tert-butylcalix[8]areneH5] (5) and [HNEt3]2[VIV2VV4O11(OMe)8] (6), respectively. Dc magnetic susceptibility measurements were performed on powdered microcrystalline samples of 1–3 in the T = 300–2 K temperature range. Preliminary screening for electrochemical water oxidation revealed some activity for 2 with turnover frequency (TOF) and number (TON) of 2.2 × 10−4 s−1 and 6.44 × 10−6 (mmol O2/mmol cat.), respectively. The compound 3 showed an improved electrochemical activity in the presence of water. This is related to the increased number and the rate of electrons exchanged during oxidation of V4+ species, facilitated by protons generated in the water discharge process.
Description: This paper is closed access until 22 October 2019.
Sponsor: The EPSRC is thanked for an Overseas Travel Grant (to CR). EKB thanks the EPSRC for funding grants EP/N01331X/1 and EP/P025986/1.
Version: Accepted for publication
DOI: 10.1039/c8dt03626h
URI: https://dspace.lboro.ac.uk/2134/35655
Publisher Link: https://doi.org/10.1039/c8dt03626h
ISSN: 1477-9226
Appears in Collections:Closed Access (Chemistry)

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