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Rh(III) complexes of singly and doubly reduced phthalocyanine ligands generated by chemical and electrochemical reduction†

✍ Scribed by M. J. Chen; R. J. Klingler; J. W. Rathke


Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
133 KB
Volume
05
Category
Article
ISSN
1088-4246

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✦ Synopsis


The paramagnetic complexes ( FPc )( Me ) Rh ^-^ (4) and (FPc)( PMe ~3~)( Me ) Rh ^-^ (10) have been prepared by reducing ( FPc )( Me ) Rh (1) and ( FPc )( PMe ~3~)( Me ) Rh (2) with NaBH ~4~ in methanol-d~4~ [ FPc ^2-^ = dianion of 1,4,8,11,15,18,22,25-octakis(trifluoromethyl)phthalocyanine]. Compounds 4 and 10 are further reduced by NaBH ~4~ to complexes, which are assigned to ( DFPc )( Me ) Rh ^-^ (5) and ( DFPc )( PMe ~3~)( Me ) Rh ^-^ (11), respectively. Based on the ^1^ H NMR spectra of these complexes, 4 and 10 are assigned to the Rh (III) complexes of the singly reduced radical anion FPc ^·3-^, while 5 and 11 are assigned to the Rh (III) complexes of the doubly reduced, antiaromatic anion DFPc ^3-^, which has the deuteron bonded to one of its meso nitrogens. As expected, the antiaromatic complexes 5 and 11 are not stable. At -40 °C, 5 was transformed successively into three aromatic compounds, the first of which was assigned to the ring-contracted α,β,γ-triazatetrabenzocorrole complex ( TBC )( Me ) Rh ^-^ [ TBC ^3-^ = trianion of 3,6,10,13,17,20,24,27-octakis(trifluoromethyl)-α,β,γ-triazatetrabenzocorrole]. Cyclic voltammetry of 1 and 2 was also carried out. Two reversible one-electron reduction waves were observed for both 1 and 2.


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