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Metal Complexes with Tetrapyrrole Ligands, XXXVIII. On the Knowledge of Alkyl- and Arylimidovanadium(IV) Porphyrins
Buchler, Johann W.,Pfeifer, Stefan
, p. 1362 - 1370 (2007/10/02)
A series of novel alkyl or arylimidovanadium(IV) 5,10,15,20-tetra(p-tolyl)porphyrinates, VNR(TTP) (4a - 4g), is described.They are obtained from the vanadyl complex, VO(TTP) (2a) via the reactive intermediate VCl2(TTP) (3b) which undergoes aminolysis with the respective primary amines RNH2 (R = tBu, Ph, pTol, pClPh, pAnis, pBiph, ptBuPh).The formulae are proved by elemental analyses and mass spectra.The paramagnetic complexes are stable to water and may thus be purified by chromatography but are hydrolyzed to give 2a on treatment with acetic acid.The UV/VIS and 1H NMR spectra of 4a - 4g are of the same type as 2a, but the former are slightly hypsochromically shifted, and the latter do not show the proton resonances of the organylimide ligands due to the proximity of the paramagnetic metal center. - Key words: Imidovanadium(IV) Porphyrins, Vanadium Porphyrins, Titanium Porphyrins
