Electronic structure of low-spin ferric chlorins: characterization of bis(1-methylimidazole)(meso-tetraphenylchlorinato)iron(iii) triflate

NMR and EPR Studies of Chloroiron(III) Tetraphenyl-chlorin and Its Complexes with Imidazoles and Pyridines of Widely Differing Basicities

“…[1][2][3][4][5][6][7][8][9][10][11][12] There have been a number of previous studies of synthetic and natural iron chlorin and/or isobacteriochlorin complexes by magnetic resonance techniques, including the seminal paper of Stolzenberg, Strauss and Holm in 1981 13 and additional papers from these authors, 14-18 as well as other researchers. [19][20][21][22][23][24][25][26][27][28][29][30][31] Understanding the electronic properties of the iron(III) complexes of each of the individual "green" hemes is an important step in understanding their mechanisms of action.…”

13C NMR Studies of the Electronic Structure of Low-Spin Iron(III) Tetraphenylchlorin Complexes

“…These complexes have been reported to adopt the (d xy ) 2 (d xz , d yz ) 3 ground state on the basis of the 1 H NMR and EPR spectroscopy as well as X-ray crystallography. 18,20…”

“…Synthesis. Free base TPC, 39 Fe(TPC)Cl, 40 Fe(TPC)(CF 3 SO 3 ), 19 [Fe(TPC)(1-MeIm) 2 ]Cl, 20 and [Fe(TPC)( t BuNC) 2 ](CF 3 SO 3 ) 19 were prepared as described previously.…”

“…Since the reference paper reported by Holm and coworkers in 1981, 17 many investigations of the NMR and EPR spectra of low-spin iron(III) complexes of reduced porphyrins have been published very recently, 18 by us [19][20][21][22] and others. 15,[23][24][25][26][27][28][29][30][31][32] The nature of the electronic ground state is not always clear, and more information is needed with these systems.…”

14 Iron, cobalt and nickel

“…98 Spectroscopic studies on [Fe(meso-tetraphenylchlorin)(1-methylimidazole) 2 ] OTf indicate the presence of a metal-based electron in d π orbitals, and that the electron configuration (d xy , d yz ) 4 (d xy ) 1 is possible for both ferric porphyrins and chlorins. 99 [Fe(tpp)(OTf )] acts as a Lewis acid catalyst for the selective rearrangement of α,β-epoxy ketones into 1,2-diketones. 100 Solvatochemical reaction between [FeCp 2 ] and H 2 TpyP leads to layered structures of [Fe(TPyP)] with two-dimensional paddlewheel structures.…”