Tetracoordinated Manganese(III) Alkylcorrolates. Spectroscopic Studies and the Crystal and Molecular Structure of (7,13-Dimethyl-2,3,8,12,17,18-hexaethylcorrolato)manganese(III)

Silvia Licoccia; Elisabetta Morgante; Roberto Paolesse; Francesca Polizio; Mathias O. Senge; Eugenio Tondello; Tristano Boschi

doi:10.1021/ic960334i

Tetracoordinated Manganese(III) Alkylcorrolates. Spectroscopic Studies and the Crystal and Molecular Structure of (7,13-Dimethyl-2,3,8,12,17,18-hexaethylcorrolato)manganese(III)

Inorg Chem. 1997 Apr 9;36(8):1564-1570. doi: 10.1021/ic960334i.

Authors

Silvia Licoccia¹, Elisabetta Morgante, Roberto Paolesse, Francesca Polizio, Mathias O. Senge, Eugenio Tondello, Tristano Boschi

Affiliation

¹ Dipartimento di Scienze e Tecnologie Chimiche and Dipartimento di Biologia, Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy, Institut für Organische Chemie (WE02), Freie Universität, Takustrasse 3, D-14195 Berlin, Germany, and Dipartimento di Chimica Inorganica, Metallorganica ed Analitica, Università di Padova, Via Loredan 4, 35131 Padua, Italy.

PMID: 11669743
DOI: 10.1021/ic960334i

Abstract

(2,3,7,8,12,13,17,18-Octamethylcorrolato)manganese(III), [Mn(OMC)], has been characterized by several physical measurements. In the presence of nitrogenous bases the complex exists as a valence tautomer [Mn(II)(OMC(*+))] as demonstrated by (1)H NMR and EPR. Complete resonance assignment in the NMR spectrum has been achieved by systematic substitution of the peripheral substituents. The crystal structure of the first example of a tetracoordinated tetrapyrrolic macrocycle Mn(III) complex, (7,13-dimethyl-2,3,8,12,17,18-hexamethylcorrolato)manganese(III), [Mn-7,13-Me(2)-HEC)], is also reported. Crystal data with Cu Kalpha (lambda = 1.541 78 Å) at 293 K are as follows: C(33)H(39)MnN(4), a = 4.671(2) Å, b = 28.31(2) Å, c = 20.882(6) Å, beta = 94.60(3) degrees, V = 2753(2) Å(3), Z = 4, monoclinic, space group P2(1)/n, 4088 data, R1 = 0.0563 for 4088 observed reflections with I > 2sigma(I). The analysis reveals a high degree of planarity of the macrocycle and the existence of strong overlap between the pi systems with the formation of an infinite stack of molecules.