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Iron pyrrole‐based PNP pincer ligand complexes as catalyst precursors
Author(s) -
Holland Amanda M.,
Oliver Allen G.,
Iluc Vlad M.
Publication year - 2017
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229617009287
Subject(s) - pincer movement , catalysis , pyrrole , pincer ligand , ligand (biochemistry) , chemistry , combinatorial chemistry , polymer chemistry , organic chemistry , biochemistry , receptor
The structure of a pincer ligand consists of a backbone and two `arms' which typically contain a P or N atom. They are tridentate ligands that coordinate to a metal center in a meridional configuration. A series of three iron complexes containing the pyrrole‐based PNP pincer ligand 2,5‐bis[(diisopropylphosphanyl)methyl]pyrrolide (PN pyr P) has been synthesized. These complexes are possible precursors to new iron catalysts. {2,5‐Bis[(diisopropylphosphanyl)methyl]pyrrolido‐κ 3 P , N , P ′}carbonylchlorido(trimethylphosphane‐κ P )iron(II), [Fe(C 18 H 34 NP 2 )Cl(C 3 H 9 P)(CO)] or [Fe(PN pyr P)Cl(PMe 3 )(CO)], (I), has a slightly distorted octahedral geometry, with the Cl and CO ligands occupying the apical positions. {2,5‐Bis[(diisopropylphosphanyl)methyl]pyrrolido‐κ 3 P , N , P ′}chlorido(pyridine‐κ N )iron(II), [Fe(C 18 H 34 NP 2 )Cl(C 5 H 5 N)] or [Fe(PN pyr P)Cl(py)] (py is pyridine), (II), is a five‐coordinate square‐pyramidal complex, with the pyridine ligand in the apical position. {2,5‐Bis[(diisopropylphosphanyl)methyl]pyrrolido‐κ 3 P , N , P ′}dicarbonylchloridoiron(II), [Fe(C 18 H 34 NP 2 )Cl(CO) 2 ] or [Fe(PN pyr P)Cl(CO) 2 ], (III), is structurally similar to (I), but with the PMe 3 ligand replaced by a second carbonyl ligand from the reaction of (II) with CO. The two carbonyl ligands are in a cis configuration, and there is positional disorder of the chloride and trans carbonyl ligands.