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A Tunable Coordination Response of the Phosphorus‐Based Hexadentate Ligand (S)P[N(Me)N=CHC 6 H 4 ‐ o ‐OH] 3 (LH 3 ): Synthesis and Structure of LM (M = Sc, Cr, Mn, Fe, Co, Ga)
Author(s) -
Chandrasekhar Vadapalli,
Azhakar Ramachandran,
Pandian Balasubramanian Murugesa,
Bickley Jamie F.,
Steiner Alexander
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200700961
Subject(s) - chemistry , crystallography , ligand (biochemistry) , crystal structure , chirality (physics) , octahedron , denticity , metal , supramolecular chemistry , intermolecular force , coordination complex , stereochemistry , coordination sphere , metal ions in aqueous solution , molecule , receptor , biochemistry , chiral symmetry breaking , physics , organic chemistry , quantum mechanics , nambu–jona lasinio model , quark
The multidentate ligand (S)P[N(Me)N=CHC 6 H 4 ‐ o ‐OH] 3 (LH 3 ) reacts with a number of M III salts to afford the neutral mononuclear complexes LM (M = Sc, Cr, Mn, Fe, Co and Ga). The coordination behaviour of the ligand is hexadentate in all of these complexes, where it encapsulates the metal ion in a facial 3N,3O coordination mode. All the metal complexes have been characterised by spectroscopic and X‐ray crystallographic methods. The metal atoms in the complexes LSc, LMn, LFe and LGa adopt a distorted octahedral geometry, whereas the geometries of LCr and LCo are more ideal. The electrochemical behaviour of LMn shows that it can be reversibly reduced ( E 1/2 = –0.13 V) in a single electron process. The achiral ligand LH 3 induces chirality in the metal complexes LM upon coordination with the metal ion. All the complexes crystallise as racemic compounds where both the clockwise (Δ) and anticlockwise (Λ) enantiomorphs are present in the crystal structure in an ordered arrangement. Furthermore, all complexes show supramolecular chiral recognition in their crystal structures; the Δ form recognizes the Λ form by means of intermolecular C–H ··· O and C–H ··· S interactions.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)