TY - JOUR
T1 - A series of heteroleptic complexes of the type fac-[MnIIIL2]- [H2L=derivatives of N-(2-hydroxybenzyl)glycine or N-(5-nitro-2-hydroxybenzyl)sarcosine] possessing unusual Mn(III) co-ordination spheres
AU - Shongwe, Musa S.
AU - Mikuriya, Masahiro
AU - Nukada, Ryoji
AU - Ainscough, Eric W.
AU - Brodie, Andrew M.
AU - Waters, Joyce M.
N1 - Funding Information:
We thank the Japan Society for the Promotion of Science (M.S.S.), the South African Foundation for Research Development (M.S.S.), the Centre for Molecular Design, Witwatersrand University (M.S.S.) and the New Zealand Lottery Grants Board (E.W.A. and A.M.B.) for financial support. We also wish to express our appreciation to J. Allen, Horticultural and Food Research Institute of New Zealand Ltd., for recording the mass spectra.
PY - 1999/7/15
Y1 - 1999/7/15
N2 - The mononuclear manganese(III) complexes [C5H10NH2][MnL2] [L2-=a substituted N-(2-hydroxybenzyl)glycinate (hbg2-) viz. 3,5-dibromo- (3,5-Br-hbg2-), 3,5-dichloro- (3,5-Cl-hbg2-), 3-methyl-5-chloro- (3,5-Me,Cl-hbg2-), 5-bromo- (5-Br-hbg2-), 5-chloro- (5-Cl-hbg2-), 5-nitro- (5-NO2-hbg2-) or N-(5-nitro-2-hydroxybenzyl)sarcosine (5-NO2-hbs2-)] have been synthesised by reaction of the appropriate ligand with manganese(II) perchlorate under ambient conditions in a 2:1 molar ratio using piperidine as base. The structures of three of these complexes, [C5H10NH2][Mn(3,5-Cl-hbg)2] (2), [C5H10NH2][Mn(5-NO2-hbg) 2] (6) and [C5H10NH2][Mn(5-NO2-hbs) 2] (7) have been elucidated by single-crystal X-ray crystallography and each displays two similar, independent [MnL2]- ions in the asymmetric unit linked via piperidinium cations through hydrogen bonding. The ligands co-ordinate in a facial tridentate fashion with the three donor atoms being the phenolate and carboxylate oxygens and the amine nitrogen. The geometry at the Mn centres is compressed rhombic octahedral consistent with a pseudo-Jahn-Teller compression along the Mn-O(phenolate) axis. Mean bond lengths are in the ranges 1.886-1.889 Å for the Mn-O(phenolate), 2.062-2.125 Å for the Mn-O(carboxylate) and 2.091-2.184 Å for the Mn-N(amine) distances. The magnetic susceptibility and electronic and IR spectroscopic data are discussed with reference to the crystal structures.
AB - The mononuclear manganese(III) complexes [C5H10NH2][MnL2] [L2-=a substituted N-(2-hydroxybenzyl)glycinate (hbg2-) viz. 3,5-dibromo- (3,5-Br-hbg2-), 3,5-dichloro- (3,5-Cl-hbg2-), 3-methyl-5-chloro- (3,5-Me,Cl-hbg2-), 5-bromo- (5-Br-hbg2-), 5-chloro- (5-Cl-hbg2-), 5-nitro- (5-NO2-hbg2-) or N-(5-nitro-2-hydroxybenzyl)sarcosine (5-NO2-hbs2-)] have been synthesised by reaction of the appropriate ligand with manganese(II) perchlorate under ambient conditions in a 2:1 molar ratio using piperidine as base. The structures of three of these complexes, [C5H10NH2][Mn(3,5-Cl-hbg)2] (2), [C5H10NH2][Mn(5-NO2-hbg) 2] (6) and [C5H10NH2][Mn(5-NO2-hbs) 2] (7) have been elucidated by single-crystal X-ray crystallography and each displays two similar, independent [MnL2]- ions in the asymmetric unit linked via piperidinium cations through hydrogen bonding. The ligands co-ordinate in a facial tridentate fashion with the three donor atoms being the phenolate and carboxylate oxygens and the amine nitrogen. The geometry at the Mn centres is compressed rhombic octahedral consistent with a pseudo-Jahn-Teller compression along the Mn-O(phenolate) axis. Mean bond lengths are in the ranges 1.886-1.889 Å for the Mn-O(phenolate), 2.062-2.125 Å for the Mn-O(carboxylate) and 2.091-2.184 Å for the Mn-N(amine) distances. The magnetic susceptibility and electronic and IR spectroscopic data are discussed with reference to the crystal structures.
KW - Crystal structures
KW - Glycine derivative complexes
KW - Manganese complexes
KW - Sarcosine derivative complexes
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U2 - 10.1016/S0020-1693(99)00139-5
DO - 10.1016/S0020-1693(99)00139-5
M3 - Article
AN - SCOPUS:0000797384
SN - 0020-1693
VL - 290
SP - 228
EP - 236
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 2
ER -