1391920-74-3Relevant academic research and scientific papers
Diastereoselectivity in dinuclear complexes of chiral tridentate ligands
Jena, Himanshu Sekhar,Manivannan, Vadivelu
, p. 154 - 162 (2012)
Using a racemic mixture of two chiral tridentate ligands 2-((1-(2-pyridyl)ethylimino)methyl)phenolate ion (L1) and 2-((phenyl(2-pyridyl) methylimino)methyl)phenolate ion (L2) and Cu(II) or Ni(II) salts, complexes having formulae [Cu(L2)(μ-1,1-NO3)]2 (1), [Cu(L2)(μ-Cl)]2 (2), [Cu2(L2)2(μ-1,2- SO4)] (3), [Cu2(L1)2(μ-1,2-SO4)] (4) and [Ni2(L2)2(OAc)(N(CN)2)(MeOH)] (5) were synthesized and characterized. Determination of molecular structures of all the five complexes confirmed the presence of a dimetallic core constructed by monochelates of the ligands. Compound 1, 2 have NO3- and Cl- bridge between two copper centers and 3-5 have phenoxo as well as SO42- (3,4) and OAc- (5) bridges. Compounds 1 and 2 have center of inversion in the dicopper core and are heterochiral. Whereas, in 3-5 center of inversion do not lie in the dimetallic core and are homochiral. Compound 1 has a rare feature of μ-1,1-NO3- bridge between two copper centers.
Molecular structures of dinuclear zinc(II) complexes of chiral tridentate imine and amine ligands: Effect of ligand geometry on diastereoselectivity
Jena, Himanshu Sekhar,Manivannan, Vadivelu
, p. 210 - 219 (2013/02/22)
Racemic mixtures of Schiff bases (L1H and L2H) were reduced to respective amines (L1′H and L2′H). Compounds of composition [Zn 2(L1)2(NCO)2] (1), [Zn(L1)N3] n (2), [Zn2(L2)2(NCO)2] (3), [Zn2(L1′)2(NCO)2] (1′), [Zn 2(L1)2(N3)2]·2DMF (2′·2DMF) and [Zn2(L2′)2(NCO) 2]·DMF (3′·DMF) were synthesized using these ligands, Zn(NO3)2·6H2O and NCO - or N3- ions. Molecular structures of all six compounds have been established. Both imine and amine ligands have N 2O donor set, but coordinate, respectively, in meridional and facial fashions. First four complexes are monochelates and last two are bis-chelates. The Zn2O2 unit in 1-3 has RS combination of imine where as in 1′ has RR(SS) combinations of amine. In 2′ and 3′, zinc(II) bis-chelates have cis,cis,trans-(OP)2(N A)2(NY)2 stereochemistry and cis-(OP)2 disposition further coordinate to tetrahedral zinc. Compound 1′ exhibits 1D hydrogen-bonded polymer by enantioselective H-bonding interaction. In 2′, DMF molecules assemble RR and SS bis-chelates through N-H?O interactions.
