1. Chiral Synthesis of a Mononuclear Nickel(Il) Complex Formed from an Achiral Tripodal Amine Ligand: Spontaneous Resolution.
- Author
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A. Srinivasa Rao, Abhijit Pal, Ghosh, Rajarshi, and Das, Samar K.
- Subjects
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CHIRALITY of nuclear particles , *NICKEL compounds , *AMINES , *LIGANDS (Chemistry) , *MICROENCAPSULATION , *NITROGEN - Abstract
A neutral chiral mononuclear Ni(ll) complex cis-[Ni(NCS)[sub2](tren)] (1) [tren = tris(2-aminoethyl)amine] has been isolated in a reaction of nickel(lI) salt with an achiral ligand tren and NH[sub4]SCN in ,a MeOH-H[sub2]O (1:1) mixture. The crystal structure of 1 reveals the encapsulation of Ni(ll) ions in a facial (NiN[sub6]) coordination environment that includes four nitrogen donors from the tetradentate chelate tren and two nitrogen donors from two cis-NCS (monodentate) ligands. The chirality of 1 arises from symmetry breaking of the cis-(NCS)[sub2]-Ni(ll) octahedral complex by the tetradentate chelate tren. Compound 1 exhibits both its enantiomers in a DMF solution through a Pfeiffer effect when l- and d-arabinose are used as environment substances. The particular synthesis, described herein, offers total spontaneous resolution, as is evidenced from crystal structure and circular dichroism spectral studies. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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