Spontaneous Resolution Induced by a Chiral Ni(II) Complex with an Achiral Tripodal Ligand#. (18th February 2015)

• Record Type: Journal Article
• Authors: Sarkar, Shuranjan; Moon, Dohyun; Kim, Seog K.; Lah, Myoung Soo; Lee, Hong‐In
• Is Part Of: Bulletin of the Korean Chemical Society. Volume 36:Number 3(2015:Mar.)
• Page Start: 838
• Page End: 842
• Publication Date: 2015-02-18
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1002/bkcs.10157
• Languages: English
• ISSNs: 0253-2964

Abstract

<abstract abstract-type="main" id="bkcs10157-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p id="bkcs10157-para-0001">A chiral nickel(II) complex, [Ni(II)H₃L](ClO4)₂ (<bold>1</bold>), with an achiral ligand H₃L (=tris{2‐(4‐imidazolyl)methyliminoethyl}amine) was synthesized by <italic>in situ</italic> reaction between nickel(II) perchlorate hexahydrate and a condensation mixture of 4‐imidazolecarboxaldehyde and tris(2‐aminoethyl)amine. Single crystal X‐ray analysis revealed that the H₃L ligand hexadentately binds to Ni(II) ion through three Schiff‐base imine N atoms and three imidazole N atoms with distorted octahedral geometry. Both single‐crystal X‐ray diffraction and circular dichroism investigations found that the crystal of complex <bold>1</bold> was an enantiopure conglomerate. The hydrogen‐bond network of N_imidazoleH⋯O_ClO4⋯HN_imidazole induced spontaneous resolution to form the conglomerate. The capped tripod‐shaped [Ni(II)H₃L]²⁺ complex ions are hydrogen‐bonded in a tail‐to‐tail mode and array in an up‐and‐down manner repeatedly to honeycomb an extended two‐dimensional homochiral network with trigonal voids.</p> </abstract>