Abstract
Two layered Co(II) amino acid Schiff base complexes, [Co(napala)(tbpe)0.5]n (1) and [Co(napgly)(tbpe)0.5]n (2) [H2napala=N-(2-hydroxy-1-naphthylmethylidene)-d/l-alanine, H2napgly=N-(2-hydroxy-1-naphthylmethylidene)-glycine and tbpe=trans-1,2-bis(4-pyridyl)ethylene], have been synthesized by solvothermal methods and characterized using single-crystal X-ray diffraction. The bridging of Schiff base ligands napala2− or napgly2− with Co(II) forms one-dimensional (1D) left- and right-handed helical chains which are further pillared by tbpe to build a two-dimensional (2D) grid-based hcb-type framework. Moreover, both complexes show high thermal stability and exhibit antiferromagnetic coupling between the Co(II) centers mediated by the syn–anti-COO−-bridges.
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