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. 2017 Jun 5;2(6):2474-2481.
doi: 10.1021/acsomega.7b00119. eCollection 2017 Jun 30.

Bite-Angle-Regulated Coordination Geometries: Tetrahedral and Trigonal Bipyramidal in Ni(II) with Biphenyl-Appended (2-Pyridyl)alkylamine N, N'-Bidentate Ligands

Divya Sasi  1 , Venkatachalam Ramkumar  1 , Narasimha N Murthy  1
Affiliations

Bite-Angle-Regulated Coordination Geometries: Tetrahedral and Trigonal Bipyramidal in Ni(II) with Biphenyl-Appended (2-Pyridyl)alkylamine N, N'-Bidentate Ligands

Divya Sasi et al. ACS Omega. .

Abstract

Two simple biphenyl-appended (2-pyridyl)alkylamine N-bidentate ligands, Le and Lm, having ethylene and methylene spacers between donor groups, with bite angles Le ≈ 100° and Lm ≈ 80°, dictate pseudotetrahedral and trigonal-bipyramidal geometries in six high-spin Ni(II)-halide complexes, [Ni(Le)X2] and [Ni(Lm)2X](ClO4) (where X = Cl-, Br-, I-), respectively. The structures in the solid state, determined using X-ray crystallography, and in solution, determined using spectroscopic methods (UV-vis-NIR and paramagnetic 1H NMR), which complement each other, are described.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Scheme 1
Scheme 1. Synthetic Route to Tetra- and Penta-Coordinate Ni(II)-Halide Complexes Dictated by the N-Bidentate Ligand Bite Angles
Figure 1
Figure 1
ORTEP (40% ellipsoid) plots of 1a and [2a]+. All H-atoms and counterions are omitted for clarity.
Figure 2
Figure 2
Electronic absorption spectra of 1b and 2b in CH2Cl2.
Figure 3
Figure 3
500 MHz 1H NMR spectra of 1b in CD2Cl2 and 2b in CDCl3. *Peaks due to solvent impurities.
See this image and copyright information in PMC

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