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Crystals 2017, 7(8), 247; doi:10.3390/cryst7080247

Two Supramolecular Cobalt(II) Complexes: Syntheses, Crystal Structures, Spectroscopic Behaviors, and Counter Anion Effects

School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
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Academic Editor: Shujun Zhang
Received: 5 July 2017 / Revised: 26 July 2017 / Accepted: 30 July 2017 / Published: 9 August 2017
(This article belongs to the Section Crystal Engineering)
View Full-Text   |   Download PDF [5356 KB, uploaded 9 August 2017]   |  

Abstract

Two new Co(II) complexes, [{Co(L)}2{Co(Pic)2(CH3OH)2}] (1) and [{CoL(μ-OAc)}2Co] (2), where H2L = 2,2′-[Ethylenedioxybis(nitrilomethylidyne)]dinaphthol, were designed, synthesized and characterized by elemental analysis, FT-IR spectra, UV-Vis spectra, and X-ray crystallography. Complex 1 consists of two [CoL] and one [Co(Pic)2(CH3OH)2] (Pic = picrate) units and in the [CoL] unit, the Co(II) atom is tetra-coordinated with a slightly distorted square-planar geometry. In the [Co(Pic)2(CH3OH)2] unit, the Co(II) atom is hexa-coordinated with a slightly distorted octahedral geometry. Meanwhile in complex 2, two acetate ions coordinate to three Co(II) atoms through Co-O-C-O-Co bridges and four μ-naphthoxo oxygen atoms from two [CoL] units also coordinated to the central Co(II) atom. Thus, complex 2 has two distorted square pyramidal coordination geometries around the terminal Co(II) atom and an octahedral geometry around the central Co(II) atom. The supramolecular structures of complex 1 is a 3D-network supramolecular structure linked by C-H···O hydrogen bonds and π···π stacking interaction, but complex 2 possesses a self-assembled 2D-layer supramolecular structure linked by C-H···π and π···π stacking interactions. The structure determinations show that the coordination anions are important factors influencing the crystalline array. View Full-Text
Keywords: Co(II) complex; Salamo-type ligand; synthesis; crystal structure; supramolecular interaction; anion effects Co(II) complex; Salamo-type ligand; synthesis; crystal structure; supramolecular interaction; anion effects
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MDPI and ACS Style

Jia, H.-R.; Li, J.; Sun, Y.-X.; Guo, J.-Q.; Yu, B.; Wen, N.; Xu, L. Two Supramolecular Cobalt(II) Complexes: Syntheses, Crystal Structures, Spectroscopic Behaviors, and Counter Anion Effects. Crystals 2017, 7, 247.

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