Synthesis, crystal structure and magnetism of a one-dimensional Mn^II chain with a single μ_1,3-azido as bridge ligand

Abstract

A new 1-D Mn^II chain, [Mn(μ _1,3-N₃)(phenCl)₂]_n (ClO₄)_n (phenCl = 2-chloro-1,10-phenanthroline), was synthesized with single μ _1,3-azido as bridge and 2-chloro-1,10-phenanthroline as coligand, and its crystal structure determined by X-ray crystallography. In the complex, Mn^II is located in a distorted octahedral geometry, and azide is an end-end bridge, linking two Mn^II ions with separation of 5.7356(10) Å, forming a 1-D chain. In the crystal, there are two kinds of π-π stacking between adjacent chains. The fitting of the variable-temperature (2.00–320 K) magnetic susceptibilities gave an anti-ferromagnetic interaction of J = –5.99 cm^–1 (), among the stronger magnetic interaction in Mn^II complexes with azido as single end-end bridge. Reported experimental results do not confirm clearly the magneto-structural correlations revealed by theoretical calculations.

Keywords:

• Magnetism
• Manganese(II) complex
• Crystal structure
• Azido ligand

Acknowledgments

This work was financially supported by the Natural Science Foundation of China (No. 20971080), the National Natural Science Foundation for the Youth of China (Grant No. 10704041), and the Natural Science Foundation of Shandong Province of China (No. ZR2009BM026).