One-Dimensional Coordination Polymers of MnII, CuII, and ZnII Supported by Carboxylate-Appended (2-Pyridyl)alkylamine Ligands – Structure and Magnetism
✍ Scribed by Himanshu Arora; Francesc Lloret; Rabindranath Mukherjee
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 639 KB
- Volume
- 2009
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Abstract
Four new complexes [Mn^II^(L^1^OO)(H~2~O)][ClO~4~]·2H~2~O (1), [Zn^II^(L^1^OO)][ClO~4~]·2H~2~O (2), [Cu^II^(L^3^OO)][CF~3~SO~3~]·H~2~O (3), and [Zn^II^(L^3^OO)][ClO~4~] (4) (L^1^OO^–^ = 3‐[(2‐(pyridine‐2‐yl)ethyl){2‐(pyridine‐2‐yl)methyl}amino]propionate; L^3^OO^–^ = 3‐[(2‐(pyridine‐2‐yl)ethyl){(dimethylamino)ethyl}amino]propionate) have been synthesized and characterized by elemental analysis, IR, and UV/Vis spectroscopy. Structural analysis revealed that 1, 3, and 4 are one‐dimensional chain‐like coordination polymers. In 1 distorted octahedral MnN~3~O~3~ and in 3 square‐pyramidal CuN~3~O~2~ coordination is satisfied by three nitrogen atoms and an appended carboxylate oxygen atom of the ligand, and an oxygen atom belonging to the carboxylate group of an adjacent molecule. In 4 trigonal bipyramidal ZnN~3~O~2~ coordination environment is provided by two nitrogen atoms and an appended carboxylate oxygen atom of the ligand in the equatorial plane, and the two axial positions are satisfied by a tertiary amine nitrogen and an oxygen atom belonging to the carboxylate group of an adjacent molecule. In 1 the Mn^II^ center is coordinated by an additional water molecule. In these complexes each monomeric unit is sequentially connected by syn‐anti carboxylate bridges. Temperature‐dependent magnetic susceptibilities for 1 and 3 are measured, revealing antiferromagnetic interactions through syn‐anti carboxylate bridges between the M^II^ centers. Analysis of the crystal packing diagram reveals that in 1 extensive π–π stacking involving alternate pyridine rings of adjacent 1D chain exists, which eventually lead to the formation of a 2D network structure. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)