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Facile synthesis of Cu(II) complexes of mono- and bicondensed N donor Schiff base 1H-pyrazolate ligands: crystal structures, spectroscopic and magnetic properties.
Autorzy
Rok wydania
2012
Czasopismo
Numer woluminu
37
Strony
77-84
DOI
10.1016/j.poly.2012.02.015
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Two [2 × 2] grid-like complexes, [Cu4(L1)4]·2МеОН·2Н2О·dmf (1) and [Cu4(L2)4]·2NaClO4·2МеОН (2) based on new substituted pyrazole ligands 5-(1-((2-aminoethyl)imino)ethyl)-4-methyl-1H-pyrazole-3-carboxylic (H2L1) acid and 5-(1-((3-aminopropyl)imino)ethyl)-4-methyl-1H-pyrazole-3-carboxylic acid (H2L2) have been synthesized and characterized spectroscopically and crystallographically. It was found that the ligand H2L2 condenses with 3-acetyl-4-methyl-pyrazole-5 carbonic acid (H2L) to produce a new dinuclear Cu(II) complex upon reaction with Cu(ClO4)2·6H2O and CuAc2·2H2O. In the grid complexes the four Cu(II) atoms are in square-pyramidal environment formed by two pyrazole, imine and amine N atoms, and the carboxylate O atom and occupy the corners of a [2 × 2] grid with the Cu⋯Cu separations, varying from 3.998(1) to 4.2049(9) and 4.794(1) to 5.091(1) Å for the adjacent and diagonal atoms, respectively. In the dinuclear complex 3 the metal ions are found in square planar environment with their coordination planes lying roughly within the plane of the pyrazolate heterocycle. The separation between Cu(II) centers is 3.921(1) Å. Magnetic susceptibility measurements of 3 revealed the presence of strong antiferromagnetic interaction, with a J value of −207.5 cm−1. This is larger than the J values found for the 1 and 2 grid complexes, which are −20.2 and −18.3 cm−1, respectively.
Słowa kluczowe
Pyrazole ligands, Copper(II), Grid complexes, magnetic properties, Template reaction
Adres publiczny
https://doi.org/10.1016/j.poly.2012.02.015
Strona internetowa wydawcy
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