Discrete unusual mixed-bridged trinuclear CoIII2CoIIand pentanuclear NiIIcoordination complexes supported by a phenolate-based ligand: theoretical and experimental magneto-structural study

Richa, Muni Rathnam, Akhilesh Kumar, Indresh Verma, Julia Kłak, Joan Cano, Antonio J. Mota, Amit Rajput, Himanshu Arora

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Two new complexes [CoIII2CoII(μ-OL)2(μ-OOCCH3)2(μ-N3)2(N3)2]·Et2O (1·Et2O) and [NiII5(μ-OL)4(μ-OOCCH3)2(OOCCH3)2(μ-N3)2]·CH3CN (2) (HOL = 2-((2-(pyridin-2-yl)ethylamino)methyl)phenol) have been synthesized and characterized by elemental analysis, IR, and UV/Vis spectroscopy. Structural analysis revealed that1is a discrete trinuclear and2is a discrete pentanuclear coordination complex. In complex1, terminal metal (CoIII) is in a distorted octahedral MN4O2environment where coordination is satisfied by two nitrogen atoms and one oxygen atom of the ligand, and an oxygen atom from the acetate group and two nitrogen atoms from azide (one each from the bridging and terminal ones). The central metal (CoII) is also in a distorted octahedral MN2O4environment where coordination is satisfied by two oxygen atoms from the phenoxo bridge, two oxygen atoms from the acetate bridge and two nitrogen atoms from the azide bridge. In complex2, each Ni is in a distorted octahedral MN2O4/MN3O3environment where coordination is satisfied by different donor atoms (amine, pyridine, acetate, phenolate and azide). Direct current (DC) variable-temperature magnetic susceptibility measurements on polycrystalline samples of1·Et2O and2were carried out in the temperature range of 1.8-300 K. The magnetic behaviour of1·Et2O indicates the presence of magnetic anisotropy of the cobalt(ii) ion. The magnetic data of2reveal the coexistence of antiferromagnetic and ferromagnetic interactions within the Ni5unit. Theoretical calculations made from the crystal structures reveal a very good agreement with the experimental findings.

Original languageEnglish
Pages (from-to)6053-6066
Number of pages14
JournalNew Journal of Chemistry
Volume45
Issue number13
DOIs
StatePublished - 7 Apr 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2021.

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