Mononuclear lanthanide complexes assembled from a tridentate NNO donor ligand: design of a DyIII single-ion magnet

Pankaj Kalita; Amit Malakar; Joydeb Goura; Subhashree Nayak; Juan Manuel Herrera; Enrique Colacio; Vadapalli Chandrasekhar

doi:10.1039/C9DT00504H

Mononuclear lanthanide complexes assembled from a tridentate NNO donor ligand: design of a Dy^III single-ion magnet†

Pankaj Kalita,

^a Amit Malakar,^ad Joydeb Goura,^ac Subhashree Nayak,^a Juan Manuel Herrera,

^b Enrique Colacio

*^b and Vadapalli Chandrasekhar

*^cd

Author affiliations

* Corresponding authors

^a School of Chemical Sciences, National Institute of Science Education and Research Bhubaneswar, HBNI, Jatni, Khurda – 752050, Odisha, India
E-mail: pankajkalita14@niser.ac.in, amitchem.27@gmail.com, joydebgoura@gmail.com, subhashree.nayak@niser.ac.in

^b Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avenida de Fuentenueva s/n, 18071 Granada, Spain
E-mail: ecolacio@ugr.es, jmherrera@ugr.es

^c Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
E-mail: vc@iitk.ac.in, vc@tifrh.res.in

^d Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500107, India

Abstract

The reaction of a tridentate NNO donor ligand, 4-nitro-2-((2-(pyridine-2-yl)hydrazono)methyl)phenol (HL) with lanthanide(III) nitrates in the presence of triethylamine afforded a new family of neutral mononuclear Ln^III complexes [Ln(NO₃)(L)₂(HOCH₃)] (Ln = Gd; (1) Tb; (2), Dy; (3), and Ho (4). The mononuclear complexes were structurally characterized by single crystal X-ray diffraction studies which revealed a spherical tricapped trigonal prism geometry with a pseudo D_3h symmetry around the Ln^III centre. Static (dc) and dynamic (ac) magnetic studies have been performed on these complexes. Field-induced single-ion magnet behaviour was observed in the Dy^III analogue with an effective energy barrier and an pre-exponential factor of Δ/k_B = 68(2) K and τ₀ = 1.8 × 10⁻⁷ s, respectively.

This article is part of the themed collection: Inorganic chemistry of the p-block elements

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Article information

DOI: https://doi.org/10.1039/C9DT00504H
Article type: Paper
Submitted: 01 Cʼhwe. 2019
Accepted: 08 Meur. 2019
First published: 08 Meur. 2019

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Dalton Trans., 2019,48, 4857-4866

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Mononuclear lanthanide complexes assembled from a tridentate NNO donor ligand: design of a Dy^III single-ion magnet

P. Kalita, A. Malakar, J. Goura, S. Nayak, J. M. Herrera, E. Colacio and V. Chandrasekhar, Dalton Trans., 2019, 48, 4857 DOI: 10.1039/C9DT00504H

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