Magneto-structural studies on [CuII2{L3-(μ2-1,1-CO2)2}2]•MeOH•H2O and [CuII4{L4-(μ2-1,3-CO2)(μ2-1,3-CO2Me)}4](ClO4)4 using carboxylate- / carboxymethylester-appended (2-pyridyl)-alkylamine ligands differing in alkyl chain length

Shashi Kant, Munirathnam Manda, Narottam Mukhopadhyay, Himanshu Arora, Indresh Verma, Francesc Lloret, Rabindranath Mukherjee

Research output: Contribution to journalArticlepeer-review

Abstract

Two discrete complexes [CuII2{L3-(CO2)2}2]•MeOH•H2O (1) and [CuII4{L4-(CO2)(CO2Me)}4](ClO4)4•unknown solvent (2) have been synthesized from the reaction between copper(II) salts and L3-(CO2Me)2 / L4-(CO2Me)2 [3,3′-[(pyridin-2-ylmethyl)imino]dipropionate dimethylester / 3,3′-[(pyridin-2-ylethyl)imino]dipropionate dimethylester]. Structural analysis reveals that 1 is a monatomic bridging carboxylate dinuclear complex with CuII22-1,1-OCO)22+ structural unit. Each Cu(II) centre has distorted square-pyramidal CuN2O3 coordination, provided by two N (pyridyl and amine) and two carboxylate O from L3-(CO2)2 and the fifth coordination is provided by an O atom belonging to the carboxylate group of an adjacent molecule. Complex 2 is a syn-anti carboxylate-bridged tetranuclear coordination cluster with a {CuII4{(μ2-1,3-OCO)(μ2-1,3-OCOMe)}44+ structural motif. Here also, each Cu(II) centre has distorted square-pyramidal CuN2O3 coordination, and an O atom belonging to the carboxylate group of an adjacent molecule completes the fifth coordination. Variable temperature magnetic studies reveal antiferromagnetic coupling in 1 (J = –8.37(6) cm−1), while 2 exhibits ferromagnetic behaviour (J = +13.1(1) cm−1).

Original languageEnglish
Article number116652
JournalPolyhedron
Volume245
DOIs
StatePublished - 15 Nov 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd

Funding

Financial assistance (CRG/2018/000151) received from the Science and Engineering Research Board (SERB), Department of Science & Technology (DST), Government of India, is gratefully acknowledged. S.K. and M.M. gratefully acknowledge the Senior Research Fellowship (SRF) award by the University Grant Commission (UGC), New Delhi, India. N.M. gratefully acknowledges the Senior Research Fellowship (SRF) award by DST-INSPIRE, Government of India. H.A. and I.V. gratefully acknowledge the Senior Research Fellowship (SRF) award by the Council of Scientific and Industrial Research, Government of India.

FundersFunder number
Department of Science and Technology, Ministry of Science and Technology, India
Council of Scientific and Industrial Research, India
University Grants Commission
Science and Engineering Research Board

    Keywords

    • Anti- and ferromagnetic exchange coupling
    • Carboxylate as bridging ligand
    • Crystal structures
    • Dimer
    • Tetramer

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