Chemistry

The odd-even effect in n-carboxyalkylammonium-containing organic-inorganic hybrids of Mn(ii) halides: structural and magnetic characterisation

Document Type

Article

Abstract

The understanding of magnetic properties of hybrid compounds is important for the design of magnetic devices. In this contribution a prominent odd-even effect in both the structural characteristics and magnetic properties of four new hybrid compounds comprised of n-carboxyalkylammonium cations and perchloridomanganate anions is reported. When the n-carboxyalkylammonium cations contain an even number of carbon atoms, compounds of the formula (NH3(CH2)nCOOH)2[MnCl4], with n = 3 and 5, are formed, which display the two-dimensional (2D) hybrid halide perovskite structure in which bridging chlorido ligands link Mn2+ ions. Compounds containing n-carboxyalkylammonium cations with an odd number of carbon atoms have the formula (NH3(CH2)nCOOH)2[MnCl4(H2O)2], with n = 2 and 4, and display a zero-dimensional (0D) structure with hydrogen bonding interactions linking neighbouring [MnCl4(H2O)2]2− anions. The odd-even effect is also evident in the magnetic properties of the compounds, which are linked to the structural differences observed in these compounds. Compounds containing an even number of carbon atoms show antiferromagnetic (AFM) interactions and spin canting at temperature TN, with 2JK = −8.28(5) K and TN = 45.0(5) K when n = 3 and 2JK = −7.72(4) K and TN = 43(1) K when n = 5. Much weaker AFM interactions and no spin canting is observed in compounds containing an odd number of carbon atoms, with 2JK = −0.14(2) K when n = 2 and 2JK = −0.14(2) K when n = 4. © 2023 The Royal Society of Chemistry.

Publication Title

CrystEngComm

Publication Date

11-9-2023

Volume

25

Issue

47

First Page

6568

Last Page

6591

ISSN

1466-8033

DOI

10.1039/d3ce00855j

Keywords

ammonia, atoms, hydrogen bonds, magnetic properties, organic-inorganic materials, Perovskite, positive ions, structural properties

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