Issue 46, 2018

Magnetostructural relationships in polymorphic ethylmalonate-containing copper(ii) coordination polymers

Abstract

Three ethylmalonate-containing copper(II) chiral complexes of the formula {[Cu(H2O)4][Cu(Etmal)2(H2O)]}n (1), [Cu(Etmal)(H2O)]n (2) and {[Cu(Etmal)(H2O)]·H2O}n (3) (H2Etmal = ethylmalonic acid) were obtained by reacting copper(II) nitrate trihydrate, ethylmalonic acid and sodium carbonate in water. Compound 1 is a chiral zigzag chain with regular alternation of [Cu(Etmal)2(H2O)]2− and [Cu(H2O)4]2+ units, the former acting as bis-monodentate ligands toward the latter ones through the two carboxylate groups. The chirality of 1 is a result of the [Cu(Etmal)2(H2O)]2− fragment whose five-coordinate copper(II) surrounding exhibits the Δ or Λ conformation within the Δ or Λ-crystals. The structure of 2 is made up of corrugated square grids of aquacopper(II) units connected through ethylmalonate-carboxylate bridges, with the chirality arising from the relative orientation of the stacking layers. 3 is a chiral three-dimensional compound which consists of ethylmalonate-carboxylate bridged aquacopper(II) units with pores of 9.5 Å diameter where the water molecules of crystallization are hosted. Cryomagnetic measurements of 1–3 show the occurrence of weak intrachain antiferromagnetic coupling (1), ferromagnetic coupled layers (2) and ferromagnetic ordering (3), the ethylmalonate-carboxylate bridge in the antisyn conformation providing the exchange pathway in this series of compounds. Alternating current magnetic measurements at very low temperatures reveal the presence of a frequency-independent out-of-phase signal at 3.0 K for 3, a feature which is the signature of the occurrence of long-range ferromagnetic ordering in this compound (Tcca. 3.0 K).

Graphical abstract: Magnetostructural relationships in polymorphic ethylmalonate-containing copper(ii) coordination polymers

Supplementary files

Article information

Article type
Paper
Submitted
18 Leo 2018
Accepted
12 Mph 2018
First published
15 Mph 2018

CrystEngComm, 2018,20, 7464-7472

Magnetostructural relationships in polymorphic ethylmalonate-containing copper(II) coordination polymers

J. Pasán, J. Sanchiz, F. Lloret, M. Julve and C. Ruiz-Pérez, CrystEngComm, 2018, 20, 7464 DOI: 10.1039/C8CE01595C

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements