A copper(II) coordination polymer of formate-bridged dimers: an alternating S = ½ antiferromagnetic chain

Authors

Anthony W. Addison, Drexel University
Raymond Butcher, Howard University
Mark Turnbull, Clark University

Document Type

Article

Abstract

Reaction of 1,3-propanediamine with copper(II) perchlorate hexahydrate in basic solution in the presence of trimethyl orthoformate and o-iodophenol serendipitously formed sodium [triformato-diperchlorato-di-1,3-propanediaminodicopper(II)], Na[Cu₂(HCO₂)₃(1,3-pn)₂](ClO₄)₂ (1). Single-crystal X-ray diffraction measurements show the compound to be a coordination polymer with the Cu(II) ions alternately bridged in μ_1,1- and μ_1,3-fashion by the formate ions. The sodium ions are coordinated to both formate ions and perchlorate ions in the lattice. Magnetic measurements were made over the range 1.8-310 K and show the presence of a singlet ground state at low temperature, the µ_1,1-bridged copper ions being strongly antiferromagnetically coupled. The data were modeled equally well, within experimental error, by the alternating chain model and the dimer model with a Curie-Weiss correction for weak inter-dimer interactions, yielding C = 0.432(2) emu-K/mol-Oe, J/k_B = −94.3(9) K and J’ = −2.4(1.5) K ((Formula presented.)). © 2023 Informa UK Limited, trading as Taylor & Francis Group.

Publication Title

Journal of Coordination Chemistry

Publication Date

3-2023

ISSN

0095-8972

DOI

10.1080/00958972.2023.2176227

Keywords

alternating chain, Cu(II), magnetism, X-ray

Repository Citation

Addison, Anthony W.; Butcher, Raymond; and Turnbull, Mark, "A copper(II) coordination polymer of formate-bridged dimers: an alternating S = ½ antiferromagnetic chain" (2023). Chemistry. 7.
https://commons.clarku.edu/chemistry/7