Chain-Structured cis-Hydroxoaquachromium(III) Complexes and Their Magnetic Properties

Michael Ardon*, Avi Bino, Kirsten Michelsen, Erik Pedersen, Robert C. Thompson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Antiferromagnetic coupling between chromium(III) atoms was found to exist in two cis-hydroxoaquachromiu(III) complexes, having a chain structure with μ-H3O2- bridges. Compound 1, trans-[Cr(Py)2(H3O2)2]Cl (Py = pyridine), consists of infinite chains of Cr(III) ions bridged by two H3O2- units with Cr···Cr and O···O separations of 5.2073(5) and 2.422(2) Å, respectively. Compound 2, α-cis-[Cr(bispicen)(H3O2)]I2 [bispicen = N,N′-bis(2-pyridylmethyl)-1,2-ethanediamine], consists of infinite chains of Cr(III) ions bridged by one H3O2- unit with Cr···Cr and O···O separations of 5.6328(6) and 2.428(5) Å, respectively. The exchange coupling constants, J = -1.31 cm-1 in 1 and J = -0.47 cm-1 in 2, were obtained by magnetic susceptibility measurements between 2 and 81 K. These values indicate intrachain antiferromagnetic interactions, mediated by hydrogen bonding through μ-H3O2 bridges. Compound 1 crystallizes in the monoclinic space group C2/c with a = 9.967(1) Å, b = 15.020(3) Å, c = 9.909(2) Å, β= 116.81(3)°, and Z = 4. Compound 2 crystallizes in the monoclinic space group C2/c with a = 21.380(4) Å, b = 9.793(1) Å, c = 10.220(2) Å, β= 116.69(2)° and Z = 4.

Original languageEnglish
Pages (from-to)x1-4150
JournalInorganic Chemistry
Volume36
Issue number19
DOIs
StatePublished - 1997

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