Syntheses, Crystal Structures, Weak Interactions, and Magnetic Properties of Two Tetrachloromanganate(II) Salts With Substituted Benzyl Triphenylphosphonium

Abstract

Two new tetrachloromanganate(II) salts, [BzTPP]₂[MnCl₄] (1) and [4NO₂BzTPP]₂[MnCl₄] (2) ([BzTPP]⁺ = 1-benzyl- triphenylphosphonium; [4NO₂BzTPP]⁺ = 1-(4′-nitrobenzyl) triphenylphosphonium), have been prepared and characterized. Compound 1 crystallizes in the triclinic space group P-1, while 2 is monoclinic P2₁/c. Both 1 and 2 comprise one [MnCl₄]²⁻ anion and two cations, and the [MnCl₄]²⁻ anion exhibits distorted tetrahedral coordination geometry. The cations of 1 form a dimer through C-H···π hydrogen bonds and π···π stacking interactions. The C-H···Cl and C-H···O hydrogen bonds result in a complicated hydrogen-bonded network. Magnetic susceptibility measurements in the temperature range 2–300 K show that both 1 and 2 exhibit very weak antiferromagnetic coupling behavior.

Keywords:

• crystal structure
• magnetic properties
• substituted benzyltriphenylphosphonium
• tetrachloromanganate(II)

Acknowledgments

The authors thank the Science and Technology Project (No.2011B080701026) from Guangdong Science and Technology Department and the key Academic Program of the 3rd phase “211 Project” of South China Agricultural University (No.2009B010100001) for financial support of this work.