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

Abstract

Two new tetrachlorocobaltate(II) salts, [BzTPP]₂[CoCl₄]·H₂O (1) and [4NO₂BzTPP]₂[CoCl₄]·H₂O (2) ([BzTPP]⁺ = 1-benzyl- triphenylphosphonium; [4NO₂BzTPP]⁺ = 1-(4′-nitrobenzyl)tri- phenylphosphonium), have been prepared and characterized by elemental analysis, IR, MS, single-crystal X-ray diffraction, and magnetic susceptibility. Both 1 and 2 crystallize in the monoclinic space group P2₁/c. The [CoCl₄]²⁻ anion exhibits a distorted tetrahedral coordination geometry. The C-H···Cl, C-H···O, and C-H···π hydrogen bonds in 1 and 2 give rise to a 3D hydrogen-bonded network structure. Magnetic susceptibility measurements in the temperature range 2–300 K show that both 1 and 2 exhibit an antiferromagnetic coupling behavior.

Keywords:

• crystal structures
• magnetic properties
• substituted benzyl triphenylphosphonium
• tetrachlorocobaltate(II)

Acknowledgments

The authors thank the Science and Technology Project (No. 2011B080701026) from Guangdong Science and Technology Department, the key Academic Program of the 3rd phase “211 Project” of South China Agricultural University (No. 2009B010100001), the Guangdong Natural Science Foundation (No. 10151064201000022), and the University Students’ Innovative Experimental Project from Education Department of Guangdong Province (No.1056410002) for financial support of this work.