Syntheses, Crystal Structures, and Magnetic Properties of Two Hybrid Materials Self-Assembly from Tetra(isothiocyanate)cobalt(II) Anion and Substituted Benzyl Triphenylphosphinium

Abstract

Two hybrid materials, [4RBzTPP]₂[Co(NCS)₄] (NCS⁻ = isothiocyanate, [4RBzTPP]⁺ = 4-R-benzyltriphenylphosphinium, R = F(1), Br(2)), have been prepared and characterized by elemental analyses, IR, UV spectra, X-ray diffraction, and magnetic susceptibility measurements. The Co(II) ions of the [Co(NCS)₄]²⁻ anions in 1 form a 1D chain through S···S interactions with the distance of 3.508 Å, while the anions and the [4BrBzTPP]⁺ cations formed an alternate chain by p···π, C-H···Co weak interaction and C-H···Br hydrogen bond in 2. Magnetic susceptibility measurement in the temperature range 2–300 K shows that both 1 and 2 exhibit a weak antiferromagnetic coupling property.

Keywords:

• crystal structure
• magnetic properties substituted benzyltriphenylphosphonium
• tetra(isothiocyanate)cobalt(II) anion

Acknowledgments

This work has been partially supported by the Guangdong Natural Science Foundation (No. 10151064201000022), the key Academic Program of the 3rd phase “211 Project” of South China Agricultural University (No. 2009B010100001), and the university students’ innovative experimental project (No. 1056411140) from Education Department of Guangdong Province.