Crystal structure and magnetic behavior within a new molecular magnet containing [Ni(dmit)₂]⁻ monoanion

ABSTRACT

In this study, a new metal-dithiolene charge transfer salt with a formula of [3,4-Cl,Cl-Bz-1-APy][Ni(dmit)₂] (1; 3,4-Cl,Cl-Bz-1-APy = 1-N-(3′,4′-dichlorobenzyl)pyridinium, dmit = l,3-dithiole-2-thione-4,5-dithiolate) was synthesized and characterized. The crystal of 1-Me₂CO belongs to triclinic space group P-1, the [Ni(dmit)₂]⁻ anions and 3,4-Cl,Cl-Bz-1-APy⁺ cations form mixed column stacks with alternating anionic (A) and cationic (C) in the …ACAC… fashion, along the crystallographic a-axis direction. The [Ni(dmit)₂]⁻ anions formed a uniform one-dimensional chain via lateral-to-lateral S…S contacts. From the view of crystal structure, an uniform S = ½ Heisenberg linear chain model could be chosen for the fits of the temperature dependent magnetic susceptibilities of 1, but the attempt on this fit is failed. The simple Curie-Weiss law was used for the fits of magnetic susceptibility of 1. The fitted Curie constant is larger than the spin-only value expected for an S = ½ system.

KEYWORDS:

• Charge-transfer salt
• crystal structure
• magnetic property

Funding

The authors thank National Nature Science Foundation of China and Natural Science Foundation of High Learning Institutions of JiangSu Province for their financial support (Grant Nos. 21301093 and 13KJD150002).