Synthesis, Crystal Structure, Weak Interactions, Spectra and Magnetic Behavior of a New Ion-pair Complex Containing Bis(maleonitriledithiolato)nickel(III) Monoanion and Substituted Isoquinolinium Cation

Abstract

A new ion-pair complex, [BrClBzIQl][Ni(mnt)₂](1) ([BrClBzIQl]⁺ = 1-(2′ -chloro-4′ -bromobenzyl)isoquinolinium, and mnt²⁻ = maleonitriledithiolate) has been prepared and characterized by elemental analyses, IR, MS spectra, single crystal X-ray diffraction and magnetic susceptibility. The crystals are monoclinic space group, C c, a = 9.249(3) Å, b = 18.312(5) Å, c = 32.062(9) Å, β = 90.92(1)°, V = 5430(3) ų, Z = 4. The Ni(III) ions of 1 form a dimer with Ni…Ni distance being 4.332 Å through short Ni…S and S…S interactions. The weak anion-cation πvπ stacking interactions, C─H…N hydrogen bonds and short Ni…N interactions further generate a 3D network structure. Magnetic susceptibility measurement in the temperature range 2–300 K shows that 1 exhibits antiferromagnetic behavior with g = 2.02, J = −373.3 cm⁻¹.

Keywords:

• crystal structure
• magnetic property
• maleonitriledithiolate
• nickel
• substituted isoquinolinium
• weak interactions

The authors thank the Science and Technology Project (No.2008B080703005) from Guangdong Science and Technology Department and the President's Science Foundation of South China Agricultural University (No.2008X015) for financial support of this work.