An Ionic Pair Complex Containing Bis(maleonitriledithiolato)palladium(II) Anion and Substituted 4-Dimethylaminopyridinium: Synthesis, Weak Interactions and 3D Network Structure

Abstract

An ionic pair complex, [FClBzDMAP]₂[Pd(mnt)₂] (1) , ([FClBzDMAP]⁺ = [1-(4′-fluoro-2′-chlorobenzyl)-4-dimetylamino pyridinium, mnt²⁻ = maleonitriledithiolate), was synthesized and characterized by elemental analyses, IR, UV-vis spectra, molar conductivities and single crystal diffraction. The crystal belongs to the triclinic system, space group P-1 with cell constants a = 8.3472(8) Å, b = 9.3988(9) Å, c = 13.5875(14) Å, α = 76.676(1)°, β = 86.036(1)°, γ = 71.182(1)°, Z = 1. It is interesting that the [FClBzDMAP]⁺ cations (C) and the [Pd(mnt)₂]²⁻ anions (A) in 1 stack into a 1D alternating CC-A-CC-A-CC column along ab direction, while the cations form a 1D column along bc direction. Some weak interactions such as p … π, π … π, Cl … S, and C─ H … N interactions in the crystal play important roles in the self-assembly process and give rise to a 3D network structure.

Keywords:

• 3D network structure
• maleonitriledithiolate
• palladium(II) complex
• substituted 4-dimetylaminopyridinium
• 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.