Research Article: Bis(4,4′′-difluoro-1,1′:3′,1′′-terphenyl-2′-carboxyl­ato-κO)bis­(3,5-dimethyl-1H-pyrazole-κN2)manganese(II)

Date Published: May 01, 2012

Publisher: International Union of Crystallography

Author(s): Sivanesan Dharmalingam, Yeojin Jeon, Sungho Yoon.


In the title compound, [Mn(C19H11F2O2)2(C5H8N2)2], the Mn2+ cation is coordinated by the N atoms of two 3,5-dimethyl­pyrazole ligands and carboxyl­ate O atoms from two 4,4′′-difluoro-1,1′:3′,1′′-terphenyl-2′-carboxyl­ato ligands, forming an MnN2O2 polyhedron with a slightly distorted tetra­hedral coordination geometry. Two intra­molecular hydrogen bonds are observed between the carboxyl­ate and pyrazole ligands. The combined influence of the sterically hindered carboxyl­ate ligands and the intra­molecular hydrogen-bonding inter­actions stabilizes the title compound with a low coordination number of four. In the crystal, weak C—H⋯F and C—H⋯O hydrogen bonds are observed.

Partial Text

For the synthesis of substituted terphenyl-based carboxyl­ate ligands, see: Saednya & Hart (1996 ▶); Du et al. (1986 ▶); Chen & Siegel (1994 ▶). For background to metal complexes with terphenyl-based carboxyl­ate ligands, see: Kannan et al. (2011 ▶); Yoon & Lippard (2004a ▶,b ▶); Lee & Lippard (1998 ▶, 2001 ▶, 2002 ▶) and for those with 3,5-dimethyl­pyrazole ligands, see: Zhang et al. (2007 ▶); Cheng et al. (1990 ▶).