Interaction of methylmercury(II) with bidentate ligands containing pyridine and pyrazole rings. Synthesis and structure of methyl[1-(2-pyridyl)pyrazole]mercury(II) nitrate and [di(1-pyrazolyl)methane]methylmercury(II) nitrate

Abstract

The complexes [MeHgL]N03[L = 1-(2-pyridyl)pyrazole or di(1-pyrazolyl)methane] have L present as bidentate ligands to give irregular three coordination for Hg in the CHgN2 moieties. The 1-(2-pyridyl)pyrazole complex has C(1)-Hg-N(1) 168(2)° and Hg-N(1) 2·21(3) A [N(1) is the pyrazole donor atom], Hg-N(1')(pyridine ring) 2·61(5) A, and nitrate oxygen atoms 2·97(3), 3·07(3), and 3·14(3) Afrom Hg. The di(l-pyrazolyl)methane cation complex has C(1)-Hg-N(1) 179(1), Hg-N(1) 2·16(1), Hg-N(1') 2·96(2) A, and nitrate oxygen atoms 2·88(2)and 2·90(2) A from Hg. In both structures the cations and anions are grouped to form [MeHgL]NO3 dimeric units via Hg...O interactions.