Lewis-Base Adducts of Lead(II) Compounds. XX. Synthesis and Structure of the 1:1 Adduct of Pyridine With Lead(II) Thiocyanate

Abstract

The synthesis and room-temperature single-crystal X-ray structure determination are recorded for a 1:1 adduct of lead(II) thiocyanate with pyridine (' py '). [( py ) Pb (SCN)2](∞|∞) is triclinic, Pī , a 10.544(1), b 7.3729(7), c 6.705(2) Ǻ, α 103.91(2), β 95.99(2), γ 100.51(1)°, Z = 2 f.u .; R was 0.041 for 3226 'observed' (I > 3σ(I)) reflections. The structure is a two-dimensional polymer in the be plane with eight-coordinate ( py -N)PbN₃S₄ linked by the familiar four- membered Pb₂S₂ and eight-membered Pb₂(NCS)₂ motifs by way of bridging thiocyanate groups; one of the latter, unusually, has a bifurcating bridging nitrogen atom leading to the introduction of Pb₂N₂ motifs. The structure of the parent lead(II) thiocyanate is also discussed.