E. C. Alyea, S. A. Dias, George Fergusson
1979
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0
Influential Citations
14
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Journal
Inorganica Chimica Acta
Abstract
Abstract The synthesis and crystal and molecular structure of the dinitro(trimesitylphosphine)mercury(II) dimer is reported. The compound [HgP(mesityl) 3 (NO 3 ) 2 ] 2 belongs to the monoclinic space group P 2 1 / c (C 5 2h , No. 14) with a = 19.940(3), b = 17.588(2), c = 16.403(2) A , β = 100.36(1)° and Z = 4; the asymmetric unit contains two independent half dimers. The structure was refined to a final R of 0.056 for 4220 observed reflections measured by diffractometer. The mercury coordination in both dimers I and II is characterized by three strong nearly coplanar bonds (in I HgP 2.395(3), HgO 2.180(12) and 2.257(8), and 2.342(9)) and three weaker HgO bonds in the range 2.58–2.90 A . Both independent trimesityl phosphine ligands have the same regular propeller conformation (HgPCC torison angles 42 to 49°) and the largest CPC angles (mean value 113.2(5)°) and cone angle (θ = 208°) yet determined. The main difference between the two independent dimers is the orientation of the non-bridging nitrato groups. Nitrato vibrational and phosphine 1 H and 31 P n.m.r. data are also presented for [HgP(mesityl) 3 (NO 3 ) 2 ] 2 .