Unvollständinge Chelatisierung durch N-Acylthioharnstoffe: Die Struktur von Bis[N-(1-pyrrolidinyl-thiocarbonyl)-benzamidato]quecksilber(II)

Incomplete Chelation by N-Acylthioureas: Structure of Bis[N-(1-pyrrolidinyl-thiocarbonyl)-benzamidato] mercury(II) Bis[N-(1-pyrrolidinyl-thiocarbonyl)-benzamidato]mercury(II) crystallizes in the monoclinic space group P2₁/c with a = 10.126, b = 22.347, c = 11.384 Å, β = 109.13° and Z = 4. The structure was solved by application of direct methods to difference structure factors (DIRDIF). The final R value was R = 0.06 for 2195 observed reflections. Mercury exhibits the characteristic coordination number 2 with linear arrangement of the S ligators. Both O ligators, however, show weak bonds to Hg. For that reason the mercury complex should be better described as a labilized chelate with the effective coordination number 4. With regard to the excellent extractibility of mercury(II) with N-acylthioureas the formation and existence, respectively, of such a labilized chelate seems to be favourable.