Tin(IV), germanium(IV) and silicon(IV) complexes of the dianion of 5, 14-dihydro-6,8,15,17-tetramethyldibenzo-[b,i][1,4,8,11]tetraazacyclotetradecine (H2L): crystal structures of trans-Sn(L)Cl2 and trans-Sn(L)(NO3)2·MeCN

Abstract

The macrocyclic complexes M(L)X₂(H₂L = 5,14-dihydro-6,8,15,17-tetramethyldibenzo[b,I][1,4,8,11]- tetraazacyclotetradecine; M = Sn, X = Cl, Br or I; M = Ge, X = Cl; M = Si, X = Cl) have been prepared by the reaction of the tetrahalide MX₄ with H₂L (M = Sn or Ge) or Li₂L (M = Si) under mild conditions. Treatment of Sn(L)Cl₂ with AgNO₃ produces Sn(L)(NO₃)_2′ which in turn gives Sn(L)F₂ upon reaction with [NBu₄]F. X-Ray crystal structures of Sn(L)Cl₂ and Sn(L)(NO₃)₂·MeCN reveal that the complexes retain the characteristic saddle-shaped configuration of the ligand but have adopted a trans geometry.