4, Ddcd= 1.232 g~ m-~. The final R factor was 0.10 for 1629 observed reflections. Complex 2: space group R3 (rhombohedral), a= b= c= 18.395 (3) A, a= p= y= 116.28 (2)', V= 3038 (4) A3, Z= 3, Dcdcd= 1.489 g~ m-~. The final R factor was 0.062 (R,= 0.064) for 1966 observed reflections. Complex 3: space group Pnma (orthorhombic), a= 21.864 (10) A, b= 27.188 (11) A, c= 8.951 (5) A, V= 5321 (4) A3, Z= 4, Ddcd= 2.153 g~ m-~. The final R factor was 0.052 ...