The X-ray crystal structure of the cyclometallated dimer di-μ-bromo-bis[(2′,6′-dimethylazobenzenato-C2,N2)palladium(II)] (2) and its iodo analogue (3) are described. 2 crystallizes in the orthorhombic space group Pca21with a = 16.960(8) Å, b = 10.251(5) Å, c = 16.359(8) Å, Z = 4, U= 2844(2) Å3. Refinement of 244 parameters yielded R = 0.074 and Rw= 0.081. Crystals of 3 are orthorhombic, space group Pca21with a = 17.054(3) Å, b = 10.506(2) Å, c = 16.277(2) Å, Z = 4, U = 2916.3(8) Å3, R = 0.033 and Rw= 0.036 for 3048 reflections with I > 3σ (I). Structural features of 2 and 3 are compared with those of the chloro homologue 1. The possible effect of different bridging halides on the mesomorphism of related classes of compound is also discussed. © 1992.
Cyclopalladated compounds. Structural studies on dinuclear azobenzene complexes
Crispini, Alessandra;Ghedini, Mauro;Neve, Francesco
1993-01-01
Abstract
The X-ray crystal structure of the cyclometallated dimer di-μ-bromo-bis[(2′,6′-dimethylazobenzenato-C2,N2)palladium(II)] (2) and its iodo analogue (3) are described. 2 crystallizes in the orthorhombic space group Pca21with a = 16.960(8) Å, b = 10.251(5) Å, c = 16.359(8) Å, Z = 4, U= 2844(2) Å3. Refinement of 244 parameters yielded R = 0.074 and Rw= 0.081. Crystals of 3 are orthorhombic, space group Pca21with a = 17.054(3) Å, b = 10.506(2) Å, c = 16.277(2) Å, Z = 4, U = 2916.3(8) Å3, R = 0.033 and Rw= 0.036 for 3048 reflections with I > 3σ (I). Structural features of 2 and 3 are compared with those of the chloro homologue 1. The possible effect of different bridging halides on the mesomorphism of related classes of compound is also discussed. © 1992.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
