Synthesis, Characterization and Crystal Structure of trans-2)pyridine-κN>chlorobis(trimethylphosphine)ruthenium(II) Perchlorate: Evidence for Meridional Steric Crowding

Article abstract of DOI:10.1039/DT9910002801

The synthesis, characterization, and crystal structure of trans-ClO4 are reported.The complex crystallizes in the non-centrosymmetric trigonal space group P3,21 (no. 152) with a = 14.158(2), c = 14.493(3) Angstroem, and Z = 3.Both the Ru^II-containing cation and the perchlorate anion (which is disordered) lie on a crystallographic two-fold axis.This represents the first structural characterization of a transition-metal complex which utilizes a member of the family of bis(pyrazolyl)pyridine ligands.In addition, the crystal structure yields evidence that the ligand L may be sterically more suitable for co-ordination to a ruthenium(II) centre than the analogous diphenyl-substituted terpyridine ligand, dpt (6,6''-diphenyl-2,2':6'2''-terpyridine).For both tridentate ligands, the donor nitrogen atoms take up three meridional sites and the phenyl substitutents are directed toward the fourth equatorial co-ordination site; however, due to the large distance between the two phenyl arms of L (relative to the dpt), the former ligand can be utilized in synthesizing the present ruthenium(II) complex whereas the analogous dpt complex cannot readily be prepared.

Full text of DOI:10.1039/DT9910002801

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