Received 7 October 2009
Reaction of dichloridotetrakis(dimethyl sulfoxide)ruthenium(II) and N-[3,5-di-tert-butyl-2-(trimethylsilyloxy)benzyl]-N,N-bis(2-pyridylmethyl)amine (BPPA-TMS) affords the thermodynamic product cis,fac-[RuCl2(BPPA-TMS)(DMSO)] and kinetic product trans,mer-[RuCl2(BPPA-TMS)(DMSO)]. The title complex, [RuCl2(C30H43N3OSi)(C2H6OS)]·2CH2Cl2, crystallizes as a dichloromethane disolvate, with two formula units in the asymmetric unit. The complex exhibits a distorted-octahedral geometry about the low spin d6 RuII center. The BPPA-TMS ligand is coordinated in a facial fashion, with the DMSO ligand cis to the aliphatic nitrogen atom of the BPPA-TMS ligand. One of the two dichloromethane solvate molecules is disordered over two positions in a 0.695:0.305 ratio.
The application of tetradentate monoanionic (TDMA) ligands for stabilizing reactive metal complexes motivates ligand design efforts (Chomitz & Arnold, 2009). The TDMA precursor N,N-bis-(2-pyridylmethyl)(2-hydroxy-3,5-di-tert-butylbenzyl)amine (HBPPA) has been employed to prepare main group, transition metal and actinide BPPA complexes (Chomitz et al., 2007; Marinescu et al., 2007) but Ru(BPPA) complexes have not been reported. Coordination complexes of ruthenium that contain chlorido, DMSO, and pyridylic ligands demonstrate promising applications as chemotherapeutic agents (Velders et al., 2004; Bratsos et al., 2007). Substitution mechanisms for related complexes have been studied, see: Mola et al. (2007).
Data collection: SMART (Bruker, 2001); cell refinement: SAINT (Bruker, 2001); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BT5088 ).
The donors of the Petroleum Research Fund, administered by the American Chemical Society (ACS-PRF 48003-UFS), supported this research. PJF is grateful to Henry S. LaPierre and Victor G. Young, Jr for their expertise, and to the John Arnold research group for their hospitality.
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