Cp★Ru(DMSO)2Cl und CP★Ru(TMEDA)Cl. Synthese und Molekülstruktur zweier Cp★Ru-Komplexe mit harten σ-Donatorliganden

Structural and solution equilibrium studies on half-sandwich organorhodium complexes of (N,N) donor bidentate ligands

Characterization, solution stability, chloride affinity and crystal structures of [Rh(η⁵-C₅Me₅)(N^N)(H₂O)]²⁺ complexes and their correlation analysis.

cis-1,3,5-Triaminocyclohexane as a facially capping ligand for ruthenium(II)

Reaction of cis-[RuCl2(DMSO-S)3(DMSO-O)] with cis-1,3,5-triaminocyclohexane (tach) results in the formation of [RuCl(tach)(DMSO-S)2]Cl, a valuable precursor for a wide range of other tach-containing Ru complexes. Reaction of [RuCl(tach)(DMSO-S)2]Cl with the chelating nitrogen-based ligands (N-N = bipyridine, phenanthroline, and ethylenediamine) affords [Ru(N-N)(DMSO-S)2(tach)][Cl]2. A similar reaction between [RuCl(tach)(DMSO-S)]Cl with the chelating phosphorus-based ligands (P-P = dppm, dppe, dppp, dppb, dppv, and dppben) leads to the formation of [RuCl(P-P)(tach)]Cl. The structures of 10 examples of the tach-containing complexes have been determined by single crystal X-ray diffraction. An examination of the structural metrics obtained from these studies indicates that the tach ligand is a strong sigma donor. In addition, the presence of the NH2 groups in the tach ligand allow for participation in hydrogen bonding further modulating the coordinative properties of the ligand.

Synthesis and Complexation Properties of the Anions (eta(5)-C(5)Me(5))Ru(PR(2)O)(3)(2)(-) as Ligands

Reaction of [(eta(5)-C(5)Me(5))Ru(OMe)](2) (2) with HP(O)(OR)(2) gave the novel tripod ligands H(2)(eta(5)-C(5)Me(5))Ru{PO(OR)(2)}(3) (R = Me, Et, (i)Pr, H(2)1). H(2)(eta(5)-C(5)Me(5))Ru{PO(Ph(2))}(3) was formed with HP(O)Ph(2). [(eta(5)-C(5)Me(5))RuCl(2)](2) (3) with NaP(O)(OEt)(2) similarly gave Na(2)(eta(5)-C(5)Me(5))Ru{PO(OEt)(2)}(3) (Na(2)1; Na(2)L). Either the hydrogen form or the sodium salt was reacted with main group and transition metal halides to yield complexes [ML(2)](n)()(-) (M = Si(IV), Ti(IV), Nb(IV), n = 0; Co(II), n = 2; Cr(III), Fe(III), n = 1), or complexes of the form LMX with MX = BPh, VO. Reaction of Na(2)(eta(5)-C(5)Me(5))Ru{PO(Ph(2))}(3) with TiCl(4) gave intermediately [LTiCl(2)](2) which readily hydrolyzed on chromatography over Al(2)O(3) to trinuclear (LTiO)(3)(&mgr;(3)-O)H(2). The latter was characterized by X-ray structure analysis. It crystallizes in the cubic space group Pa3 (No. 205), z = 8, a = 30.83(1) Å, V = 29300(30) Å(3). From the reaction of Na(2)1 and 3 under appropriate conditions, the mixed valence complex LRu(eta(5)-C(5)Me(5)) (4) was isolated. Compounds were characterized by spectroscopy and electrochemistry. From absorption spectra of the Co(II) and the Cr(III) complex ligand field parameters Delta(o) = 902 and 1450 cm(-)(1), respectively, were derived, placing 1 near F(-) in the spectrochemical series.