Di-μ₂-chlorido-bis­[chlorido(η⁵-2,3,4,5-tetra­methyl-1-propyl­cyclo­penta­dien­yl)iridium(III)]

The asymmetric unit of the title complex, [Ir₂Cl₄(C₁₂H₁₉)₂], a versatile starting material for the preparation of uniquely substituted penta­alkyl­cyclo­penta­dien­yl–iridium complexes, consists of an iridium(III) atom, a substituted cyclo­penta­dienyl ligand and two chlorine ligands. The full dimer is generated by an inversion center. In the dimer, the two Ir^III atoms and two bridging Cl atoms form a perfectly planar ring. The two Ir^III atoms and the two terminal Cl atoms also form a rigorous plane that is orthogonal [89.48 (3)°] to the Ir₂Cl₂ ring. The plane of the cyclo­penta­dienyl ligand forms a dihedral angle of 54.06 (7)° with respect to the Ir₂Cl₂ ring.

Aqua­bis­(4-methyl­benzene­sulfonato-κO)(η⁵-penta­methyl­cyclo­penta­dien­yl)rhodium(III) monohydrate

The title half-sandwich rhodium(III) complex, [Rh(C₁₀H₁₅)(C₇H₇O₃S)₂(H₂O)]·H₂O, consists of a π-bonded penta­methyl­cyclo­penta­dienyl group, two σ-bonded tosyl­ate groups and an aqua ligand. The structure displays both inter- and intra­molecular O—H...O hydrogen bonding. The inter­molecular hydrogen bonding results in an extended helical chain along a 2₁ screw axis parallel to c, due to hydrogen bonding from the coordinating water ligand to the lattice water mol­ecule and then to a sulfonate O atom of a different asymmetric unit.

(S)-α-Benzyl­prolinium cis-[(S)-α-benzyl­prolinato]dichloridopalladium(II)

The title complex salt, (C₁₂H₁₆NO₂)[PdCl₂(C₁₂H₁₄NO₂)], is of inter­est with respect to organic and organometallic catalysis. The compound crystallizes as very small orange–red irregular prisms and the asymmetric unit contains three crystallographically distinct cation–anion pairs. The coordination geometry about the palladium atoms is square-planar with the chloride ligands cis to one another. The structure displays N—H...Cl and O—H...O hydrogen bonding such that the N—H...Cl hydrogen bonds align the cation–anion pairs in a linear fashion along [001], with the O—H...O hydrogen bonds connecting these linear strands along [100] and [010].

Bis[bis­(penta­methyl­cyclo­penta­dien­yl)cobalt(III)] tetra­chlorido­cobaltate(II) di­chloro­methane disolvate

The title compound, [Co(C₁₀H₁₅)₂]₂[CoCl₄]·2CH₂Cl₂, was isolated as a dichloromethane solvate and was formed in the reaction between lithium penta­methyl­cyclo­penta­dienide and anyhydrous cobalt(II) chloride in tetra­hydro­furan. There are two deca­methyl­cobaltocenium cations, one tetrachloridocobaltate(II) anion and two di­chloro­methane solvent mol­ecules in the formula unit. There is a slight disorder of the di­chloro­methane solvent which was treated with a two-site model [occupancy rates = 0.765 (4) and 0.235 (4)]. The di­chloro­methane mol­ecules display significant C—H...Cl inter­actions with the tetrachloridocobaltate(II) dianion. The cobalt atom of the deca­methyl­cobaltocenium cation sits on a twofold rotation axis, with only one penta­methyl­cyclo­penta­diene ligand being unique and the second generated by symmetry. The cobalt atom of the [CoCl₄]⁻² ion sits on a special site with -4 symmetry, with one unique chloride ligand and the others generated by the fourfold inversion axis.

Bis­(η²-ethyl­ene)(η⁵-inden­yl)iridium(I)

The asymmetric unit of the title compound, [Ir(C₉H₇)(C₂H₄)₂], consists of two independent mol­ecules. The bonding between iridium and the five-membered ring of the indenyl ligand shows the usual asymmetry associated with the typical ring slippage responsible for the enhanced activity of indenyl metal compounds when compared with the analogous cyclo­penta­dienyl metal compound. There are three short Ir—C bonds of 2.210 (3), 2.190 (4) and 2.220 (3) Å and two long Ir—C bonds to the C atoms that are part of the fused six-membered ring of 2.349 (4) and 2.366 (3) Å for one of the independent mol­ecules [2.208 (4), 2.222 (3), 2.197 (4) Å for the short distances and 2.371 (3) and 2.358 (3) Å for the long distances in the second mol­ecule]. This results in both indenyl ligands being slightly kinked, with dihedral angles of 6.8 (4)° and 6.5 (4)°.