Substituted metal carbonylsXVIII. rhenium 1,1′-bis(diphenylphosphino)ferrocene (DPPF) complexes derived from [Re2(CO)9]. Crystal structures of two isomorphous pentametallic [M2(CO)9]2(μ-dppf) (M  Mn, Re) and trimetallic Re2(CO)9(dppfO) complexes

Interaction of N-nitrosamines with binuclear copper complexes for luminescent detection

Cu(I) from tetrakis(acetonitrile)copper(I) hexafluorophosphate ([Cu(MeCN)₄]PF₆) was complexed with five structurally related phosphines containing N-heterocycles. The interactions between the resulting complexes and some N-nitrosamines were studied using X-ray crystallography as well as emission spectroscopy. Upon complexation, three phosphine ligands bridge two Cu(I) centers to give paddlewheel type structures that displayed a range of emission wavelengths spanning the visible region. N-Nitrosodimethylamine (NDMA) was shown to coordinate to one of the two copper centers in some of the paddlewheel complexes in the solid state and this interaction also quenches their emissions in solution. The influence of the weakly coordinating anion on crystal and spectroscopic properties of one of the paddlewheel complexes was also examined using tetrakis(acetonitrile)copper(I) perchlorate ([Cu(MeCN)₄]ClO₄) as an alternative Cu(I) source. Similarly, copper(II) perchlorate hexahydrate (Cu(ClO₄)₂·6H₂O) was used for complexation to observe the impact of metal oxidation state on the two aforementioned properties. Lastly, the spectroscopic properties of the complex between Ph₂P(1-Isoquinoline) and Cu(I) was shown to exhibit solvent dependence when the counterion is ClO₄^-. These Cu(I) complexes are bench stable solids and may be useful materials for developing a fluorescence based detection method for N-nitrosamines.

Spectroscopic, structural and computational analysis of [Re(CO)3(dippM)Br]n+ (dippM = 1,1′-bis(diiso-propylphosphino)metallocene, M = Fe, n = 0 or 1; M = Co, n = 1)

[Re(CO)₃(dippf)Br]⁺: the first structurally characterized complex of a coordinated bis(phosphino)ferrocenium ligand.

1-(4-Bromo-phen-yl)ferrocene

In the title compound, [Fe(C₅H₅)(C₁₁H₈Br)], the distance of the Fe atom from the centroids of the unsubstituted and substituted cyclo­penta­dienyl (Cp) rings is 1.644 (1) and 1.643 (1) Å, respectively. The ferrocenyl moiety deviates from an eclipsed geometry, with marginally tilted Cp rings and an inter­planar angle between the Cp and benzene rings of 13.0 (4)°. The crystal structure is stabilized by C—H⋯π inter­actions between a cyclo­penta­dienyl H atom and the cyclo­penta­dienyl ring of a neighbouring mol­ecule.

Probing the importance of the hemilabile site of bis(phosphine) monoxide ligands in the copper-catalyzed addition of diethylzinc to N-phosphinoylimines: discovery of new effective chiral ligands

The hemilabile ligand Me-DuPHOS(O) 2 has proven to be a successful ligand for the copper-catalyzed addition of diethylzinc to N-phosphinoylimines. The corresponding alpha-chiral amines were obtained in high yields (80-98%) and enantiomeric ratios (19.0:1 to 99.0:1 er). Furthermore, this Cu* 2 catalytic system has been shown to be effective in the addition of diethylzinc to nitroalkenes and in the reduction of beta,beta-disubstituted vinyl phenyl sulfones. This paper describes a general structure/selectivity study in which the three ligand subunits (chiral phospholane-linker-labile coordinating group (Z)) are systematically modified and tested in the copper-catalyzed addition of diethylzinc to the N-phosphinoylimine 1 derived from benzaldehyde. This study led to the discovery of a new class of effective chiral ligands that combine a chiral phospholane unit and an achiral phosphine oxide.

Synthesis and Coordination Behaviour of a Phosphanyl(vinyl)ferrocene

Donor properties of 1-(diphenylphosphanyl)-1'-vinylferrocene (1) were investigated in a series of reactions with palladium(II), rhodium(I), and copper(I) compounds. In all complexes obtained, compound 1 coordinates exclusively as a monodentate phosphorus donor, giving trans-[PdCl2(1-κP)2] (3) with [PdCl2(cod)], [PdCl(LNC)(1-κP)] (4) with [{Pd(LNC)}2(μ-Cl)2], and trans-[RhCl(CO)(1-κP)2] (5) with [{Rh(CO)2}2(μ-Cl)2] (cod = cycloocta-1,5-diene, LNC = 2-[(dimethylamino)methyl-κN]phenyl-κC1). Copper(I) precursors CuI and [Cu(MeCN)4]PF6 reacted with 1 in a similar manner, yielding at appropriate molar ratios heterocubane [(μ3-I)4{Cu(1-κP)}4] (6) and the bis(phosphane) complex [Cu(MeCN)(1-κP)2]PF6 (7), respectively. The structures of 1-(diphenylthiophosphoryl)-1'-vinylferrocene (2), 3, 4·CHCl3, 6·C6H6, and 7 have been determined by single-crystal X-ray diffraction.