Redox active polyiron complexes with higher dimensional spacers, the tetrairon complex with the two-dimensional tetra(ethynylphenyl)ethene spacer, (C=C)[p-C(6)H(4)-C triple bond C-FeCp*(dppe)](4), and the diiron complex with the three-dimensional spacer (pseudo-m-[2,2]paracyclophane)[C triple bond C-FeCp*(dppe)](2), are prepared, and their performance as molecular wires is evaluated on the basi...

The synthesis and structural characterization of dicationic selenium and tellurium analogues of the carbodiphosphorane and triphosphenium families of compounds are reported. These complexes, [Ch(dppe)][OTf](2) [Ch = Se, Te; dppe = 1,2-bis(diphenylphosphino)ethane; OTf = trifluoromethanesulfonate], are formed using [Ch](2+) reagents via a ligand-exchange protocol and represent extremely rare exa...

In the title compound, [NiCl(2)(C(14)H(32)P(2))]·2C(12)H(9)N, the neutral [Ni(dppe)Cl(2)] complex [dppe is 1,2-bis-(diisopropyl-phosphan-yl)ethane] consists of a tetracoordinated Ni(2+) cation and has a crystallographic twofold axis passing through the metal atom and the mid-point of the CH(2)-CH(2) bond of the dppe ligand. The metal atom shows slight tetra-hedral distortion from an ideal squar...

Transition metal alkynyl complexes containing perfluoroaryl groups have been prepared directly from trimethylsilyl-protected mono- and di-ethynyl perfluoroarenes by simple desilylation/metallation reaction sequences. Reactions between Me(3)SiC[triple bond, length as m-dash]CC(6)F(5) and RuCl(dppe)Cp' [Cp' = Cp, Cp*] in the presence of KF in MeOH give the monoruthenium complexes Ru(C[triple bond...

We report in this communication the study of the intramolecular electron transfer through a 2,7-diethynylfluorenyl spacer in the Fe(II)/Fe(III) mixed-valent (MV) complex [(η(2)-dppe)(η(5)-C(5)Me(5))FeC≡C(2,7-C(21)H(24))C≡CFe(η(5)-C(5)Me(5))(η(2)-dppe)][PF(6)] (1[PF(6)]). The complex is generated in situ by comproportionation from its homovalent dinuclear Fe(II) and Fe(III) parents (1 and 1[PF(6...

Using synchrotron grazing-incidence x-ray diffraction (GIXD) and reflectivity, the in-plane and out-of-plane structure of mixed ganglioside-phospholipid monolayers was investigated at the air-water interface. Mixed monolayers of 0, 5, 10, 20, and 100 mol% ganglioside GM(1) and the phospholipid dipalmitoylphosphatidylethanolamine (DPPE) were studied in the solid phase at 23 degrees C and a surfa...

A series of four platinum(II) complexes bearing two tetrathiafulvalene acetylide ligands coordinated either cis or trans to the metal center are reported: cis-Pt(bipy)(C≡CMe(3)TTF)(2), cis-Pt(tBu(2)bipy)(C≡CMe(3)TTF)(2), cis-Pt(dppe)(C≡CMe(3)TTF)(2) and trans-Pt(PPh(3))(2)(C≡CMe(3)TTF)(2). The X-ray diffraction studies of the four complexes are reported and discussed. The electrochemical invest...

Two Ni(II) complexes with the formula [{Ni(dppf)}2{(L1)2}](PF6)2 (Ni-I) and [{Ni(dppe)}2{(L1)2}](PF6)2 (Ni-II) were prepared by reacting [Ni(dppf)Cl2] [Ni(dppe)Cl2] (dppf = 1,1′-Bis-(diphenylphosphino)ferrocene; dppe 1,2-Bis-(diphenylphosphino)ethane) secondary amine piperazine derived ligand disodium bis-(dithiocarbamate)piperazine ((piper(dtc)2 L1) counter anion PF6−. These characterized elem...

In 2- und 5-Position einer Phenylenbrücke eines schwach koppelnden gemischtvalenten [{Cp*(dppe)RuC≡C}2(μ-1,3-C6H4)]+ Komplexes hat ein OMe-Substituent nur geringen Einfluss auf dessen Elektronenstruktur. 4-Position hingegen erhöht dieser die elektronische Delokalisation im Grundzustand sowie Intensität des IVCT-Überganges. Schwingungsfrequenzen TDDFT-Berechnungen (LH20t-D3(BJ), def2-SVP, COSMO ...

It has been shown that the bis-chelated complex Au(dppe)2CI, dppe diphenylphosphinoethane and derivatives are active against a series of tumor cell lines [1]. Later, closely related silver diphosphine complexes were shown to be cytotoxic against B melanoma cells in vitro and P 388 leukemia in mice [2]. Furthermore, Cu-diphosphine complexes are also biologically active [3]. The diphosphine ligan...