Homoleptic coordination of arsenine C5H5As to molybdenum(0) and tungsten(0): further observations on the eta1,eta6-dilemma.

By means of metal-atom ligand-vapor cocondensation (CC) hexa(eta1-arsenine)molybdenum (11) and hexa(eta1-arsenine)tungsten (12) have been prepared; in the molybdenum case, the sandwich complex bis(eta6-arsenine)molybdenum (10) has been isolated as the primary product. The structure of 12 follows from a single-crystal X-ray diffraction study. Based on the results of CC synthesis, chromium binds to arsenine in the eta6-mode exclusively, molybdenum features both options eta1 and eta6, and for tungsten only eta1 coordination is observed.

Trans-dichloro-tris([5]trovacenyl)stannate(iv), electro- and magneto-communication across a Cl-Sn-Cl backbone.

Reaction of [5]lithiotrovacene (TVC-Li) with tin dichloride affords the triradical complex (THF)(3)Li(+)[(TVC)(3)SnCl(2)](-) which was characterized by X-ray crystallography, cyclic voltammetry, EPR spectroscopy and magnetic susceptometry; redox splittings deltaE(1/2) ("electrocommunication") and the exchange parameters J(EPR) and J(chi) ("magnetocommunication") attest to inter vanadium interactions mediated by the central tin atom.

Magnetic face-to-face interaction and electrocommunication in chromium sandwich compounds.

The reaction of [{(C5Me5)CrCl2}2] with [2.2](1,4)cyclophane gave [(C5Me5)Cr{[2.2](1,4)cyclophane}] (1) and [(C5Me5)Cr{[2.

On a novel coordination mode of phosphinine C5H5P.

In an unprecedented coordination mode two phosphinines simultaneously bridge a Mn-Mn bond and the latter with two Mn(CO)3 fragments; the distortion of the resulting central heterobicyclo[1.1.0]butane unit follows from the Mn(18VE) requirement.

Electro- and magnetocommunication in [5,5]ditrovacenyls, [(eta7-C7H7)V(eta5-C5H4-X-eta5-C5H4)V(eta7-C7H7)], mediated by the spacers X = (Z)-CH=CH-, (E)-CH=CH-, > C=CH2, -CH2CH2-, and -CH2-.

Five new paramagnetic dinuclear complexes containing [5]trovacenyl groups, (eta7-C7H7)V(eta5-C5H4-), have been prepared and characterized, including by single-crystal X-ray diffraction. As intervening spacers, ethenediyl units in the geminal and vicinal (Z)- and (E)-bridging modes as well as methanediyl and ethanediyl units have been included with the aim of studying their propensity to transmit electric and magnetic information. It is found that redox splitting of consecutive electron-transfer steps is resolved for reduction (0-->1- -->2-) only, unsaturation of the C2 bridge not being requisite, since the -CH2CH2- spacer also gives rise to a small redox splitting.

Di([5]trovacenyl)ethyne, di([5]trovacenyl)butadiyne, and di-1,4-([5]trovacenylethynyl)benzene: electrocommunication and magnetocommunication mediated by --C triple bond C--, --C triple bond C--C triple bond C-- and --C triple bond C--C6H4--C triple bond C-- spacers.

The synthesis of dinuclear derivatives of trovacene (eta7-C7H7)V(eta5-C5H5) (1.) is reported, in which ethynyl (6..

1,2,4,5-Tetra([5]trovacenyl)benzene: an organometallic tetraradical displaying pronounced electro- and magnetocommunication.

The organometallic tetraradical 1,2,4,5-[(eta)7-C7H7)V(all eta]5-C5H4)]4C6H2 has been prepared and structurally characterized. The isotropic EPR spectrum displays 29 a(51V) hyperfine lines, the intensity distribution slightly deviating from binomial. Exchange coupling therefore approaches the strong exchange limit, J(ortho) not equal to J(meta) not equal to J(para) greater or approximately 50 a(51V) with a(51V)= 0.