ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAgostic assistance to olefin insertion in alkylzirconocene cations: a molecular orbital study by the extended Hueckel methodMarc Heinrich Prosenc, Christoph Janiak, and Hans Herbert BrintzingerCite this: Organometallics 1992, 11, 12, 4036–4041Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December...

A staggered conformation with D5d symmetry is adopted by the lithocene anion, simplest metal-locene of main group metals a sandwich structure (see picture). [Cp2Li]− forms on treatment [CpLi] Ph4PCl in 2:1 molar ratio THF and isolated as Ph4P+ salt.

Twofold cryo N₂ cleavage by Ta₄⁺ clusters occurs <italic>via</italic> a multistep across edge-above surface (AEAS) mechanism submerged barriers.

Molecular based spintronic devices offer great potential for future energy-efficient information technology as they combine ultimately small size, high-speed operation, and low-power consumption. Recent developments in combining atom-by-atom assembly with spin-sensitive imaging characterization at the atomic level have led to a first prototype of an all-spin atomic-scale logic device, but very low working temperature limits its application. Here, we show that more stable device could be...

Abstract The syntheses of the arylphosphonic esters 3‐Br‐5‐ t Bu‐1‐{P(O)(O i Pr) 2 }C 6 H 3 ( 1 ), 5‐ Bu‐1,3‐{P(O)(O } C heteroleptic intramolecularly coordinated organostannylenes [4‐ Bu‐2,6‐{P(O)(O ]Sn X , = Cl; 4 Br; 5 I; SPh), organoplumbylene ]PbCl 7 and transition metal complex ]Sn(Cl)Cr(CO) 8 ) are reported. compounds were characterized by H, 13 C, 31 P, P MAS 119 Sn, Sn NMR spectroscopy, electrospray ionization mass spectrometry Mössbauer spectroscopy – single‐crystal X‐ray...

The organotin(II) salts [4-tBu-2,6-{P(O)(OiPr)2}2C6H2SnL]X (1: X=B[3,5-(CF3)2C6H3)]4; 2: X=BPh4) and [4-tBu-2,6-{P(O)(OiPr)2}2C6H2Sn(L)S]2(BPh4)2 (3) stabilized by two intra- one intermolecular donor–acceptor interaction are reported. Compound 1 contains the first N-heterocyclic carbene-stabilized cation (see scheme; DMAP=p-Me2NC5H4N). As a service to our authors readers, this journal provides supporting information supplied authors. Such materials peer reviewed may be re-organized for...

Making use of the inherent surface anisotropy different high index planes vicinal to low Au(111) orientation, one-dimensional polymers have been synthesized following established procedures from two precursor molecules. The successful polymerization both 4,4″-dibromo-p-terphenyl and 5,5′-dibromo-salophenato-Co(II) precursors into poly(p-phenylene) poly[salophenato-Co(II)], respectively, has confirmed by scanning tunneling microscopy energy electron diffraction. Angle-resolved photoemission...

Eine gestaffelte Konformation mit D 5d ‐Symmetrie hat das Lithocen‐Anion, einfachste Hauptgruppenmetallocen Sandwichstruktur (Bild rechts). [Cp 2 Li] − bildet sich bei der Umsetzung von [CpLi] Ph 4 PCl im Molverhältnis 2:1 in THF und kann als P + ‐Salz isoliert werden. magnified image

The initial step of the sol−gel process, that is, condensation two molecules silicic acid has been studied by means density functional theory. chosen system represents reagents under basic reaction conditions. Calculations were performed in gas phase as well employing a solvent model for aqueous solution. For both systems, intermediate with one pentacoordinated silicon center was found most stable structure. influence intramolecular hydrogen bonds on stability structure is discussed, and...

An intramolecularly P=O-coordinated dicationic diorganotin sulphide is presented. In solution, it shows a monomer-dimer equilibrium.

Surprising stability toward reductive elimination of diphenylsilane is exhibited by [(C5Me5)Co(SiHPh2)2(H)2] (1), which a rare example an organocobalt complex in the +5 oxidation state. This likely also accounts for its inactivity as hydrosilylation catalyst.

The strongly bent triple-decker structure shown on the right is exhibited by anion in [Cp3Cs2][PPh4], which obtained as a red crystalline compound reaction of CpCs with PPh4Cl. coordination sphere Cs cation filled additional intermolecular interactions neighboring [Cp3Cs2]+ ions and [PPh4]− ions.

The syntheses of the heteroleptic organostannylene chromium pentacarbonyl complexes [4-t-Bu-2,6-{P(O)(Oi-Pr)2}2C6H2(X)SnCr(CO)5] (2, X = ClO4; 3, OTf) and [4-t-Bu-2,6-{P(O)(Oi-Pr)2}2C6H2(L)SnCr(CO)5][ClO4] (4, L p-Me2NC5H4N; 5, Ph3PO) are reported. In complex 2, as its toluene solvate 2·C7H8, 3·0.5C7H8, perchlorate triflate anions coordinate tin atom at Sn–O distances 2.170(3) 2.178(3) Å, respectively. 4 however, anion is displaced from by 4-dimethylaminopyridine triphenylphosphane oxide...

While, the lithocene anion (Cp2Li-) can simply be generated by reacting 2 equiv of CpLi with PPh4Cl in THF, attempted synthesis sodocene under similar reaction conditions results crystallization [Cp-][PPh4+]. The structure consists "naked" Cp anions pinched between metaphenyl hydrogens phosphonium cations. An ansa-sodocene which two rings are bridged a −C(Me)2−C(Me)2− chain is obtained Me4C2(C5H4Na)2 1 THF. Its crystal shows disordered containing sandwiched sodium cation solvated THF...

Molecular networks: Chiral and metallized Salen molecules on a Cu(111) are investigated using local probe techniques (see figure). Whereas for the parent Co-Salen molecule no self-assembly is observed, in metal–organic complexes growth of large regular molecular networks achieved through target-oriented synthetic design electrostatic dipolar fields.

Molecular spintronics is currently attracting a lot of attention due to its great advantages over traditional electronics. A variety self-assembled molecule-based devices are under development, but studies regarding the reliability growth process remain rare. Here, we present method control length molecular spintronic chains and make their terminations chemically inert, thereby suppressing uncontrolled coupling surface defects. The temperature evolution chain formation was followed by X-ray...

Preparation of the dimeric starting compound [(C5H2tBu3-1,2,4)Fe(μ-Br)]2 (1) gave a small amount its green sodium bromide adduct [(C5H2tBu3-1,2,4)Fe(μ-Br)2Na(DME)2] (2). Reduction 1 under argon in presence diphenylacetylene yielded dark red [(C5H2tBu3-1,2,4)Fe(μ-CPh)]2 (3) containing two bridging benzylidyne ligands resulting from scission. The dicobalt methylidyne complex [{(C5HiPr4)Co}2(μ-CH)(μ-H)] (5) was obtained high yield reaction [(C5HiPr4)Co(μ-Cl)]2 (4) with equivalents...

For N(C(4)H(9))(4)B(6)H(7) a proton is shown to be localised above one of the faces distorted octahedron, and rhomboid rings are formed as by topological analysis charge densities.

Abstract The decomposition of formic acid catalyzed by a cationic hydridoplatinum tetradentate phosphane complex was studied NMR spectroscopy, isotope labeling and DFT calculations. In the initial step dihydrogen is formed reaction with hydrido ligand yielding platinum formate cation. formato then transformed to CO 2 β‐H transfer C–H bond Pt center revealing Pt–H complex. sequence illuminated deuterium C‐13 Pt–D as only product if deuterated used. an ensuing coordination site at assisted...

The disubstitution of 1,8-diiodonaphthalene (1) with cyclopentadienyl nucleophiles reveals 1,8-(dicyclopentadienyl)-naphthalene, which rapidly undergoes Diels-Alder reaction forming 1,8-(3a',4',7',7a'-tetrahydro-4',7'-methanoindene-7a',8'-diyl)-naphthalene (2). A subsequent retro-Diels-Alder in the presence sodium hydride yields disodium salt 1,8-(dicyclopentadiendiyl)-naphthalene 3. 3 was starting material to obtain paramagnetic bisnickelocene derivative 4, structure obtained by X-ray...

Infrared photodissociation (IR-PD) spectra of iron cluster dinitrogen adsorbate complexes [Fen(N2)m]+ for n = 8-20 reveal slightly redshifted IR active bands in the region 2200-2340 cm-1. These mostly relate to stretching vibrations end-on coordinated N2 chromophores, a μ1,end binding motif. Density Functional Theory (DFT) modeling and detailed analysis 13 are consistent with an icosahedral Fe13+ core structure. The first shell closure at (n,m) (13,12)-as recognized by accompanying paper on...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Reactivity of Cp2ZrH(OSO2CF3), a Soluble Monomeric Alternative for Schwartz's Reagent, the Solid-State Structure Its Dimer, [Cp2Zr(OSO2CF3)(.mu.-H)]2.cntdot.0.5THFGerrit A. Luinstra, Ursula Rief, Marc H. ProsencCite this: Organometallics 1995, 14, 4, 1551–1552Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April...

Abstract The donor‐acceptor complexes with a vinylogue monohydro sesquifulvalene and backbone of the type [(η 5 ‐C H )Ru{µ‐(η 4 )C 2 (η 6 7 )}ML](PF ) n [ = 0: ML none ( 1 ), Cr(CO) 3 ); 1: Ru(η 3a Me 3b )] 2: 6a 6b )], respectively, have been synthesised, spectroscopically structurally characterised. A charge‐shift correlation was carried out by means NMR spectroscopic studies an increased ground‐state interaction in order &lt; found. corresponding varies insignificant amount....

Charge density analysis reveals multi-centre bonds in the cluster, hydrogen bridges ammonia network, and dihydrogen bond between H(delta-) H(delta+); all observed one compound, [Li(NH3)4]2B6H6.2NH3.