Substitution Reactions of Solvated Metal Ions

New complexes (Bu4N)2[Mo6X8(n-C3F7COO)6] (X = Br, I) display extraordinarily bright long-lived red phosphorescence both in solution and solid phases, with the highest emission quantum yields and the longest emission lifetimes among hexanuclear metal cluster complexes of Mo, W and Re, hitherto reported

Highly luminescent complexes [Mo6X8(n-C3F7COO)6]2- (X=Br, I).

Spectroscopic and mass spectrometric methods for the characterisation of metal clusters

Octahedral molybdenum cluster cores [Mo6I8]4+ have been attached in apical positions to p- and n-type Si(111) surfaces through complexation with a pyridine-terminated organic monolayer (2 × 1014 cm−2), which was previously covalently bound to hydrogen-terminated Si(111). This grafting procedure resulted in about a 4 nm thick Mo6-terminated layer. Similar XPS results were found for p- and n-type samples, suggesting that the grafting efficiency and composition of the resulting layers do not depend significantly on the doping type of the surface. The cluster footprint of 10 nm2 indicates a fairly dense molecular packing on the Si(111) surface. The electrochemistry of such Mo6-modified surfaces in acetonitrile was characterized by a single irreversible oxidation peak at 0.92 V versus saturated calomel electrode (SCE) and flat band potential Efb values of −0.55 ± 0.05 V and 0.04 ± 0.05 V for the modified n- and p-type surfaces, respectively. The derivatization of silicon surfaces by Mo6 introduces surface stat...

Electrochemical and Charge Transport Behavior of Molybdenum-Based Metallic Cluster Layers Immobilized on Modified n- and p-Type Si(111) Surfaces

A new hexanuclear rhenium cluster complex with six terminal acetate ligands: Synthesis, structure, and properties of K4[Re6S8(CH3COO)6]·8H2O

Preparation of tetrabutylammonium octa-μ3-bromohexa(trifluoromethanesulfonato)octahedro-hexamolybdate (2−), (Bu4N)2[Mo6Br8i(CF3SO3)6a] and other derivatives containing the Mo6Br84+ core

The anation reaction of Co(CN) 6 3- with Cr(NH 3 ) 5 H 2 O 3+ yields the neutral, binuclear complex Cr(NH 3 ) 5 -NC-Co(CN) 5 , which was isolatcd and characterized. The value of the overall equilibrium constant, K T , for its formation, is 110±2 M -1 at 50.0 o C with values of 11.2±0.6 kJ mol -1 and 74±2 J K -1 mol -1 for ΔH o and ΔS o respectively.

Dennis C. Gaswick

Papers

Preparation of tetrabutylammonium octa-μ3-bromohexa(trifluoromethanesulfonato)octahedro-hexamolybdate (2−), (Bu4N)2[Mo6Br8i(CF3SO3)6a] and other derivatives containing the Mo6Br84+ core

Kinetics and mechanism of the anation reaction of the aquapentaamminechromium(III) ion with the hexacyanocobaltate(III) ion