Peter Harverson

4-tert-butylphenyl solubilized oligopyridines

Abstract Soluble 4- tert -butylphenyl substituted derivatives of 2,2′:6′,2″-terpyridine, 2,2′:6′,2″:6″,2″′-quaterpyridine, 2,2′:6′,2″:6″,2″′:6″′,2″″-quinquepyridine and 2,2′:6′,2″:6″,2″′:6″′,2″″:6″″,2″″′-sexipyridine have been prepared. The ligands and their metal complexes are more soluble than unsubstituted analogues, but the introduction of the bulky substituent does not perturb any metal centred processes.

CONVERGENT SYNTHESIS OF AN OCTADECARUTHENIUM METALLODENDRIMER

Abstract A convergent approach to the synthesis of metallodendrimers leads to the formation of an octadecaruthenium species from the raaction of a nucleophilic trinuclear building block with hexakis (bromomethyl)benzene.

The coordination chemistry of 4′-(4-tert-butylphenyl)-2,2′ : 6′,2″-terpyridine—a solubilising oligopyridine

Abstract The preparation of a solubilised 2,2′ : 6′,2″-terpyridine ligand is described together with the characterisation of an unexpected intermediate. Homoleptic complexes of the solubilised ligand 4′-(4- tert -butylphenyl)-2,2′ : 6′,2″-terpyridine, 1 , with cobalt(II), cobalt(III), ruthenium(II), iron(II) and nickel(II) have been prepared. The ligand is slightly electron releasing and solubilises the complexes in organic media.

Synthesis and coordination chemistry of 4′,4″-disubstituted 2,2′:6′,2″:6″,2‴-quaterpyridines and crystal and molecular structures of nickel(II) and cobalt(II) complexes

A range of symmetrical 4′,4″-disubstituted 2,2′:6′,2″:6″,2‴-quaterpyridines has been prepared and their coordination behaviour with metal ions having a preference for tetrahedral and octahedral geometries has been studied. The new ligands reacted with copper(I) and silver(I) salts to form dinuclear double-helical complexes; reaction with nickel(II) or cobalt(II) salts gave mononuclear species. The crystal structures of three mononuclear complexes are reported and demonstrate that the ligand binds in a tetradentate mode to the equatorial plane of the octahedral metal centre.

A convergent approach to heteroheptanuclear star complexes

Abstract A 2,2′-bipyridine (bpy) ligand has been prepared which bears two {Ru(tpy) 2 }-containing substituents; key synthetic steps involve ‘organic’ reactions of ruthenium complexes. The new bpy ligand has been used in the convergent assembly of heteronuclear Ru 6 Fe and Ru 6 Co complexes.

CONVERGENT SYNTHESIS OF HETEROHEXANUCLEAR AND HETERODECANUCLEAR HELICOCENTRIC METALLOSTARS

Abstract New 2,2′:6′,2″:6″,2‴-quaterpyridine (qtpy) ligands have been prepared which bear two or four {Ru(tpy) 2 } containing substituents; key synthetic steps involve “organic” reactions of functionalised ruthenium complexes. The new qtpy ligand has been used in the convergent spontaneous assembly of double-helical Ru 4 M 2 and Ru 8 M 2 (M=Ag or Cu) complexes.

Convergent and divergent approaches to metallocentric metallodendrimers

Approaches to metallodendrimers which have a metal as the central growth point are developed; although a divergent methodology was not successful a convergent approach allows the facile synthesis of species such as 514+ and 614+ in high yield.

Adsorption of ruthenadendrimers to silica–titania surfaces studied by optical waveguide lightmode spectroscopy (OWLS)

Kinetic analysis of the assembly of metallodendrimers at silica–titania surfaces shows that the deposition mode strongly depends on the bulk concentration.

A new convergent strategy for high-nuclearity metallodendrimers

A convergent methodology for the synthesis of metallodendrimers is described in which the key step is the reaction of a metal-complex containing a coordinated nucleophile with a multifunctional electrophile; using this methodology, linear and starburst tetra-, hexa- and nona-ruthenium metallodendrimers are prepared.