Brian Nicholson
University of Waikato, Chemistry, Emeritus
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Convenient syntheses of the square-bipyramidal cluster, [Co4(�-4-GeMe)2(CO)11] and the formation of [Co4(�4-GeMe)-{�4-GeCo(CO)4}(CO)11] and [Co4{�4-GeMn(CO)5}-{�4-GeCo(CO)4}(CO)11]: new Ge2Co4 clusters containing the square-bipyramidal skeleton; and the crystal structure of [Co4(�4-GeMe){�4-GeCo(...more
The compound [Co 4 (µ 4 GeMe) 2 (CO) 11] 1a, results directly in high yield from the reaction of GeMeH 3 with [Co 4 (CO) 12] under mild conditions. It also forms near-quantitatively from the smooth decarbonylation of [Co 2 {µ-Ge (Me) Co... more
The compound [Co 4 (µ 4 GeMe) 2 (CO) 11] 1a, results directly in high yield from the reaction of GeMeH 3 with [Co 4 (CO) 12] under mild conditions. It also forms near-quantitatively from the smooth decarbonylation of [Co 2 {µ-Ge (Me) Co (CO) 4} 2 (CO) 6] 3, ...
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Page 1. DALTON J. Chem. Soc., Dalton Trans., 1997, Pages 43774384 4377 Synthesis and reactivity of the ferrocene-derived phosphine [Fe(η-C5H5)- {η-C5H4CH2P(CH2OH)2}] Nicholas J. Goodwin,a William Henderson ...
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Chalcones [(E)-1,3-diarylprop-2-en-1-ones] react with benzyltetracarbonylmanganese under reflux in petroleum spirit to give two types of cyclomanganation products. The first, involving metallation at the alkenyl β-carbon of the enone, are... more
Chalcones [(E)-1,3-diarylprop-2-en-1-ones] react with benzyltetracarbonylmanganese under reflux in petroleum spirit to give two types of cyclomanganation products. The first, involving metallation at the alkenyl β-carbon of the enone, are derivatives of [[1-phenyl-2-phenylcarbonyl-κO]ethenyl-κC1]tetracarbonylmanganese, while the second type, manganated at the aryl ring ortho-carbon, are derivatives of [2-[3-phenylprop-2-en-1-onyl-κO]phenyl-κC1]tetracarbonylmanganese. In general, more “alkene-manganated” than “ring-manganated” product is formed, with the ratio influenced significantly
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Methods are described for characterising neutral metal carbonyl complexes using electrospray mass spectrometry, by converting them into ions with suitable reagents. Ionisation techniques included addition of OMe–generating [M+... more
Methods are described for characterising neutral metal carbonyl complexes using electrospray mass spectrometry, by converting them into ions with suitable reagents. Ionisation techniques included addition of OMe–generating [M+ OMe]–species, addition of ...
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The sequential conversion of [OsBr(cod)Cp*] (9) to [OsBr(dppe)Cp*] (10), [Os([=C=CH2)(dppe)Cp*]PF6 ([11]PF6), [Os(C triple bond CH)(dppe)Cp*] (12), [{Os(dppe)Cp*}2{mu-(=C=CH-CH=C=)}][PF6]2 ([13](PF6)2) and finally [{Os(dppe)Cp*}(2)(mu-C... more
The sequential conversion of [OsBr(cod)Cp*] (9) to [OsBr(dppe)Cp*] (10), [Os([=C=CH2)(dppe)Cp*]PF6 ([11]PF6), [Os(C triple bond CH)(dppe)Cp*] (12), [{Os(dppe)Cp*}2{mu-(=C=CH-CH=C=)}][PF6]2 ([13](PF6)2) and finally [{Os(dppe)Cp*}(2)(mu-C triple bond CC triple bond C)] (14) has been used to make the third member of the triad [{M(dppe)Cp*}2(mu-C triple bond CC triple bond C)] (M = Fe, Ru, Os). The molecular structures of []PF6, 12 and 14, together with those of the related osmium complexes [Os(NCMe)(dppe)Cp*]PF6 ([15]PF6) and [Os(C triple bond CPh)(dppe)Cp*] (16), have been determined by single-crystal X-ray diffraction studies. Comparison of the redox properties of 14 with those of its iron and ruthenium congeners shows that the first oxidation potential E1 varies as: Fe approximately Os < Ru. Whereas the Fe complex has been shown to undergo three sequential 1-electron oxidation processes within conventional electrochemical solvent windows, the Ru and Os compounds undergo no fewer than four sequential oxidation events giving rise to a five-membered series of redox related complexes [{M(dppe)Cp*}2(mu-C4)]n+ (n = 0, 1, 2, 3 and 4), the osmium derivatives being obtained at considerably lower potentials than the ruthenium analogues. These results are complimented by DFT and DT DFT calculations.
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A novel methodology for the synthesis of complexes containing long carbon chains linking metal centres: molecular structures of {Ru(dppe)Cp*}2(�-C14) and {Co3(�-dppm)(CO)7}2(�3:�3-C16)Electronic supplementary information (ESI) available: synthetic procedures and characterisation data for Fc(C?C)2...more
Elimination of AuX(PR3)(X = halogen, R = Ph, tol) occurs readily in reactions between compounds containing C(sp)- or C(sp2)-X bonds and alkynyl or polyynyl gold(I) complexes; this reaction has been applied to the syntheses of complexes... more
Elimination of AuX(PR3)(X = halogen, R = Ph, tol) occurs readily in reactions between compounds containing C(sp)- or C(sp2)-X bonds and alkynyl or polyynyl gold(I) complexes; this reaction has been applied to the syntheses of complexes containing a variety of metal centres linked by C(n) chains (n up to 16).
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Detailed spectroscopic data have been obtained for arsonoacetic acid, As(CH2COOH)O3H2, and its barium and sodium salts. The X-ray crystal structure of the free acid is isomorphous with phosphonoacetic acid. Reduction gave the As(I)... more
Detailed spectroscopic data have been obtained for arsonoacetic acid, As(CH2COOH)O3H2, and its barium and sodium salts. The X-ray crystal structure of the free acid is isomorphous with phosphonoacetic acid. Reduction gave the As(I) compound arsenoacetic acid, (AsCH2COOH)n which was shown by ESI-MS to contain cyclic species based on As-As bonds, with n mainly 3-6. The X-ray crystal structure of the hexamer was determined as the pyridine solvate and shown to have a hexacyclic As6 ring in a puckered chair conformation, with –CH2COOH groups in equatorial sites, each H-bonded to a pyridine molecule in the lattice.