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Dive into the research topics where Annabelle G. W. Hodson is active.

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Featured researches published by Annabelle G. W. Hodson.


Journal of Organometallic Chemistry | 1992

Structural properties of cationic molybdenum and tungsten allyl derivatives

Brian J. Brisdon; Michael Cartwright; Annabelle G. W. Hodson; Mary F. Mahon; Kieran C. Molloy

Abstract Cationic allyldicarbonyl derivatives of molybdenum and tungsten of the types [M(CO) 2 (η 3 -allyl)(L 3 )PF 6 (M = W, allyl = C 3 H 5 or 2-MeC 3 H 4 , L 3 =bis(2-pyridylmethyl)amine, bpma) and [M(CO) 2 (η 3 -allyl)(L 4 )]PF 6 (M = Mo or W, allyl = C 3 H 5 or 2-MeC 3 H 4 , L4 = tris(2-pyridylmethyl)amine, tpma) have been prepared, and their isomerism and dynamic behaviour in solution examined. In the solid state, [W(CO) 2 (η 3 -C 3 H 5 )(bpma)]PF 6 ( 1a ) exhibits an unsymmetric, and [Mo(CO) 2 (η 3 -C 3 H 5 )(tpma)]PF 6 ( 3 ) a symmetric, orientation of the N-donor set, which comprises two pyridyl rings and the central, exocyclic N of each ligand, with respect to the π-allyl group. The third bipyridyl ring of tpma in the latter complex is orientated away from the metal centre in the solid, but undergoes rapid exchange with N-donors within the coordination sphere at elevated temperatures in solution. Neither of the 2-MeC 3 H 4 analogues of 3 are dynamic under similar conditions, whereas the 2-MeC 3 H 4 analogue of 1 undergoes a facile trigonal twist rearrangement.


Journal of Organometallic Chemistry | 1984

Aqueous allylmolybdenum(II) chemistry

Brian J. Brisdon; Michael Cartwright; Annabelle G. W. Hodson

Abstract Dissolution of [MoCl(CO) 2 (η 3 -C 3 H 4 R)(NCMe) 2 ] (R = H or Me) in methanol yields yellow conducting solutions containing the [Mo(CO) 2 (η 3 -C 3 H 4 R)(HOMe) 3 ] + cations. The same species are formed on dissolution of [Mo(CO) 2 (η 3 -C 3 H 4 R)(NCMe) 3 ]BF 4 in methanol, and one of the cations (R = Me) has been isolated as its tetrafluoroborate salt. There is strong spectroscopic evidence that hydrated allyldicarbonylmolybdenum(II) cations [Mo(CO) 2 (η 3 -C 3 H 4 R)(H 2 O) x ] + are present on dissolution of [MoCl(CO) 2 (η 3 -C 3 H 4 R)(NCMe) 2 ] in deoxygenated water, and treatment of these solutions with bi- and tridentate ligands yields neutral complexes [MoCl(CO) 2 (η 3 -C 3 H 4 R)L 2 ] (R = H or Me; L 2 = 2,2′-bipyridine (bipy) or 2,2′-bipyridylamine (bpa)), and cationic species [Mo(CO) 2 (η 3 -C 3 H 4 R)L 3 ] + (R = H or Me; L 3 = diethylenetriamine (dien) or bis(2-pyridylmethyl)amine (bpma)) respectively. The latter were isolated as their hexafluorophosphate salts. Addition of Ph 4 AsCl to basic methanolic solutions of [MoCl(CO) 2 (η 3 -C 3 H 4 R)(NCMe) 2 ] causes the precipitation of the anionic molybdenum derivatives Ph 4 As[Mo 2 (CO) 4 (η 3 -C 3 H 4 R) 2 (μ-OMe) 3 ] (R = H or Me).


Inorganica Chimica Acta | 1987

The synthesis of six- and seven-coordinate molybdenum and tungsten(II) dicarbonyl complexes containing monodentate phosphine ligands

Brian J. Brisdon; Annabelle G. W. Hodson

Abstract On passing a stream of dry N 2 gas through a solution of Mo(CO) 3 (PR 3 ) 2 X 2 (PR 3 = PEtPh 2 , PMe 2 Ph or PEt 2 Ph, X = Br; PR 3 = PMePh 2 , X = Cl, Br or I) in acetonitrile at room temperature, or W(CO) 3 - (PR 3 ) 2 X 2 (PR 3 = PMePh 2 or PMe 2 Ph, X = Br) in boiling acetonitrile, the yellow, monomeric 7- coordinate dicarbonyls M(CO) 2 (NCMe)(PR 3 ) 2 X 2 are formed in high yields. The nitrile ligand is readily displaced from M(CO) 2 (NCMe)(PR 3 ) 2 X 2 (M = Mo, PR 3 = PEtPh 2 or PEt 2 Ph, X = Br; PR 3 = PMePh 2 , X = I; M = W, PR 3 = PMePh 2 , X = Br) by passing a vigorous stream of N 2 gas through a solution of these complexes dissolved in chlorinated or ketonic solvents yielding new, highly coloured 6-coordinate d 4 M(CO) 2 (PR 3 ) 2 X 2 derivatives.


Journal of Materials Chemistry | 1994

Polymer-mediated crystallisation of inorganic solids: calcite nucleation on the surfaces of inorganic polymers

Kim K. W. Wong; Brian J. Brisdon; Brigid R. Heywood; Annabelle G. W. Hodson; Stephen Mann

Nucleation of calcite from supersaturated calcium hydrogancarbonate solution has been achieved on the surfaces of poly(dimethylsiloxane) films formed by cross-linking in the presence of catalytic quantities of dibutyltindilaurate or zinc octanoate. Films containing high concentrations of the diorganotin catalyst produced, in addition to calcite, amorphous calcium silicate and calcium silanolate under similar conditions. Polar functional groups incorporated into the polysiloxane network served to promote calcite growth, but prolonged heating of all films at 90 °C rendered them inactive.


Journal of Organometallic Chemistry | 1988

Synthesis of molybdenum complexes containing η3-bonded trans-butadienyl ligands: crystal structure of[Mo(2,2′-bipyridine)(CO)2-

Brian J. Brisdon; Annabelle G. W. Hodson; Mary F. Mahon; Kieran C. Molloy

Abstract Reaction of Ph 4 P[Mo(2,2′-bipyridine)Cl(CO 3 ] with 1,4-dichlorobut-2-yne in the presence of primary or secondary aliphatic amines gives high yields of neutral molybdenum complexes containing 2-substituted η 3 -bonded trans -butadienyl ligands. The crystal structure of the perfluorocarboxylate derivative [Mo(2,2′-bipyridine)(CO) 2 (η 3 -CH 2 C(CONHMe)CCH 2 ) (O 2 CC 3 F 7 ] has been determined.


Journal of The Chemical Society-dalton Transactions | 1993

Preparation and characterisation of seven-co-ordinate trifluoroacetate and oxalate complexes of molybdenum(II) and tungsten(II)

Brian J. Brisdon; Annabelle G. W. Hodson; Mary F. Mahon; Kieran C. Molloy

The 1 : 1 reaction of sodium trifluoroacetate with either [MBr2(NCMe)(CO)2(PR3)2](M = Mo or W, PR3= PMe2Ph or PMePh2) or [MBr2(CO)2(PPh3)2](M = Mo or W) formed the mononuclear complexes [MBr(O2CCF3)(CO)2(PR3)2] containing a bidentate carboxylate ligand. Addition of a second equivalent of the carboxylate salt generated [M(O2CCF3)2(CO)2(PR3)2] in which the oxygen-donor ligands adopt one bidentate and one monodentate bonding mode. Single-crystal X-ray diffraction studies of [MoBr(O2CCF3)(CO)2(PPh3)2] confirm a 4 : 3 polytopal form. The treatment of [MBr2(NCMe)(CO)2(PR3)2](M = Mo, PR3= PMePh2; M = W, PR3= PMe2Ph or PMePh2) or [MBr2(CO)2(PPh3)2](M = Mo or W) with a suspension of sodium oxalate in acetone yielded the complexes [{MBr(CO)2(PR3)2}2(µ-C2O4)]. The tungsten species [{WBr(CO)2(PMe2Ph)2}2(µ-C2O4)] crystallises in two forms both of which contain a planar oxalate bridge linking two seven-co-ordinate metal centres, but have different 4 : 3 geometries. The triangular face of the polygon in each of the three structures is occupied by a bromine atom and two oxygens of a carboxylate group, and the quadrilateral face by pairs of carbonyl and phosphine ligands.


Organometallics | 1991

Synthetic and molecular orbital study of .eta.3(3e)-butadienyl complexes of molybdenum

Brian J. Brisdon; Robert J. Deeth; Annabelle G. W. Hodson; Christopher M. Kemp; Mary F. Mahon; Kieran C. Molloy


Advanced Materials | 1993

Polymer‐mediated crystallization of inorganic solids: Calcite nucleation on poly(organosiloxane) surfaces

Brian J. Brisdon; Brigid R. Heywood; Annabelle G. W. Hodson; Stephen Mann; Kim K. W. Wong


Inorganic Chemistry | 1990

Synthetic, electrochemical and structural studies of monoalkyne complexes of molybdenum(II) and tungsten(II)

Brian J. Brisdon; Annabelle G. W. Hodson; Mary F. Mahon; Kieran C. Molloy; Richard A. Walton


Organometallics | 1994

Synthesis and Reactivity of [MoCl(CO)2(.eta.3-CH2C(COCl)C:CH2)L2] (L2 = 2,2'-Bipyridine, 1,10-Phenanthroline): Crystal Structure of [Mo(.eta.2-ClCH2C.tplbond.CCH2Cl)(CO)(O2CCF3)2(1,10-phenanthroline)]

Brian J. Brisdon; Annabelle G. W. Hodson; Mary F. Mahon

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