TeX/Latex - bibtex

Hola mi nombre es Toto y tengo un problema con BibTeX. El archivo .tex es este:

cite{brust_synthesis_1994}.
ibliographystyle{plain}
ibliography{bibi}

y el .bib es este

@article{brust_synthesis_1994,
title = {Synthesis of thiol-derivatised gold nanoparticles in a two-phase Liquid-Liquid system},
url = {http://dx.doi.org/10.1039/C39940000801},
abstract = {Using two-phase (water-toluene) reduction of AuCl4- by sodium borohydride in the presence of an alkanethiol, solutions of 1-3 nm gold particles bearing a surface coating of thiol have been prepared and characterised; this novel material can be handled as a simple chemical compound.},
journal = {Journal of the Chemical Society, Chemical Communications},
author = {Mathias Brust and Merryl Walker and Donald Bethell and David J. Schiffrin and Robin Whyman},
year = {1994},
pages = {801-802}
},
la cuestión es que cuando compilo me da el siguiente error:

! Missing endcsname inserted.
<to be read again>
protect
l.86 cite{brust_synthesis_1994}
.
?
LaTeX Font Info: Try loading font information for U+msa on input line 86.
("C:Program FilesMiKTeX 2.5 exlatexamsfontsumsa.fd"
File: umsa.fd 2002/01/19 v2.2g AMS font definitions
)
LaTeX Font Info: Try loading font information for U+msb on input line 86.

("C:Program FilesMiKTeX 2.5 exlatexamsfontsumsb.fd"
File: umsb.fd 2002/01/19 v2.2g AMS font definitions
)
LaTeX Font Info: Try loading font information for U+lasy on input line 86.

("C:Program FilesMiKTeX 2.5 exlatexaseulasy.fd"
File: ulasy.fd 1998/08/17 v2.2e LaTeX symbol font definitions
)
! Extra endcsname.
@ifundefined ...dafter ifx csname #1endcsname
elax expandafter @firs...
l.86 cite{brust_synthesis_1994}
.
?

LaTeX Warning: Citation `brust$ elax _{s}$ynthesis$ elax _{1}$994' on page 3
undefined on input line 86.

(tes.bbl [3

]

LaTeX Warning: Empty `thebibliography' environment on input line 3.

) [4

] (tes.aux)

LaTeX Warning: There were undefined references.

)
Que puede estar pasando? cual puede ser la solución?

Muchas gracias por su ayuda!!!