I can't comprehend the problem because the code below compiles flawlessly. But also with the example you provided I only get some font warnings (after commenting the rather old
chemsym package).
Code: Select all
\listfiles
\documentclass[journal=joceah,manuscript=article]{achemso}
\setkeys{acs}{usetitle = true}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[version=3]{mhchem}
\usepackage{siunitx}
\usepackage{hyperref}
\SectionNumbersOn
\SectionsOn
\AbstractOn
\title[\texttt{achemso} a title]{A title}
\author{an author}
\email{email@hotmail.com}
\phone{5454}
\affiliation[A university]{university of}
\begin{document}
\ce{^{227}_{90}Th+}
\end{document}
Perhaps a matter of outdated packages. With the
\listfiles command I obtain the file list shown below (on my Linux system).
Code: Select all
*File List*
achemso.cls 2009/09/01 v3.3a Submission to ACS journals
article.cls 2007/10/19 v1.4h Standard LaTeX document class
size12.clo 2007/10/19 v1.4h Standard LaTeX file (size option)
xkeyval.sty 2008/08/13 v2.6a package option processing (HA)
xkeyval.tex 2008/08/13 v2.6a key=value parser (HA)
mciteplus.sty 2008/09/30 v1.1 enhanced mcite
fontenc.sty
t1enc.def 2005/09/27 v1.99g Standard LaTeX file
geometry.sty 2010/02/12 v5.0 Page Geometry
ifpdf.sty 2009/04/10 v2.0 Provides the ifpdf switch (HO)
ifvtex.sty 2008/11/04 v1.4 Switches for detecting VTeX and its modes (HO)
geometry.cfg
helvet.sty 2005/04/12 PSNFSS-v9.2a (WaS)
caption.sty 2009/10/09 v3.1k Customizing captions (AR)
caption3.sty 2009/10/09 v3.1k caption3 kernel (AR)
courier.sty 2005/04/12 PSNFSS-v9.2a (WaS)
float.sty 2001/11/08 v1.3d Float enhancements (AL)
graphicx.sty 1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)
graphics.sty 2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)
trig.sty 1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg 2009/08/28 v1.8 graphics configuration of TeX Live
pdftex.def 2009/08/25 v0.04m Graphics/color for pdfTeX
mathptmx.sty 2005/04/12 PSNFSS-v9.2a Times w/ Math, improved (SPQR, WaS)
setspace.sty 2000/12/01 6.7 Contributed and Supported LaTeX2e package
url.sty 2006/04/12 ver 3.3 Verb mode for urls, etc.
varioref.sty 2009/09/13 v1.4w package for extended references (FMi)
joceah.cfg 2009/09/01 v3.3a achemso configuration: J. Org. Chem.
natbib.sty 2009/07/16 8.31 (PWD, AO)
natmove.sty 2009/04/20 v1.1 Automatic citation moving with natbib
fontenc.sty
t1enc.def 2005/09/27 v1.99g Standard LaTeX file
inputenc.sty 2008/03/30 v1.1d Input encoding file
utf8.def 2008/04/05 v1.1m UTF-8 support for inputenc
t1enc.dfu 2008/04/05 v1.1m UTF-8 support for inputenc
ot1enc.dfu 2008/04/05 v1.1m UTF-8 support for inputenc
omsenc.dfu 2008/04/05 v1.1m UTF-8 support for inputenc
mhchem.sty 2007/05/19 v3.07 for typesetting chemical formulae
ifthen.sty 2001/05/26 v1.1c Standard LaTeX ifthen package (DPC)
calc.sty 2007/08/22 v4.3 Infix arithmetic (KKT,FJ)
twoopt.sty 2008/08/11 v1.5 Definitions with two optional arguments (HO)
amsmath.sty 2000/07/18 v2.13 AMS math features
amstext.sty 2000/06/29 v2.01
amsgen.sty 1999/11/30 v2.0
amsbsy.sty 1999/11/29 v1.2d
amsopn.sty 1999/12/14 v2.01 operator names
siunitx.sty 2009/09/21 v1.3a A comprehensive (SI) units package
array.sty 2008/09/09 v2.4c Tabular extension package (FMi)
xspace.sty 2006/05/08 v1.12 Space after command names (DPC,MH)
ts1enc.dfu 2008/04/05 v1.1m UTF-8 support for inputenc
si-prefix.cfg 2009/09/21 v1.3a siunitx: SI Multiple prefixes
si-named.cfg 2009/09/21 v1.3a siunitx: SI Named units
si-addn.cfg 2009/09/21 v1.3a siunitx: SI Additional units
si-prefixed.cfg 2009/09/21 v1.3a siunitx: SI Prefixed units
si-accepted.cfg 2009/09/21 v1.3a siunitx: SI Accepted units
si-physical.cfg 2009/09/21 v1.3a siunitx: SI Physically-measured units
si-abbr.cfg 2009/09/21 v1.3a siunitx: Abbreviated units
hyperref.sty 2009/10/09 v6.79a Hypertext links for LaTeX
ifxetex.sty 2009/01/23 v0.5 Provides ifxetex conditional
hycolor.sty 2009/10/02 v1.5 Code for color options of hyperref/bookmark (HO
)
xcolor-patch.sty 2009/10/02 xcolor patch
pd1enc.def 2009/10/09 v6.79a Hyperref: PDFDocEncoding definition (HO)
etexcmds.sty 2007/12/12 v1.2 Prefix for e-TeX command names (HO)
infwarerr.sty 2007/09/09 v1.2 Providing info/warning/message (HO)
hyperref.cfg 2002/06/06 v1.2 hyperref configuration of TeXLive
kvoptions.sty 2009/08/13 v3.4 Keyval support for LaTeX options (HO)
kvsetkeys.sty 2009/07/30 v1.5 Key value parser with default handler support
(HO)
bitset.sty 2007/09/28 v1.0 Data type bit set (HO)
intcalc.sty 2007/09/27 v1.1 Expandable integer calculations (HO)
bigintcalc.sty 2007/11/11 v1.1 Expandable big integer calculations (HO)
pdftexcmds.sty 2009/09/23 v0.6 LuaTeX support for pdfTeX utility functions (
HO)
ifluatex.sty 2009/04/17 v1.2 Provides the ifluatex switch (HO)
ltxcmds.sty 2009/08/05 v1.0 Some LaTeX kernel commands for general use (HO)
atbegshi.sty 2008/07/31 v1.9 At begin shipout hook (HO)
hpdftex.def 2009/10/09 v6.79a Hyperref driver for pdfTeX
ts1cmr.fd 1999/05/25 v2.5h Standard LaTeX font definitions
t1ptm.fd 2001/06/04 font definitions for T1/ptm.
supp-pdf.mkii
nameref.sty 2007/05/29 v2.31 Cross-referencing by name of section
refcount.sty 2008/08/11 v3.1 Data extraction from references (HO)
mhchem-prblm.out
mhchem-prblm.out
t1phv.fd 2001/06/04 scalable font definitions for T1/phv.
ot1ztmcm.fd 2000/01/03 Fontinst v1.801 font definitions for OT1/ztmcm.
omlztmcm.fd 2000/01/03 Fontinst v1.801 font definitions for OML/ztmcm.
omsztmcm.fd 2000/01/03 Fontinst v1.801 font definitions for OMS/ztmcm.
omxztmcm.fd 2000/01/03 Fontinst v1.801 font definitions for OMX/ztmcm.
ot1ptm.fd 2001/06/04 font definitions for OT1/ptm.
***********
I think you should not load so much packages because as you can see, the
achemso class does that on its own. Check those dependencies in the class manual.
Best regards and welcome to the board
Thorsten