Math & Science ⇒ Drawing Chemical structures with PPCHTEX package

[localghost]

[…] Now, how can I draw the molecule and save it as a TIFF? I mean can I save only the image in the tiff format and not all the page? […]

Why do you want to abandon the advantages of the vector format in favour of a picture in a pixel format?

Nevertheless you can produce a PDF document that only contains the actual image and convert it subsequently with your favourite image manipulation software.

Code: Select all

\documentclass{minimal}
\usepackage{chemfig}
\usepackage[active,tightpage]{preview}

\PreviewEnvironment{tikzpicture}
\setlength{\PreviewBorder}{1pt}
\setatomsep{2em}

\begin{document}
  \chemfig{%
    H_2C=[:-30]
    (-[:-90]CH_3)
    -[:30]
    (=[:90]O)
    -[:-30]\chembelow[1.2em]{O}{\hspace{4em}Cl^-}
    -[:30]
    -[:-30]
    -\chemabove[3pt]{N}{\hspace{-20pt}+}
    (-[2]CH_3)
    (-[6]CH_3)
    -CH_3
  }
\end{document}

[episanty]

For any newcomers wondering what Gianluca did to solve his problem, here's how:

Once you have downloaded the package, it will probably have a .dtx and a .ins file. Put both in a folder both you and MikTeX will be able to find (I usually put it in MikTeX 2.x/tex/latex/ in a folder Packages/, which has all the packages I install, and then in package_name/). Open the .ins file in TeXnicCenter and run it. This will create a .sty file there. if you already have one, start from here.

If it's a package you're just trying out for a single use, you can simply put the .sty file in the same folder as the file you're running and you can skip the rest.

In the start menu, find MikTeX and run settings. Then click on 'Refresh FNDB' (File-Name DataBase), and wait for the dialogue to close.

Then run your file on TeXnicCenter. It should run without a problem (at least, from that particular package).