• Melting Point Of Acetic Acid
• Highest Paying

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These guidelines are necessarily quite technical, and are intended for editors with some experience of drawing chemical structure diagrams and reaction schemes. For a less technical overview of the issues involved, see Wikipedia:Molecular structure diagram.

• 3Suggested molecule editor settings
• 43D Models
• 6Generating SVG files

General[edit]

• Support The following videos demonstrate how to use the Marvin chemical editor when answering some questions in Mastering. Unified homolytic and heterolytic examples demonstrate putting the basics together. Note: Depending on your security settings, you may be asked Whether you want to run the Marvin application. You'll see the message.
• 74 Draw-bar pull vs. 75 CHAPTER V DIRECT DETERMINATION OF CARBURETER ACTION THE ANEMOMETER. 81 Barometric and temperature correction.... 81 Application to carbureter measurements.... 81 CHAPTER VI THE CHEMISTRY OF CARBURETION * INTRODUCTION.

Chemical structures and reaction schemes should conform to the following:

• Images should be drawn with a molecule editor, never freehand
• ACS settings should be used for both structures and reaction schemes. These settings are all available as templates in the chemical drawing programs ChemDraw, Isis/Draw and ChemSketch. Please use sans-serif fonts like Arial.
• Indexes used for labelling must be superscripted: R¹-CH₂-R² (not R₁-CH₂-R₂)
• Do not include English text in images: this prevents their reuse in other languages.
• Methyl groups should be denoted with “CH₃”, not “Me”, unless they are bound to a heteroatom (for example, “NMe₂”). This is to avoid confusion with “Me”, the German abbreviation for metal (Metall). The use of “Et”, “Pr”, etc., is discouraged. By default, “Ph” denotes phenyl and “X” halogen.
• The use of explicit methyl groups in the following cases is a stylistic choice, and both forms are generally acceptable on Wikipedia:
  • methyl groups attached to a ring or as branches in a longer carbon chain;
  • methyl groups at the end of a carbon chain.
• If labels for structures are desired, consider the use of bolded numerals, which are language-neutral.
• Information about stereocenters and stereoisomerism should be included if available (e.g. by using wedged bonds).
• For articles on racemates, the stereochemistry should be depicted as undefined (straight and not wavy nor wedged bonds attached to the stereogenic center).

Technical considerations[edit]

• Images should be uploaded in PNG or SVG format. PNG images should be around 600–720 dpi. A transparent background should be used. Images should still be readable when scaled down to 450 pixels to prevent conflicts with the Chembox.
• SVG images are desirable because they are infinitely scalable, while remaining compact. However, support for SVG images among common molecule editors is limited, and may not be rendered correctly on Wikipedia.
• Scanned images tend to be of poor quality. Scanned images of books or journals may violate copyright. Do not upload them.

Suggested molecule editor settings[edit]

ACS templates are available in most chemical drawing programs.

Drawing in ChemDraw[edit]

• From the “File” menu, choose “Apply document settings from → ACS Document 1996”.
• Draw the structure, and save it as a ChemDraw file.
• If you drew the structure before applying any settings, then you need to select the object, open the “Object” menu and choose “Apply document settings from → ACS Document 1996”.
• Then save it as a PNG file, to be read by an image editor such as GIMP or IrfanView (see below for details).

The ACS settings are as follows:

• Chain angle: 120 degrees
• Bond spacing: 18% of length
• Bond length: 0.508 cm (14.4 pt)
• Bold width: 0.071 cm (2 pt)
• Line width: 0.021 cm (0.6 pt)
• Margin width: 0.056 cm (1.6 pt)
• Hash spacing: 0.088 cm (2.5 pt)
• Captions: Arial 10 pt
• Atom labels: Arial 10 pt
• Bond angles and length: “fixed” is recommended

Also recommended: For minus symbols on atoms, change the font for the minus symbol to “Symbol” for clarity.

Drawing in MarvinSketch[edit]

The following two changes in font may be performed by going to File → Document Style)

• Font: Arial
• Font scale: 18
• Carbon labels: Never (which may be done by going to Edit → Preferences → Structure)
• View → Colors: Monochrome

The following three may be performed by going to Edit → Preferences → Display:

• Double bond spacing: 0.18
• Wireframe bond thickness: 0.06
• Circled charge labels font: Arial

Whereas this last one may be performed by going to Edit → Preferences → Bonds

• Down wedge orientation: Points Upward (Daylight)

Stereocenter display may be enabled by choosing View → Stereo → R/S Labels: All.

Drawing in Accelrys Draw[edit]

Note: Accelrys Draw 4.1 is available free to educators and students (with registration) from Accelrys. Unfortunately, the “Export” commands are unreliable, often producing unreadable image files (TIFF, JPG, WMF). Image file may be generated by using MS' Copy feature, followed by a Paste into another program. Photoshop Elements or Paint may be used. The image can then be saved as a .PNG file. A further possibility in Windows is to use the Shift-PrtSc key combination to copy a screenshot into the copy buffer. Paste that into MS Paint and crop it. Printing to an EPS file and converting to SVG works OK - see SVG section below.

• From the “Options” menu choose “Read Journal or Custom Settings” then “JACS”. These ACS settings are as shown above for ChemDraw.
• From the “Options” setting choose “Settings” then under “Chemical Drawing” select hydrogen labels “On hetero” in place of “None”. Under “Line/Fill Arrow” select “Transparent” in place of “Opaque”. If necessary “Apply settings”.
• Draw the desired structure/scheme, then (assuming export as TIFF or WMF fails) print using a high quality laser printer.
• Scan in the image using 300 dpi.
• Open using an image editor such as The Gimp or Irfan View, then add border and save as described below.
• It is also possible to use the lasso tool to select your molecule, and then copy and paste it into another program, such as Adobe Photoshop.
• MOL files can be converted SVG graphics format by Mol2Svg^[1].

Drawing in SymyxDraw[edit]

The same link as IsisDraw will allow a free download of SymyxDraw 3.2. This is similar to IsisDraw but some of the “bugs” have been sorted out, so a TIFF export is now possible.

Drawing with WinDrawChem[edit]

There is a free, open source program called WinDrawChem (the Windows version of XDrawChem) that appears to work well. Link

Drawing in BKChem[edit]

There is a free, open source program called BKchem. You can save the following configuration files to ~/.bkchem under Linux or C:Documents and Settings<username>application databkchem (XP) or C:Users<username>application databkchem (Vista / Windows 7) to get configuration according to Wikipedias Manual of Style.

standard.cdml:

prefs.xml :

3D Models[edit]

CORINA online[edit]

CORINA online is an easy to handle 3D-model generator of molecules, with the objective to execute the structural determination within a particular low time investment.This advantage is bought by a divergence from the ideal geometry. For instance, the program works with presets. To which extend these divergences are tolerable depends on the individual case and on quality demands. CORINA is not “foolproof”. Pseudochirality centers may turn out as pitfalls (e.g. amines that are chiral in protonated form). These specifics are to be considered in the SMILES code, i.e. the correct relative energy minimum is to be manually assured.

Generating PNG files[edit]

Most molecule editors cannot produce .PNG images directly with the requirements outlined above. The image processing step also allows a canvas (margin) to be added (this is usually absent from the molecule editor output).

• Save as: TIFF black/white bitmap with a resolution of 720 dpi (small molecules) to 240 dpi (large molecules) (in ChemDraw under the Options button in the Save as TIFF dialog).

ChemDraw / ChemBioDraw 11 (2007) cannot save black and white TIFF images. Therefore, save as a 1200 dpi greyscale TIFF image and decrease the color depth to 2 bit (black and white) during image processing.

• Add canvas of about 5% to each side (test it, usually around 30 pixels) (Photoshop: Image:Canvas Size, relative, 10% width, 10% height)
• Save as a PNG black/white bitmap (color depth: 2) with transparent background.

Generating SVG files[edit]

SVG files are preferred, because they are smaller in filesize, can generate high quality images for printing and are easier to translate if text is added to mechanism.

Using ChemDraw 12 for Windows[edit]

• Draw the structure in ChemDraw 12 or later
• Go to File → Save As
• Choose Scalable Vector Graphics (*.svg) as the save as format.

ChemDraw exports svgs with a white background. You may use the vbs script at User:Smallman12q/Scripts/Transperify to make the background transparent. Another option is to open the file with Inkscape, right-click on the structure and select 'Ungroup', then click anywhere on the white background and hit delete, then save again.

Using ChemDraw 12 for Mac[edit]

• Draw the structure in ChemDraw 12 or later
• Go to File → Save As
• Choose PDF as the save as format
• Upload the resulting PDF to the Texterity FreeSVG converter and you should end up with a very light SVG.
• Alternative free SVG converter: Online SVG converter.

Using MarvinSketch[edit]

• Click File → Export to Image.
• Change the filename extension to “.svg” or choose the file type Scalable Vector Graphics / SVG (*.svg *.svgz), and click Save.
• Set the Scale value to 112.
• Check the Use Alpha Channel box and, finally, click Save.

There tends to be an unreasonably large margin left around the diagram's extents, so it is often a good idea to crop the image in a vector program such as Inkscape before uploading it. Leave a small margin of 1.6 pt.

Using Inkscape[edit]

This method works only if your molecule editor is able to export files in Windows Metafile format. For example, ChemDraw supports this, as does ChemSketch.

• Draw the structure in your molecule editor, and save it as a Windows Metafile (.wmf), Enhanced Metafile (.emf), or Encapsulated Postscript (.eps).
• Open the saved file in Inkscape.
• Resize the picture about 400%, then click to File→Document Properties→Fit page to selection.
• Select the molecule and click Path→Object to path. (to workaround commons:librsvg bugs with fonts)
• Click File→Save as to save file as Plain SVG.

Using Scribus[edit]

Alternative (but little more complex) way to generate high quality and small size SVG files. One needs to download and install both Scribus and Ghostscript to archieve EPS to SVG conversion.

• Draw the structure in your molecule editor (ideally change the settings to give a molecule twice the size as the JACS standard or change the size to 200% before next step), and save it as an Encapsulated PostScript file (.eps) - many of the Apple print drivers (an Apple printer is not required) that print to a PostScript printer can be set to EPS in the print dialog options, thus printing to a file generates an suitable EPS file (HP printers with PS in the name e.g. 'HP LaserJet 2300 Series PS' also work - ideal for Windows 7 where Apple drivers are hard to find)
• Open the PostScript file in Scribus. Note the image size and set the paper size to about 10px larger than the largest dimension.
  • NB:SymyxDraw will usually add a full page rectangle to the drawing - ungroup, select rectangle and delete, then select all and re-group structure.
• Go to File → Export → Save page as SVG.

MOL2SVG Converter[edit]

MDL/Symyx MOL file can be converted to Wikipedia recommended SVG graphics format by Mol2Svg converter freeware ^[1]. However, note the following issues with Mol2Svg:

1. It will construct bond lines from the co-ordinates of the mol file - i.e. all bonds join up without a gap for the hetero atoms, it will then place a white rectangle over the bond join, and a black letter. This looks OK when shown on a white background, but not on a coloured background.
2. It takes data from the mol file and fits it to the size of svg requested (in the main screen), so one needs to adjust the svg size and font size to get the desired ratio of bond length to font size.
3. The letters are placed at the bottom of the rectangle described above (in No.1). This is incorrect, they need to be in the centre.

A workaround of the issues is to:

• Do several trial conversions altering the svg and font size until correct appearance (view in Inkscape).
• Then edit in Inkscape - Ungroup drawing, and carefully move letters up (Alt-UpArrow - for fine movement) to correct place
• If planning to use a non-white background then either add a large white rectangle that covers the whole molecule (and then place behind it) OR pre-colour the small blanking rectangles behind the letters.

Uploading and copyright[edit]

Melting Point Of Acetic Acid

Please upload images to Wikimedia Commons and not to the English Wikipedia. This enables images to be used in other Wikipedia languages and other Wikimedia projects and makes updating images much easier, it also saves someone else having to move the structure to Commons later. It is also simpler to find images in the Commons category structure compared to Wikipedia. To upload images to the Commons, you must be a registered user there. Due to the single user login, you might already have an account on Commons (check here).

As usual, uploaded images must have a correct copyright tag: please add {{PD-chem}} - this will add the text This image of a simple structural formula is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship. Images released under “non-commercial use only” licences are not accepted and will be deleted without warning, as will images without a tag.

The easiest way is to use this pre-filled upload form. Please complete the form and one or more specific categories (normally subcategories of Category:Chemical compounds).

Alternative method:

• Go to the upload page (you may want to bookmark this)
• Paste this text to the summary template:

For ChemDraw:

For BKchem:

• Replace the “..” with the Wikipedia article name and your username, respectively
• The date is already set to the current date
• Browse to your file and select it. Optionally, change the final image name in the box below
• Do not select a licensing from the upload form — the tags are already in the pasted text
• Upload the file
• Change your structure to the most specific subcategory (or subcategories) of Category:Chemical compounds

Templates[edit]

Highest Paying

The following templates can be used on Wikipedia and Commons to mark wrong or poor chemical structures:

See also[edit]

External links[edit]

• Graphical Representation of Stereochemical ConfigurationIUPAC Recommendations 2006. A guide to drawing chemical structures. Covers topics such as the use of wedged and wavy bonds, bond angles, and perspective.

Notes[edit]

I have ChemDraw Professional (Chem Office 2015) provided by my institute. I just started PhD at another University, but I think I had the same version where I did my Master's and had the same problems.

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I have the perfect setup of the toolbars I use the most. But they keep disappearing or rearranging whenever I close and open the program. It's really annoying to always have to either go through the drop-down menus for quick edits or to have to set it up all again if I have to draw more.

Does anyone else have the same problems? Do you know how to fix it?

(I'm using a lot of hotkeys, which covers most of my use. But some things you can't do a hotkey for, like contract/expand label, paste exact mass etc.)