A package for drawing 2D molecules using the TikZ package.

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4
votes
1answer
3k views

How can I fix this overfull hbox?

\documentclass[10pt]{article} \usepackage{chemfig} \usepackage[margin=1.2in]{geometry} \newcommand{\chem}{\setatomsep{2em}\chemfig} \begin{document} \begin{itemize} \item[--] 1$^\circ$ Alcohol ...
4
votes
2answers
329 views

Forked arrows with chemfig

How can one make a forked arrow in chemfig? Semantically it is exactly opposite to \merge command but seems like it's not implemented in a package. I don't have any experience with TikZ graphics but ...
4
votes
2answers
253 views

Two arrows in a row in chemfig

I have a problem drawing two arrows in a row in chemfig. I need : A->->B but when I place two arrows, I get a space between them which I don't need: A-> ->B How to fix that? Any help is ...
4
votes
1answer
207 views

How can I place H_2 on top of a N ? (aspartic and glutammic metal complexes)

Please consider the following code \documentclass{article} \usepackage{chemfig} \newcommand*\circleatom[1]{\tikz\node[circle,draw,fill=green!30]{\printatom{#1}};} \begin{document} ...
4
votes
1answer
322 views

How to annotate this chemical scheme using chemfig package?

To depict a chemical scheme with more than one reactant and more than one product, I used the handy package chemfig. I found some issues though annotating the below chemical reaction in a better way. ...
4
votes
2answers
114 views

Generate pdf document consisting in just one figure

Related to this question I am trying to generate a figure using package chemfig. Actually, my problem is that the lower part of the figure is cropped, specifically the H under the N. This is the ...
4
votes
1answer
74 views

Issue with cram bonds in chemfig

Using chemfig v1.1a, cram bonds are not drawn well in a way similar to the issue found in previous versions. Edit: My precise question here would be: does anyone know how to fix this? Or, worst case, ...
4
votes
1answer
119 views

Problem with mesomeric effect in chemfig

I'm trying to draw mesomeric effect for a molecule using chemfig I would like to create something like this: From the documentation page (see chapter 11 "Representing electron movements")seems easy ...
4
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2answers
149 views

How to move bond position with chemfig package?

I'm using this code to generate chemical structure with chemfig package: \documentclass[12pt,a4paper]{standalone} \usepackage{chemfig} \begin{document} \setatomsep{2.5em} ...
4
votes
1answer
106 views

Reaction sheme for Saponification with chemfig: horizontal and vertical placement

I want to draw the formation of a fat molecule like shown in the picture below I tried with hspace/vspace and yshift: \documentclass[margin=2cm]{standalone} \usepackage{chemfig} \begin{document} ...
4
votes
1answer
198 views

Text and figure alignment in chemfig reaction scheme?

I am new to chemfig, and I am trying to illustrate a reaction using the code: \documentclass{article} \usepackage{chemfig} \begin{document} \schemestart \chemname ...
4
votes
1answer
351 views

How to line up a chemical structure in the table (chemfig)?

I have a table which has three rows of chemical structures. The structures in the second row are not lined up with the first and third rows. I tried to use \vspace to bring the structure down but it ...
4
votes
1answer
68 views

chemfig Horizontal Aligment

I need to align some molecules according to this picture. 1st Point of alignment should be the beginning of the ring, 2nd point of alignment should be the 'N' on the right-hand chain. The bound to ...
4
votes
1answer
100 views

Distance between arrow and reaction product

Please tell me, How I can reduce a distance between arrow and feed substances. I want the same distances at all three directions. To make it clearer, I explain: I drew the side substances as a massive ...
4
votes
1answer
222 views

How do we mirror a reversible reaction arrow in chemfig

In Chemfig, the reversible reactions are represented with a double harpoon. The top one goes from the left to the right, the bottom from the right to the left. One can rotate this double arrow. But I ...
4
votes
1answer
264 views

chemfig: Colored atoms don't align, and how to draw bonds to an electric charge?

So I want to show the ionic interaction between a molecule and a charged element. But when I use color to highlight a part of the molecule, the bond alignment is no longer correct. The first example ...
4
votes
1answer
305 views

Relative positioning of Lewis electrons in chemfig

I am defining a submolecule in chemfig (2,2'-bipyridine) and I want to show the lone pair of electrons on both the Nitrogens. (For those who care, I wish to show a coordination bond between the lone ...
4
votes
1answer
741 views

joining atoms in chemfig. Two adjacent molcules

This is a follow up of drawing cellulose and aligning monomers in chemfig. I'm trying to refine the structure adding some hydrogen bonds. No problem with the intra-chain ones, but I cannot figure ...
4
votes
1answer
556 views

How to modify just some nodes' styles in chemfig

In the following molecular drawing, I want to only circle the rightmost OH of the first molecule and the leftmost H of the second, to show that they are the ones that are involved in the formation of ...
4
votes
1answer
114 views

Color functional groups in chemfig syntax

I want to color simple functional groups in organic molecules using the chemfig package. I've come up with a solution that achieves what I want (MWE), but I find it very cumbersome. I thought it could ...
4
votes
1answer
353 views

How to line up the arrow and structure in chemfig

I have the following problems: in the first reaction scheme the arrow is too high and I would like to bring it a little down. in the second reaction scheme the third chemical structure (after the ...
4
votes
1answer
302 views

chemfig: reaction above arrow

I want to typeset a small reaction above a reaction arrow inside a scheme. Putting a \subscheme{} into the first of argument of \arrow unfortunately breaks the layout. Should I just try to position ...
4
votes
1answer
188 views

Anchor point seems incorrect for Chemfig package

I'm trying to use chemfig to draw a basic schematic for enzymatic browning and have encountered a problem. In the bottom reaction (bottom right to bottom left) quinone is formed by the enzyme (denoted ...
3
votes
2answers
279 views

Creating ethane using \chemfig

I was tinkering with chemfig package. I created the macros \documentclass{article} \newcommand{\lmethyl}{C(-[2]H)(-[4]H)(-[6]H)} \newcommand{\rmethyl}{C(-[2]H)(-[6]H)-H} ...
3
votes
2answers
169 views

Labeling Species of a Chemical Reaction

My code is: \documentclass[12pt,letterpaper]{report} \usepackage{blindtext} \usepackage[utf8]{inputenc} \usepackage[margin=1in]{geometry} \usepackage{titlesec} \setcounter{secnumdepth}{5} ...
3
votes
3answers
190 views

Drawing chemical reactions

I am trying to draw reactions like this I tried it like this \documentclass[11pt]{article} \usepackage[version=4]{mhchem} \usepackage{chemfig} \begin{document} \ce{ \chemfig{CH_3-CH ...
3
votes
4answers
206 views

Chemical structures drawing: {table} vs \chemfig

I write a chemical structure as a table. Please help me understand, How can I reduce the distances between the rows and columns in a table? This is the structure of the zeolite and would like to make ...
3
votes
1answer
206 views

In chemfig, grouping with \color ineffective, unlike \textcolor

Some strange behaviour which contradicts the documentation was encountered when creating a figure of 5-cafeoylquinic acid with chemfig. It is stated in the manual that The atoms are displayed in ...
3
votes
1answer
930 views

List of schemes, caption and lining up the reaction in chemfig

I have several question regarding LaTeX and chemfig. My first question is : how to create a list of schemes similar to \listoftables and \listoffigures so I can add my reaction schemes to newly ...
3
votes
1answer
28 views

chemfig, how to do these wavy markings?

I am trying to reproduce this: So far I have: \documentclass{memoir} \usepackage{tikz} \usepackage{chemfig} \usetikzlibrary{decorations.pathmorphing} \begin{document} ...
3
votes
1answer
142 views

Simpler way to create chemical graphs using chemfig

chemfig is a great package to draw molecules. But it's not very fast. I am searching for a software to create chemfig code of chemical graphs (molecules, reactions etc.). It would be great if it is ...
3
votes
2answers
317 views

chemfig: align multiple reactions

How can I align multiple reactions to the reaction arrow using chemfig? In the MWE, I want to align the two reactions to the arrow. \documentclass{minimal} \usepackage{chemfig} \begin{document} ...
3
votes
1answer
136 views

How to change the default value bond length to an absolute value in chemfig?

Chemfig allows you to set bond length in the second argument of the bond, like -[,2] (a multiple of 2 to the default value). How to set the value of bond length for an absolute value (like 5mm), ...
3
votes
1answer
326 views

Representing movement of a single electron

I would like to represent the movement of a single electron in a reaction mechanism (grignard-reaction) Is there a predefined arrow (something like a harpoon) for that in chemfig? Or does anyone have ...
3
votes
1answer
177 views

Chemfig reaction to wide for twocolumn

For a paper I have to describe certain reactions. I am using the chemfig package to do this. The paper has to be two columns and this is where it goes wrong. When I compile this reaction: ...
3
votes
2answers
50 views

Right aligning atom in chemfig

I'm using chemfig (perhaps improperly) for relational algebra graphs. Here, for example, is a simple one: \documentclass{article} \usepackage[italian]{babel} \usepackage[utf8]{inputenc} ...
3
votes
2answers
125 views

How can I draw an ellipse in benzene molecule?

Can you help me to draw an dash ellipse in benzene molecule and adsorption bond from the molecule center to the metal? \documentclass{article} \usepackage[utf8]{inputenc} \usepackage{chemfig} ...
3
votes
1answer
189 views

Using the mhchem and chemfig packages in conjunction

I am trying to write a chemical reaction in which I want to include a chemical structure. I am having some trouble regarding alignment and bond length. Here is a minimal working example: ...
3
votes
2answers
217 views

chemfig chemname alignment in schemes

After careful consultation of the chemfig documentation and looking up a couple of questions here, I am struggling to find a solution to get these correctly aligned. They are inside a box which is ...
3
votes
1answer
18 views

Write the charge of an ion as an apex outside the square brackets with chemfig

I have the structure of the nitrate ion written down in chemfig and I'd like to add its charge as an apex outside the square brackets (see below). Is there a correct way to do it or do I just ...
3
votes
2answers
79 views

Showing Chemical reaction on websites?

I have been writing latex code for showing chemical reactions thorugh chemfig . Now i want to show it in website . The only solution i find is to capture screenshot crop it and publish it ? Is there ...
3
votes
2answers
72 views

How can I solve the vertical alignment with a CH2 and a ring?

I draw a picture like this: You may find that the right side of the molecule is under the base line. I know this problem is 'Vertical alignment' mentioned in P25 of the offical documantaion. After I ...
3
votes
1answer
108 views

Molecular angle question (Tikz/Chemfig)

Based on the answer from erik, I am able to make a molecule diagram with labels for bond length and angles. But one difficulty appeared. The last angle should be between the two oxygen bondings - but ...
3
votes
1answer
69 views

why bounding box dimensions are inherited from previous chemfig molecules in beamer?

I'm sure my problem is related to my OS but I can't tell why and how. Last year I was on Debian wheezy, while at present I'm on Mint Rebecca. I'm revising my slides for the lessons and, after ...
3
votes
1answer
59 views

How to set departure atom with chemfig lewis macro?

I'm drawing a molecule and its radicals with chemfig. For the molecule, the bond departs from the C of CH_3, but in the radicals, the departing bond is centered. I tried splitting the \lewis structure ...
3
votes
1answer
160 views

How do I refer in the text to a molecule drawn with chemfig?

I just found chemfig fantastic for drawing even difficult molecules. Now, I have a question: how can I put under the molecule a line with a caption like "Figure #: captiontext" and, even more ...
3
votes
1answer
198 views

Can I annotate the links in chemfig?

chemfig is really great chemical picture editor, but just one problem doesn't allow me to continue the work. In the picture below, you see the chemical picture from the book with numbered links and ...
3
votes
1answer
168 views

How to cross off the structure in chemfig

I do not know how to cross off the structure in chemfig. It should look like on the picture Thanks! Here is my sample code: \documentclass[12pt,doublespacing,letterpaper]{report} ...
3
votes
1answer
597 views

Chemfig: how to write vertically?

I am trying to create a reaction scheme using chemfig. I can not understand though how to have text written vertically. Say my set of reaction A+B -> AB, A+C ->AC If I start writing \startscheme ...
3
votes
1answer
74 views

group of molecules

I want to reproduce this figure, i used chemfig package, need help to get many arrows from one molecules. Thank you \documentclass[french,12pt,oneside,openright]{memoir} \usepackage[utf8]{inputenc} ...