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17

The following examples uses that the tikz code for the arc uses a center node named arccenter. The tikz option argument for the \draw command of the arc can be used with option late options to put a label in the center: \documentclass{article} \usepackage{chemfig} \begin{document} \chemfig{ N**[0,-144,dash pattern=on 2pt off 2pt, late ...

16

Here are the fish you wanted, that I caught with texdoc chemfig. \documentclass{article} \usepackage{chemfig} \begin{document} \setatomsep{2em} \setdoublesep{.3em} \renewcommand*\printatom[1]{\ensuremath{\mathsf{#1}}} \chemfig[line width=1pt] { HO-*6(-=-(-(-[::90]CH_3)(-[::-90]CH_3)-*6(-=-(-OH)=-=))=-=) } \end{document} Now your turn to fetch the ...

9

Something like this? MWE: \documentclass{article} \usepackage{chemfig} \begin{document} \chemfig{P(=[2,0.7]O)(-[:-30,0.8]C_{5}H_{11})(-[:150,0.8]C_{5}H_{11}O)(-[:210,0.8]C_{5}H_{11}O)} \end{document} To specify an angle you have to use the notation [:<angle>], while to specify a custom length for the bonds you have to use [,<length>], so ...

7

You had a syntax error with a final } bracket missing on the last compound. Apart from that to put a label on an arrow use the general form \arrow{->[up][down]} To colour atoms, use {\color{red}H}. However, in a number of situations, such as ends of bonds, you need to write {}|{\color{red}H} instead. \documentclass[12pt,letterpaper]{report} ...

7

The \chemfig command has two optional arguments. The manual says this: The \chemfig command takes two optional arguments; their syntax is as follows: \chemfig[<opt1>][<opt2>]{<molecule code>} The first optional argument <opt1> contains tikz instructions which will be passed to the tikzpicture environment in which the ...

7

I'd use an invisible bond pointing to the center of the ring (with a relative angle) to place the plus. Something like (-[::126,,,,draw=none]\oplus), possibly scaled a bit. On the other hand I do like Heiko's answer better than mine :) \documentclass{article} \usepackage{chemfig} \begin{document} \chemfig{ R-[:36]N **[216,360,dash pattern=on 2pt off ...

7

Here are two ideas: \documentclass{article} \usepackage{chemfig} \definesubmol{ring}{(-[::-60]=^[::60]-[::60])=_[::60]-[::-60]=_[::-60]} \definesubmol{ring2}{(**6(------))-[,,,,draw=none]-[,,,,draw=none]} \begin{document} \chemfig{-!{ring}-!{ring}-!{ring}} \chemfig{-!{ring2}-!{ring2}-!{ring2}} \end{document}

7

I actually figured this issue out by digging through the 83 pages of the chemfig manual. Here's the code I've changed and the following result: \chemleft[\chemfig{\lewis{,H}\pol{+}-\lewis{2:,O}\pol{-}(-[6]\lewis{,H}\pol{+})-\lewis{,H}\pol{+}}\ind\ind\chemright]^{+}

7

I've contacted Christian Tellechea, the maintainer of the chemfig package. Hi Christian, there is currently a discussion about bound joints in chemfig on tex.stackexchange: Ugly bond joints in chemfig Are you aware of that problem? Is it a chemfig-problem or a TikZ problem? I would really appreciate it if you could participate in the ...

6

I have tried to "fix" the problem. It is not really a "bugfix" (since there is no bug) but a dirty workaround. It seems to work : The beta version needs more testing. If you can't wait (or want to test it), you can download it here. The zip file contains the package source itself (chemfig.tex), a small test file (test.tex) and the pdf manual, compiled ...

6

It works with two set of curly braces (changed the color to blue): \documentclass{article} \usepackage{color} \usepackage{chemfig} \begin{document} \chemfig{ [:30]HO-*6(-=-(-=[::-60]-[::60](=[2]O)-[:-30]{\color{red}O}> *6(--(([6]<OH)-(-[:30]OH)=[6] {{\color{blue}O}} )--(<:OH)-(<HO)-) )=-(-HO)=) } \end{document} ...

6

I was really a conflict between babel with czech and chemfig. I found the following solution on LaTeX community: \documentclass[oneside,czech]{book} \usepackage{babel} \usepackage{chemfig} \usepackage{etoolbox} \pretocmd\schemestart{\shorthandoff{-}}{}{} \apptocmd\schemestop{\shorthandon{-}}{}{} \begin{document} \schemestart A \arrow(aa--bb) B ...

6

Yes, I have an idea: \documentclass{article} \usepackage{chemfig} \begin{document} \definesubmol\cc{**6(---!\ff-!\ee--)} \definesubmol\dd{**6(-!\ee--!\ff---)} \definesubmol\ee{**6(-----)} \definesubmol\ff[(-^{-}OOC)]{(-COO^{-})} \chemfig{Cu^+(-[1]N([0,.5]!\cc))(-[3]N([:180,.5]!\dd))(-[5]N([:180,.5]!\cc))(-[7]N([:0,.5]!\dd))} \end{document}

6

I'd draw the bold single bonds with the line-width command -[,,,,line width=2pt]. A bold double bond can be achieved by drawing a bold single bond backwards (angle = 180°) over the double bond: -[::180,,,,line width=2pt]. Here is an example: \documentclass[a4paper]{scrreprt} \usepackage[utf8]{inputenc} \usepackage{chemfig} ...

5

You can use \chembelow[<dim>]{<code>}{<stuff>}. I have used siunitx, in addition, to write those percentages. \documentclass[12pt,letterpaper]{report} \usepackage{chemfig,chemmacros} \usepackage{siunitx} \begin{document} \begin{center} \schemestart \chembelow[1.5ex]{\chemfig{CH_4}}{} \chemsign{+} \chemfig{Cl_2} ...

5

I propose the following solution. I've made a number of changes: First of all I find your use of enumerate a bit strange. It looks like you want equation numbers for your reactions. If that's it then I'd use an equation environment. With the class option leqno its numbers will be placed on the left. I'd still use chemfig's \schemestart ... \schemestop ...

5

chemfig's molecules can get a default rotation by specifying an angle as option first in the molecule: \chemfig{[:<angle>]...} Choosing the right angle will do the trick here: \documentclass{article} \usepackage{chemfig} \definesubmol{imidazole}{N*5(=-{NH}-(-)=-)} % imidazole ring \begin{document} ...

5

You can: \documentclass{article} \usepackage{chemfig} \makeatletter \newcommand*\forcelen[1]{#1/\CF@atom@sep} \makeatother \begin{document} These bonds are exactly 5mm long: \chemfig{-[,\forcelen{5mm}]-[:60,\forcelen{5mm}]} \end{document} If both atoms are not empty, the argument of \forcelen is not the length of the bond. It is the distance between the ...

5

I've found a way. It was rather simple, but I've hoped that there is a special command for such thing, because there is one in chemdraw. Here is the code: \documentclass[12pt,a4paper]{article} \usepackage{graphicx} \usepackage{chemfig,tikz} \begin{document} \begin{figure}[h] \centering { \setatomsep{2em} ...

5

chemfig's \Lewis uses \printatom (a chemfig macro) internally. You have to redefine it: \documentclass{beamer} \usepackage[T1]{fontenc} \usepackage{chemfig} \usepackage{chemmacros} \chemsetup[chemformula]{font-shape=sf} \renewcommand*\printatom[1]{\ensuremath{\mathsf{#1}}} \begin{document} \begin{frame} \begin{reactions} Cl-Cl ...

4

Here is how to draw the 2 first arrows: \documentclass{article} \usepackage{chemfig} \begin{document} \chemfig{*6((-[@{a1}]H_2@{a2}\Lewis{26,N})=[@{r1}]-[@{r2}]=(-N=N-*6(=-=(-OH)-=-))-=-=)} \chemmove[-stealth,shorten <=1pt, shorten >=1pt]{% \draw(a2)..controls +(90:5mm) and +(135:5mm)..(a1);% first arrow \draw(r1)..controls +(225:12mm) and ...

4

In a bind, you can slap it on after the fact with a \stackinset. The syntax here means that the inset item (a bold +) is placed 10pt to the right of center, and 15pt above center on the underlying \chemfig. \documentclass{article} \usepackage{chemfig} \usepackage{stackengine} \begin{document} \stackinset{c}{10pt}{c}{15pt}{\textbf{+}}{% \chemfig{ ...

4

I defined TikZ decorations: \documentclass{article} \usepackage{chemfig} \usetikzlibrary{decorations} \makeatletter \newdimen\mystartshorten \newdimen\myendshorten \mystartshorten0pt \myendshorten0pt \pgfdeclaredecoration{sdbond}{initial}{ \state{initial}[width=\pgfdecoratedremainingdistance,next state=final] { { ...

4

»not very elegant« is not a very precise description of what's wrong... First of all I'd use a list for the, well, list, i.e., enumerate. The labels can easily be adjusted with enumitem. Then I'd make the arrows longer using the last optional argument of the \arrow command: \arrow[<angle>,<length factor>] I'd also shorten the bond length a ...

4

Here's a chemfig only way: use its \startscheme ... \stopscheme mechanism in combination with the invisible »arrow« 0 and the anchoring of TikZ nodes. The trick here: \arrow(@c1.south east--.north east){0}[-90,.1] an invisible arrow {0} pointing downwards (-90) and shortened (.1) that connects compound c1 with a new one, the former anchored south east ...

4

Here's a crazy idea: use a tabular. \documentclass{article} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage[ngerman]{babel} \usepackage{array,chemfig} \usepackage{lipsum}% dummy text \begin{document} \lipsum[1] \begin{figure}[htbp] \centering \begin{tabular}{c@{\qquad}c@{\qquad}c} \chemfig{ ...

3

Since you're already loading the chemmacros package which loads and uses the chemformula package you can use the latter for the reaction. The key is the !(<below>)(<text>) syntax inside of \ch. \documentclass[12pt,letterpaper]{report} \usepackage{chemmacros} % \usepackage{siunitx} % already loaded by `chemmacros' \begin{document} ...

3

If it should like (near) exactly as in the picture, the following modification may be useful. The angles are assummed to be 30 and 120 degrees; hence the correction: 120+72=192. Your original definition is left in the preamble for comparision. \documentclass{article} \usepackage{chemfig} \definesubmol{ring}{N*5(=-{NH}-(-)=-)} % imidazole ring ...

3

The trick is to use invisible bonds. The lenght of a 6-ring is 2 bonds: \documentclass{article} \usepackage{chemfig} \begin{document} \setatomsep{1.75em} \chemfig{C(-[4,2]**6(---(-[,3,,,draw=none])---))(=[6]O)-O?-[,4,,,draw=none]?*6(---N(-CH_3)---)}\vskip5ex ...

3

Here is what I would probably do: you already found out about the 0 arrow. It can be combined with the fact that everything between two arrows again is a node that can be referred to. chemfig names them consecutively c1, c2, ... (you can check the nodes and their names placing \schemedebug{true} befor the scheme starts). However, the \arrow macro allows to ...

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