In Teil II *Operation of ChemFig* Abschnitt 9 *Connecting Distant Atoms* ist die Syntax des `?`-Hooks beschrieben: > Fortunately the character `?` has an > optional argument: > > ?[<name>,<bond>,<tikz>] `?[<name>,<bond>,<tikz>]` > > where each field takes its default > value if it is empty: > > - The `<name>` is the name of the hook: all alphanumeric characters > (a…z, A…Z, 0…9) are allowed. The name > is `a` by default. In the first > occurrence of the hook with this name, > only this field is used. > - `<bond>` specifies how the atom with the current occurrence of the > named hook is to be bonded to the atom > with the first occurrence of the hook. > There are two ways this can be done. > First, this field can be an integer > representing the desired bond type: > 1=single bond, 2=double bond, etc. > (See the table on page 5 for the bond > codes.) Second, the field can be one > of the bond character codes, provided > that this character is between braces. > - `<tikz>` will be passed directly to TikZ as we have seen with regular > bonds. Also einfach der `<tikz>`-Option die gewünschte Farbe überreichen: \chemfig{ ? -[:195,,,,red] -[:50,,,,red] -[:80,,,,red] -[:20,,,,red] -[:-130,,,,red] ?[,,blue,ultra thick]( -[:10,,,,red] -[:-10,,,,red] -[:40,,,,red] -[:-170,,,,red] -[:-195,1.2,,,red] ) } ![alt text][1] [1]: http://texwelt.de/wissen/upfiles/chemfig-hook.png

In Teil II *Operation of ChemFig* Abschnitt 9 *Connecting Distant Atoms* ist die Syntax des `?`-Hooks beschrieben: > Fortunately the character `?` has an > optional argument: > > ?[<name>,<bond>,<tikz>] > > where each field takes its default > value if it is empty: > > - The `<name>` is the name of the hook: all alphanumeric characters > (a…z, A…Z, 0…9) are allowed. The name > is `a` by default. In the first > occurrence of the hook with this name, > only this field is used. > - `<bond>` specifies how the atom with the current occurrence of the > named hook is to be bonded to the atom > with the first occurrence of the hook. > There are two ways this can be done. > First, this field can be an integer > representing the desired bond type: > 1=single bond, 2=double bond, etc. > (See the table on page 5 for the bond > codes.) Second, the field can be one > of the bond character codes, provided > that this character is between braces. > - `<tikz>` will be passed directly to TikZ as we have seen with regular > bonds. Also einfach der `<tikz>`-Option die gewünschte Farbe überreichen: \chemfig{ ? -[:195,,,,red] -[:50,,,,red] -[:80,,,,red] -[:20,,,,red] -[:-130,,,,red] ?[,,blue,ultra thick]( -[:10,,,,red] -[:-10,,,,red] -[:40,,,,red] -[:-170,,,,red] -[:-195,1.2,,,red] ) } ![alt text][1] [1]: http://texwelt.de/wissen/upfiles/chemfig-hook.png