5

I am trying to draw a molecule with two connecting pentagonal rings. This is what I have so far:

\begin{figure}
\chemfig{
    O=_[1,,]*5([::-45]-O-Cu*5([::-72]-NH_2--(=^[1,,]O)-O-)-NH_2--)
}
\caption{\textit{trans}-bisglycinatocopper(II)}
\label{fig:trans-bisglycinatocopper(II)}
\end{figure}

Which gives me:

molecule with distorted ring

I try to fix it by adding [,,1] to the bond after NH2:

\begin{figure}
\chemfig{
    O=_[1,,]*5([::-45]-O-Cu*5([::-72]-NH_2-[,,1]-(=^[1,,]O)-O-)-NH_2--)
}
\caption{\textit{trans}-bisglycinatocopper(II)}
\label{fig:trans-bisglycinatocopper(II)}
\end{figure}

Which gives me:

molecule with overlapping bond

I understand that in the notation [,,1], 1 is the atom of departure for the bond.

How do I get the ring to be a regular pentagon, while also preventing the bond from overlapping the formula?

6

I figured it out, the options for the bond has a fourth option. I needed to add [,,,2] to the bond preceding NH2 to indicate that it should connect to the second atom:

\begin{figure}
\chemfig{
    O=_[1,,]*5([::-45]-O-Cu*5([::-72]-[,,,2]H_2N-[,,2]-(=^[1,,]O)-O-)-NH_2--)
}
\caption{\textit{trans}-bisglycinatocopper(II)}
\label{fig:trans-bisglycinatocopper(II)}
\end{figure}

fixed ring with no distortion

Take a look at the "Departure and Arrival Atoms" section of this documentation.

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