I want to draw this formula using chemfig:

BCA Cu+ Complex

This is what I've got so far:


my try

I don't get the angle from N to Cu+ right. I tried to rotate parts of the formula, but there is always at least one angle that does not fit.

Any idea?


2 Answers 2


Yes, I have an idea:


enter image description here


The following code is similar to what unbonpetit wrote. The term .5 in [0,.5] and [180,.5] is chosen such that the aromatic cycles do not get too big.

(-[:+ 45]N([0,.5]**6(---(-COO^{-})-**6(------)--)))

enter image description here

  • @unbonpetit: I don't see the point...
    – strpeter
    Dec 31, 2013 at 16:28
  • It is not exactly the same since your inner ring has 6 bonds instead of 5. Moreover, your code is not more or less explicit than mine, even after several edits.
    – unbonpetit
    Dec 31, 2013 at 16:29
  • I must admit that the term "explicit" is misleading.
    – strpeter
    Dec 31, 2013 at 16:37

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