The structure of a molecular square assembling from [Pd(en)(NO3)2] 3 and 4,4′-bipyridine is confirmed by X-ray crystallography, whereas squares assembling from 3 and larger ligands, py-X = py (py = 4-pyridyl, X = CH![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
CH, C![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
C, P-C6H4) are shown to exist in equilibrium with molecular triangles.
M. Fujita, O. Sasaki, T. Mitsuhashi, T. Fujita, J. Yazaki, K. Yamaguchi and K. Ogura, Chem. Commun., 1996, 1535 DOI: 10.1039/CC9960001535
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