Extended Data Fig. 1: The crystal structure of (RPO(OH)2)2CuCl4 viewed along the c-axis highlighting the hydrogen bond network in the organic bilayer. | Nature

Extended Data Fig. 1: The crystal structure of (RPO(OH)2)2CuCl4 viewed along the c-axis highlighting the hydrogen bond network in the organic bilayer.

From: Directed assembly of layered perovskite heterostructures as single crystals

Extended Data Fig. 1

Carbon bonded hydrogens are not shown for clarity. Each phosphonic acid donates two hydrogen bonds and accepts two hydrogen bonds at the unprotonated oxygen atom. Each phosphonic acid hydrogen bonds only to phosphonic acid groups on the opposing face of the organic bilayer to form the checkerboard pattern illustrated. The elements P, C, H, N and O are coloured pink, grey, white, blue and red, respectively.

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