Fig. 2: 1H NMR spectra of the self-assembly of the Rh414 square.
From: Pathway selection in the self-assembly of Rh4L4 coordination squares under kinetic control
1H NMR spectra (500 MHz, CDCl3, 298 K, aromatic region) of the self-assembly of the Rh4L4 squares under various conditions ([12–] = [Rh2+] = 1 mM). a Self-assembly from [Rh(CH3CN)4](BF4)2 and 12– in CDCl3 at 298 K, giving the Rh313 triangle and the Rh414 square in 23% and 39% yields, respectively. Asterisks indicate the carbon satellite of CHCl3. b Addition of n-Bu4N·dcb in a mixture of the Rh313 triangle and the Rh414 square obtained from the self-assembly of [Rh(CH3CN)4](BF4)2 and 12– in CDCl3 after convergence. The Rh313 triangle was converted into the Rh414 square at 298 K assisted by dcb–, although heating at 100 °C for 2 days is necessary without dcb– (Supplementary Fig. 14). c Self-assembly of the Rh414 square from Rh(dcb)2 and 12– in CDCl3 at 298 K to produce the Rh414 square in a 65% yield without formation of the Rh313 triangle during self-assembly. The yields were determined based on the internal standard.
