We successfully synthesized a verdazyl-based complex, $(p\text{−}\mathrm{Py}\text{−}\mathrm{V}\text{−}2,6\text{−}{\mathrm{F}}_2)\left[\mathrm{Cu}{\left(\mathrm{hfac}\right)}_2\right]$, which forms a spin-$\frac{1}{2}$ extended diamond chain comprising verdazyl radicals and ${\mathrm{Cu}}^{2+}$ ions. The magnetic susceptibility measurements indicate a dominant antiferromagnetic contribution and a singlet ground state. The magnetization curve exhibits a zero-field gap and a $\frac{1}{2}$ plateau. We reproduced these behaviors through numerical analysis based on the extended diamond chain. Furthermore, a perturbative analysis in the high-field region beyond the plateau maps the system onto an effective spin-$\frac{1}{2}$ XY-like chain, thereby demonstrating that the $\frac{1}{2}$ plateau originates from singlet dimer formation in the effective chain. These findings offer a perspective on quantum phases in one-dimensional spin systems and are expected to stimulate further investigations of spin chains with diamond units.

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• High magnetic fields
• Magnetic interactions
• Structural properties
• 1-dimensional spin chains
• Antiferromagnets
• Complex materials
• Magnetization measurements
• Susceptibility measurements