This study presents the experimental realization of a spin-1/2 zigzag-square lattice in a verdazyl-based complex, namely ($m\text{−}\mathrm{Py}\text{−}\mathrm{V}\text{−}2,6\text{−}{\mathrm{F}}_2)\left[\mathrm{Cu}{\left(\mathrm{hfac}\right)}_2\right]$. Molecular orbital calculations suggest the presence of five types of frustrated exchange couplings. Our observations reveal an incremental increase in the magnetization curve beyond a critical field, signifying a phase transition from the antiferromagnetic ordered state to a quantum state characterized by a 1/2 plateau. This intriguing behavior arises from the effective stabilization of a zigzag chain by the external fields. These results provide evidence for field-induced dimensional reduction in a zigzag-square lattice attributed to the effects of frustration.

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• Frustrated magnetism
• Magnetic phase transitions
• Magnetism
• 1-dimensional systems
• 2-dimensional systems
• Antiferromagnets