We present the realization of a spin-$\frac{1}{2}$ hexagonal-plaquette chain with Ising anisotropy, an unexplored quantum spin model that serves as a platform for investigating anisotropic quantum magnetism. Specific heat at zero field reveals a sharp peak at $T_{\mathrm{N}}=1.0$ K, indicating a phase transition to a $\mathrm{N}\acute{\mathrm{e}}\mathrm{el}$ order stabilized by interchain couplings. A perturbative analysis maps the system onto an effective spin-$\frac{1}{2}$ Ising-like chain, supporting the presence of an anisotropy-induced excitation gap. Furthermore, the interchain interactions may induce discrete excitations in the spinon continuum, reminiscent of Zeeman ladder physics observed in related one-dimensional Ising-like systems. These results establish a well-defined model system for correlated spin phenomena in anisotropic magnets and highlight a route for engineering Ising-like quantum states in molecular-based frameworks.

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• Magnetic interactions
• Spin-orbit coupling
• Spinon
• 1-dimensional spin chains
• 1-dimensional systems
• Antiferromagnets