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The spin-1/2 Heisenberg antiferromagnet on an anisotropic triangular lattice(ATL) is an archetypal spin system hosting exotic quantum magnetism anddimensional crossover. However, the progress in experimental research on thisfield has been limited due to the scarcity of ideal model materials. Here, weshow that rhenium oxyhalides $A_{3}$ReO$_{5}X_{2}$, where spin-1/2 Re$^{6+}$ions form a layered structure of ATLs, allow for flexible chemical substitutionin both cation $A^{2+}$ ($A$ = Ca, Sr, Ba, Pb) and anion $X^{-}$ ($X$ = Cl, Br)sites, leading to seven synthesizable compounds. By combining magneticsusceptibility and high-field magnetization measurements with theoreticalcalculations using the orthogonalized finite-temperature Lanczos method, wefind that the anisotropy $J'/J$ ranges from 0.25 to 0.45 depending on thechemical composition. Our findings demonstrate that $A_{3}$ReO$_{5}X_{2}$ is anexcellent platform for realizing diverse effective spin Hamiltonians thatdiffer in the strength of the anisotropy $J'/J$ as well as the relevance ofperturbation terms such as the Dzyaloshinskii-Moriya interaction and interlayerexchange coupling.

Rhenium oxyhalides: a showcase for anisotropic-triangular-lattice quantum antiferromagnets