A family of multinuclear rare-earth (RE)-implanted H(2)tart(2-)-functionalized selenotungstates (STs) [H2N(CH3)(2)](13)H{[W2O5 (OH)(2)-(H(2)tart)(2)](H(2)tart){[W3O6RE2(H2O)(6)][SeW9O33](2)}(2)}center dot 31H(2)O [RE = Eu3+ (1), Tb3+ (2), Dy3+ (3), Ho3+ (4), Y3+ (5); ( )H(4)tart = D-tartaric acid] have been afforded by a simple one-pot aqueous reaction and were structurally characterized. Intriguingly, their isomorphous organic-inorganic hybrid anion {[W2O5(OH)(2)(H(2)tart)(2) ](H(2)tart){[W3O6RE2 (H2O)(6)]-[SeW9O33](2)}(2)}(14-) includes two sandwich-type {[W3O6[RE2(H2O)(6)]-[SeW9O33](2)}(4-) dimeric units with a W-O-RE heterometal core, which are further joined by two H(2)tart(2-)decorated dinuclear tungsten-oxo {W2O5(OH)(2) (H(2)tart)(2)} clusters and a bridging H(2)tart(2-) ligand, contributing to a surprising Mobius band-like configuration. It is worth emphasizing that three H(2)tart(2-) ligands coordinate with tungsten centers rather than RE cations. For all we know, 1-5 delegate the infrequent RE-implanted STs functionalized by triplicate H(2)tart(2-) bridges. Furthermore, fluorescent performances of 1-4 as well as magnetic properties of 2-4 have been surveyed. The solid-state fluorescence emission spectra prove that each of them undoubtedly shows the characteristic emission peaks of RE cores, while alternating-current susceptibility measurements suggest field-induced single-molecule magnetic behavior in 3.