Single crystals of Sn(H₂O)₃[B₁₀H₁₀] · 3 H₂O and Sn(H₂O)₃[B₁₂H₁₂] · 4 H₂O are easily accessible by reactions of aqueous solutions of the acids (H₃O)₂[B₁₀H₁₀] and (H₃O)₂[B₁₂H₁₂] with an excess of tin metal powder after isothermal evaporation of the clear brines. Both compounds crystallize with similar structures in the triclinic system with space group P\(\bar{1 }\) and Z = 2. The crystallographic main features are electroneutral \({}_{\infty }^{1} \{\)Sn(H₂O)_3/1[B₁₀H₁₀]_3/3} and \({}_{\infty }^{1} \{\) Sn(H₂O)_3/1[B₁₂H₁₂]_3/3} double chains running along the a-axes. Each Sn²⁺ cation is coordinated by three water molecules of hydration (d(Sn–O) = 221–225 pm for the B₁₀ and d(Sn–O) = 222–227 pm for the B₁₂ compound) and additionally by hydridic hydrogen atoms of the three nearest boron clusters (d(Sn–H) = 281–322 pm for the B₁₀ and d(Sn–H) = 278–291 pm for the B₁₂ compound), which complete the coordination sphere. Between these tin(II)-bonded water and the three or four interstitial crystal water molecules, classical bridging hydrogen bonds are found, connecting the double chains to each other. Furthermore, there is also non-classical hydrogen bonding between the anionic [B_nH_n]²⁻ (n = 10 and 12) clusters and the crystal water molecules pursuant to B–H^δ−\(\cdots\)^δ+H–O interactions often called dihydrogen bonds.

Sn(H ₂ O) ₃ [B ₁₀ H ₁₀ ] · 3 H ₂ O 和 Sn(H ₂ O) ₃ [B ₁₂ H ₁₂ ] · 4 H ₂ O 的单晶很容易通过在等温蒸发澄清盐水后，将酸(H ₃ O) ₂ [B ₁₀ H ₁₀ ]和(H ₃ O) ₂ [B ₁₂ H ₁₂ ]与过量的锡金属粉末混合。两种化合物在空间群为P的三斜晶系​​中以相似的结构结晶\(\bar{1 }\)和Z  = 2。晶体学的主要特征是电中性\({}_{\infty }^{1} \{\) Sn(H ₂ O) _3/1 [B ₁₀ H ₁₀ ] _3/3 } 和\({}_{\infty }^{1} \{\) Sn(H ₂ O) _3/1 [B ₁₂ H ₁₂ ] _3/3 } 双链沿着a -轴。每个的Sn ²⁺阳离子由水合（的三个水分子配位d（SN-O）= 221-225时为B ₁₀和d（SN-O）= 222-227时为B₁₂化合物）和另外由三个最近硼簇的氢负离子的氢原子（d（SN-H）= 281-322时为B ₁₀和d（SN-H）= 278-291时为B ₁₂化合物），这完成了协调领域。在这些锡（II）键水和三个或四个间隙结晶水分子之间，发现了经典的桥连氢键，将双链相互连接。此外，阴离子 [B _n H _n ] ²⁻ (n = 10 和 12) 簇与结晶水分子之间也存在非经典氢键，依据 B–H ^δ− \(\cdots\) ^δ+H-O 相互作用通常称为二氢键。