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Single crystals of La[H 2 N 3 C 3 O 3 ] 3  · 8.5 H 2 O were obtained from stoichiometric amounts of as-precipitated La(OH) 3  with cyanuric acid (CYA) [H 3 N 3 C 3 O 3 ] 3  in a boiling aqueous solution, followed by slow cooling and evaporation of water under ambient conditions. According to the X-ray structure analysis of the colorless and transparent crystals, La[H 2 N 3 C 3 O 3 ] 3  · 8.5 H 2 O adopts the triclinic space group  P 1 (no. 1) and exhibits the unit-cell parameters  a  = 987.24(7),  b  = 1110.97(8),  c  = 1179.81(9) pm,  α  = 113.716(2),  β  = 97.053(2),  γ  = 101.502(2)° for  Z  = 2. The CYA is singly deprotonated to give monoanions [H 2 N 3 C 3 O 3 ] –  which are O,N-coordinated to the La 3+  cations. These dihdrogencyanurate anions are assembled in ribbons with two crystallographically different La 3+  cations coordinating to either one or two different ligands, respectively. The coordination sphere of the La 3+  cations is comprised of water molecules, and interstitial water molecules fill the dead volume of the crystals. The anionic ribbons are stacked to maximize the contact between the six-membered rings, showing distances of about 330 pm.

Synthesis and crystal structure of the lanthanum cyanurate complex La[H 2 N 3 C 3 O 3 ] 3 · 8.5 H 2 O