Synthesis and Crystal Structure of the Iron(III) Oxotellurate(IV) Phosphate Oxide Chloride Fe₁₁(TeO₃)₂(TeO₄)₃(PO₄)₂O₄Cl₃

Abstract

The new compound Fe11(TeO3)2(TeO4)3(PO4)2O4Cl3 containing FeIII and TeIV crystallizes in the monoclinic space group C2/c with the unit cell parameters a = 20.5816(5) Å, b = 26.7506(6) Å, c = 5.03910(10) Å, β = 93.587(2)o, Z = 4. Single crystals were grown in sealed and evacuated silica tubes at 550 °C. The compound exhibits an open framework structure built from [FeO6], [FeO5Cl], [FeO4Cl], [PO4], [TeO3], and [TeO4] polyhedra. The TeIV atoms adopt a one sided asymmetric coordination due to the stereochemically active lone‐pair. The lone‐pairs together with the chloride ions are excluded from the covalently bonded space and protrude into cavities extending along [001]. Bond valence sum calculations confirm iron to be in its FeIII state and the chloride ions to be underbonded and act more as counterions than being fully integrated in the covalent network.

Cd3(PO4)(TePO6): A Novel Cadmium Tellurite‐Phosphate featuring a {[TePO6]3−}∞ Chain

“…[43] TeO 3 unit is only discovered in Na 3 Ca 4 (TeO 3 )(PO 4 ) 3 and Fe 11 (TeO 3 ) 2 (TeO 4 ) 3 (PO 4 ) 2 O 4 Cl 3 . [36,37] Besides, TeO x units can be also polymerized to multiple nuclear clusters, as evidenced by the case of Te The whole structure of Cd 3 (PO 4 )(TePO 6 ) is three-dimensional (3D) (Figure 1b). For the three types of structural units CdO 6 , TeO 4 , and PO 4 , CdÀ O bonds have the largest polarity and ionicity according to the electronegativity difference between these atoms.…”

“…Only Te 2 O(PO 4 ) 2 , K 2 (TeO)P 2 O 7 and Rb 2 (TeO)P 2 O 7 are NLO-active. [30,31] Other known tellurite-phosphates include Cs 2 (TeO)P 2 O 7 , [31] K 2 TeMo 2 O 6 (PO 4 ) 2 , [32] Ba 2 TeO(PO 4 ) 2 , [33] Ba 2 Cu 2 Te 2 P 2 O 13 , [34] Sr 2 Zn 3 Te 2 P 2 O 14 , [35] Na 3 Ca 4 (TeO 3 )(PO 4 ) 3 , [36] Fe 11 (TeO 3 ) 2 (TeO 4 ) 3 (PO 4 ) 2 O 4 Cl 3 , [37] Te 3 O 3 (PO 4 ) 2 , [38,39] Te 2 O 3 • HPO 4 , [40] Te 8 O 10 (PO 4 ) 4 , [41] BaTeMO 4 (PO 4 ) (M = Nb or Ta), [42] NaTePO 5 , SrTeP 2 O 8 , and Ba 2 TeP 2 O 9 . [43] By analyzing these compounds' compositions, it can be discovered that they either contain strong-ionic alkali/alkali-earth metal cations or don't contain any metal cations.…”