Erratum

In issue 180(11), the article ‘Hydrothermal Synthesis, Crystal Structures and Characterization of Two Hydrogen Phosphates Templated by 4-Amino-2,2,6,6,-tetramethylpiperidine’ by A. Dakhlaoui et al., the unit cell parameter b = 10.466 was incorrectly printed as c = 0.466 in both the abstract and Table V. Following are the corrected abstract and Table V.

Chemical preparations, crystal structures, thermal analyses, and IR spectroscopic studies are given for two new hydrogen phosphates templated by 4-amino-2,2,6,6-tetramethylpiperidine: (C ₉ H ₂₂ N ₂ ) ₂ ·(H ₂ PO ₄ )·(HPO ₄ )·(F)·H ₂ O ( I ) and (C ₉ H ₂₂ N ₂ )·(H ₂ PO ₄ ) ₂ ( II ). The structures are determined by single crystal X-ray diffraction. Both compounds crystallize in the P2 ₁ /c (N°14) monoclinic space group with the unit cell parameters: a = 14.856 (1) Å, b = 14.092 (2) Å, c = 14.7166 (9) Å, β = 118.434 (7)°, V = 2709.2 (4) Å ³ , and Z = 4 for (I) and a = 9.803 (2) Å, b = 10.466 (2) Å, c = 15.640 (8) Å, β = 94.990 (4), V = 1598.68 (7) Å ³ , and Z = 4 for ( II ).

TABLE V Crystal Data and Intensity Measurement for (C₉H₂₂N₂)₂·(H₂PO₄)·(HPO₄)·(F)·H₂O () and (C₉H₂₂N₂)·(H₂PO₄)₂()

	I	II
Formula	[C9H22N2]2·(H2PO4)·	[C9H22N2]·
	(HPO4)·(F)·H2O	(H2PO4)2
Molecular weight (g mol^−1)	546.56	352.26
Space group	P21/c (N°14)
Cell parameters
a (Å)	14.856 (1)	9.803 (2)
b (Å)	14.092 (2)	10.466 (2)
c (Å)	14.7166 (9)	15.640 (8)
β (°)	118.434 (7)	94.990 (4)
Volume (Å^3); Z	2709.2 (4); 4	1598.68 (7); 4
ρcalc., ρexp.(g cm^− 3)	1.34, 1.296 (3)	1.46, not
		measured
Diffractometer, T(K)	Siemens AED2,
	293 (2)
	MoKα 0.71073 Å ω−2θ
Radiation (graphite monochromated)
Scan mode
hkl min–max	0 ≤ h ≤ 20,	−10 ≤ h ≤ 10,
	−19 ≤ k ≤ 0,	0 ≤ k ≤ 11,
	−20 ≤ l ≤ 18	0 ≤ l ≤ 16
Absorption correction	Empirical	Empirical
2θ limit	60°	45°
Number of independent reflections	6009	1435
Number of refined parameters	325	144
Final R/Rw indices (I > 2σ (I))	0.043/0.149	0.060/0.149
Goodness of fit on F ^2	1.129	1.035

The structure of I , refined to R = 0.042 and R _w = 0.067 for 6009 reflections (I ≥ 2σ (I)), exhibits infinite inorganic chains _∞((H ₂ PO ₄ )·(HPO ₄ )·(F)·H ₂ O) ⁴⁻ linked together through weak hydrogen bonds to form layers onto which the diprotonated [C₉H₂₂N₂]^{2 +} amine molecules are anchored.

The structure of II , refined to R = 0.060 and R _w = 0.086 for 1435 reflections (I ≥ 2σ (I)), consists of _∞(H ₂ PO ₄ )⁻ (100) layers between which [C ₉ H ₂₂ N ₂ ] ²⁺ cations are inserted. A network of hydrogen bonds connects the different components. IR spectra of I and II show the characteristic bands of amine groups and phosphate anions.