Directed Synthesis of Noncentrosymmetric Molybdates

Abstract

The directed synthesis of two noncentrosymmetric sulfated molybdates has been achieved through the use of chiral organic amines. Reaction gels containing either (R)-2-methylpiperazine or (S)-2-methylpiperazine, MoO 3 , H 2 SO 4 , and H 2 O were subjected to mild hydrothermal conditions, resulting in the growth of single crystals of [(R)-C 5 H 14 N 2 ][(MoO 3 ) 3 (SO 4 )]‚H 2 O and [(S)-C 5 H 14 N 2 ][(MoO 3 ) 3 (SO 4 )]‚H 2 O. These materials crystallize in the noncentroysmmetric space group P2 1 2 1 2 1 (No. 19), which exhibits the enantiomorphic crystal class 222 (D 2 ). The second harmonic generation activities were measured on sieved powders.

Crystal structure and spectroscopic study of bis-tetrapropylammonium hexachlorodicuprate(II), [N(C3H7)4]2Cu2Cl6

“…Single crystal X-ray diffraction data of the title compound were collected at room temperature on a Nonius Kappa-CCD diffractometer using Mo-Kα radiation (λ = 0.71073 Å) through the program COLLECT [19]. Correction for Lorentz-polarisation effect, peak integration and background determination were carried out with the program DENZO [20].…”

Noncentrosymmetric Inorganic Oxide Materials: Synthetic Strategies and Characterisation Techniques

“…[51][52][53] As stated previously, the first challenge in synthesising NCS materials is to use inherently asymmetric NCS polyhedra. In using the SOJT-distorted Mo 6þ , Norquist et al synthesised materials where the d 0 cation is substantially displaced from the centre of its oxide octahedra.…”

“…The lone-pair cation coordination environment may be considered as pre-distorted, [38] as these cations are almost always found in local NCS environments. Halasyamani et al, [38][39][40][41][42][43][44][45][46][47][48][49][50] Norquist et al, [51][52][53] and others [54][55][56][57][58][59][60][61][62][63] have used SOJT-distorted cations in the design and synthesis of new NCS materials.…”

“…The second challenge, ensuring that the octahedra are not related by inversion centres, was successfully addressed by using single enantiomer templating agents. An example of this strategy involves the synthesis of [(S)-C 5 [52] These materials were synthesised as pure…”

Synthesis, Crystal Structure and Characterization of [(CH3 CH2)4N] Mn1,5 Cl3 4H2O Cl 2(H2O)

“…Single-crystal X-ray data of [(CH3 CH2)4N] Mn1,5 Cl3 4H2O Cl 2(H2O) were collected at room temperature on a Nonius Kappa-CCD diffractometer using Mo-Kα radiation (λ = 0.71073 Å) through the program COLLECT [17]. Correction for Lorentz-polarisation effect, peak integration and background determination were carried out with the program DENZO [18].…”