1999
DOI: 10.1002/chin.199919009
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ChemInform Abstract: The Polar [WO2F4]2‐ Anion in the Solid State.

Abstract: structure structure (solids and liquids) D 2000 -009The Polar [WO 2 F 4 ] 2− Anion in the Solid State.-The crystal structures of the compounds (IV) and (V) are solved by single-crystal X-ray analysis. Compound (IV) crystallizes in the tetragonal space group I4 1 22 with Z = 4. Its structure is built from [Cu(py) 4 (WO 2 F 4 ) 2 ] 2− anions hydrogen bonded to pyridinium (pyH + ) cations. Compound (V) is obtained in two polymorphic forms in an overall yield of 60%. Polymorph A crystallizes in the tetragonal spac… Show more

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Cited by 6 publications
(7 citation statements)
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“…After years of exploration, scientists found that utilization of functional units to construct target structures is an effect strategy to obtain new SHG crystals . The most common functional units include: (1) “one side” coordinated lone pair units, such as IO 3 triangular pyramid in α-LiIO 3 , (2) distorted polyhedral units containing d 0 transition metals, such as the NbO 6 octahedron in KNbO 3 , (3) π-conjugate planar units, such as the BO 3 triangle in β-BaB 2 O 4 , and (4) symcenter excluded tetrahedral units, such as PO 4 tetrahedron in KDP (KH 2 ­PO 4 ). Recent research shows that introducing two or more different functional units to one structure may enhance its SHG efficiency if their polarizations can be constructively added. , Many excellent SHG materials were reported based on this method, for example, Rb 3 VO­(O 2 ) 2 ­CO 3 (21 × KDP), BiSe­O 3 F (13.5 × KDP), Pb 2 ­BO 3 I (13.5 × KDP), and Pb 2 ­(BO 3 )­(NO 3 ) (9 × KDP)…”
Section: Introductionmentioning
confidence: 99%
“…After years of exploration, scientists found that utilization of functional units to construct target structures is an effect strategy to obtain new SHG crystals . The most common functional units include: (1) “one side” coordinated lone pair units, such as IO 3 triangular pyramid in α-LiIO 3 , (2) distorted polyhedral units containing d 0 transition metals, such as the NbO 6 octahedron in KNbO 3 , (3) π-conjugate planar units, such as the BO 3 triangle in β-BaB 2 O 4 , and (4) symcenter excluded tetrahedral units, such as PO 4 tetrahedron in KDP (KH 2 ­PO 4 ). Recent research shows that introducing two or more different functional units to one structure may enhance its SHG efficiency if their polarizations can be constructively added. , Many excellent SHG materials were reported based on this method, for example, Rb 3 VO­(O 2 ) 2 ­CO 3 (21 × KDP), BiSe­O 3 F (13.5 × KDP), Pb 2 ­BO 3 I (13.5 × KDP), and Pb 2 ­(BO 3 )­(NO 3 ) (9 × KDP)…”
Section: Introductionmentioning
confidence: 99%
“…The BBU approach involves crystallizing acentric units, such as metal oxide–fluoride complex anions (NbOF 5 2– , VOF 5 2– , MoO 2 F 4 2– , etc. ) into extended networks with the intention of forming NCS lattices. However, it has been widely observed that centrosymmetric structures in which the BBUs antialign, or adopt orientationally disordered arrangements, tend to be favored unless specific steps are taken to oppose this.…”
Section: Discussionmentioning
confidence: 99%
“…Construction of the homochiral center, adjustment of intermolecular interactions, and modification of molecular structure can realize the designed synthesis of polar molecule-based materials . Specific methods include the introduction of chiral ligands, the adjustment of the inorganic framework and the selection of template organic cations in perovskite, and the introduction of asymmetric elements (−Cl, −Br, −I, −OH, −CH 3 , O) based on cations, etc. ,, The beneficial effect of polar anions on the design of polar crystals is also feasible, such as the construction of polar crystals based on the polar anions [WO 2 F 4 ] 2– and [Cr 2 O 7 ] 2– . , In this context, we aim to construct polar inorganic–organic hybrid compounds through introducing a polar anion [GeCl 3 ] − of triangular pyramid structure with the help of lone pair electrons. [GeCl 3 ] − , as a polar basic building unit (BBU), has once been used to construct polar crystal CsGeCl 3 with a strong optical second harmonic generation (SHG) effect in inorganic materials .…”
Section: Introductionmentioning
confidence: 99%