Donakowski Martin D, Gautier Romain, Lu Hongcheng, Tran T Thao, Cantwell Jacqueline R, Halasyamani P Shiv, Poeppelmeier Kenneth R
Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States.
Inorg Chem. 2015 Feb 2;54(3):765-72. doi: 10.1021/ic501486x. Epub 2014 Aug 19.
The syntheses of two noncentrosymmetric (NCS) vanadium oxide-fluoride compounds that originate from the same synthetic reagent concentrations are presented. Hydrothermal and low-temperature syntheses allow the isolation of metastable products that may form new phases (or decompose) upon heating and allow creation of chemically similar but structurally different materials. NCS materials synthesis has been a long-standing goal in inorganic chemistry: in this article, we compare two chemically similar NCS inorganic materials, NaVOF(4)(H(2)O) (I) and NaVO(2-x)F(2+x) (II; x = 1/3). These materials originate from the same, identical reagent mixtures but are synthesized at different temperatures: 100 °C and 150 °C, respectively. Compound I crystallizes in Pna2(1): a = 9.9595(4) Å, b = 9.4423(3) Å, and c = 4.8186(2) Å. Compound II crystallizes in P2(1): a = 6.3742(3) Å, b = 3.5963(2) Å, c = 14.3641(7) Å, and β = 110.787(3)°. Both materials display second-harmonic-generation activity; however, compound I is type 1 non-phase-matchable, whereas compound II is type 1 phase-matchable.
本文介绍了两种由相同合成试剂浓度制备的非中心对称(NCS)钒氧化物氟化物化合物的合成。水热合成和低温合成能够分离出亚稳产物,这些产物在加热时可能会形成新相(或分解),并能制备出化学性质相似但结构不同的材料。NCS材料的合成一直是无机化学领域长期追求的目标:在本文中,我们比较了两种化学性质相似的NCS无机材料,NaVOF₄(H₂O)(I)和NaVO₂₋ₓF₂₊ₓ(II;x = 1/3)。这些材料源自相同的试剂混合物,但合成温度不同,分别为100℃和150℃。化合物I以Pna2₁空间群结晶:a = 9.9595(4) Å,b = 9.4423(3) Å,c = 4.8186(2) Å。化合物II以P2₁空间群结晶:a = 6.3742(3) Å,b = 3.5963(2) Å,c = 14.3641(7) Å,β = 110.787(3)°。两种材料均表现出二次谐波产生活性;然而,化合物I是1型非相位匹配的,而化合物II是1型相位匹配的。