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Updated: Oct 13, 2026

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
Published on: August 19, 2013
Cation-Regulated [CH3BO2F]-Derived Borates: Synergistic Fluorination and Organic Functionalization for
Haoran Wang1,2, Haotian Qiu1,2, Chenxu Li1,2
1Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Functional Crystal Materials, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi, China.
Abstract:
Large birefringence is a key parameter for nonlinear optical (NLO) and birefringent crystals, as it is critical for extending the phase-matching wavelength of NLO crystals and optimizing the light-splitting performance of birefringent crystals. By rational structural design, two unprecedented functional building blocks (FBBs), [C4H5BO4F] and [C5H7BO4F], were successfully constructed from the newly identified [CH3BO2F] fragment via synergistic fluorination and organic functionalization. A cation-mediated structural engineering approach was employed to achieve four centrosymmetric (CS) compounds (α-KC4H5BO4F, β-KC4H5BO4F, KC5H7BO4F and Na0.5Cs0.5C4H5BO4F) and one noncentrosymmetric (NCS) structure (NaC4H5BO4F). Systematic investigations reveal the unique structure-directing role of Na+, yielding NaC4H5BO4F with a large birefringence (Δn = 0.139 at 1064 nm), strong SHG response (∼1.4 ×KDP) and a short phase-matching wavelength of 208 nm. Additionally, the four CS compounds also exhibit considerable birefringence values of 0.138, 0.121, 0.074 and 0.140 at 1064 nm, respectively. These findings validate the synergistic modification of borate units and cation regulation as a feasible and effective design strategy, providing valuable guidance for the targeted development of high-performance UV NLO materials with large birefringence and shortened phase-matching cutoff wavelengths.
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