Inside Back Cover: Exceptional Second Harmonic Generation in Ultraviolet Nonlinear Optical Oxyfluoroniobate Crystals via Structural Fingerprint Optimization of Polar Chains (Angew. Chem. Int. Ed. 36/2025)

In their Research Article (e202512618), Congcong Jin, Yang Li, Bingbing Zhang, Joon Ik Jang, Kang Min Ok, and co-workers present a structural fingerprint optimization strategy for ¹[TMOF₄]_∞ chain-based compounds, tuning chain geometry to maximize optical nonlinearity. In the UV NLO crystal (H₃O)(Biu)₂(NbOF₄), ideal structural fingerprints yield a record SHG response (10.8 × KH₂PO₄) among all known transition metal oxyfluorides.

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