Potassium bis(2-methyllactato)borate hemihydrate (KMB) was grown by a solvent evaporation technique. Crystal structural analysis revealed that the potassium cation was pseudo-octahedrally coordinated by five O atoms from four bis(2-methyllactato)borate (MB) ligands and half-occupied water. The sharp peaks in the powder x-ray diffraction (PXRD) pattern confirmed the perfect crystalline nature of the KMB. Transparency was observed in the range from 215 nm to 1100 nm, and the bandgap of KMB was determined to be 2.15 eV. The molecular structure of KMB was established by interpreting the functional group vibrations through vibrational spectroscopy. The molecular structure was further confirmed by the nuclear magnetic resonance (NMR) spectral technique. The peak followed by valley nature observed is due to the self-focusing behavior of KMB. The minimum transmission near the focus in the open aperture curve is attributed to the reverse saturation absorption nature of KMB. The third-order susceptibility (χ⁽³⁾) of KMB is estimated to be 4.17694 × 10⁻⁵ esu. These results suggest that KMB can be used in optical sensors as well as other photonic and optoelectronic applications.

通过溶剂蒸发技术生长双（2-甲基内酯）硼酸钾半水合物（KMB）。晶体结构分析表明，钾阳离子是伪八面体配位的，来自四个双（2-甲基内酯）硼酸酯（MB）配体和半个水的五个O原子。粉末X射线衍射（PXRD）模式中的尖峰证实了KMB的完美结晶性。在215nm至1100nm的范围内观察到透明性，并且确定KMB的带隙为2.15eV。KMB的分子结构是通过振动光谱解释官能团振动而建立的。通过核磁共振（NMR）光谱技术进一步证实了分子结构。观察到的山峰是山谷自然所致，是由于九巴的自聚焦行为所致。开孔曲线中焦点附近的最小透射率归因于KMB的反向饱和吸收特性。三阶磁化率（九巴的χ ^（3））估计为4.17694×10 ^-5  esu。这些结果表明，KMB可用于光学传感器以及其他光子和光电应用。