Propyl para-hydroxybenzoate (PHB) known as Propylparaben is an organic family that single crystal is grown by solvent evaporation process with a solvent like methanol. The value of unit cell geometry and the crystalline system with space group nature are estimated from the single-crystal XRD study. From the optical spectra, the lower absorption wavelength edge is measured using the visible optical spectrum of range 200–1200 nm. From the absorption edge value, different optical parameters such as band gap, extinction coefficient with absorption, optical and electrical conductivity, Urbach energy, and susceptibility values are measured. Also, the grown PHB crystals’ different dispersion parameters and strength of oscillator are also evaluated by using Wemple Di-Domenico single oscillator method. Third-order nonlinear parameters such as refractive index, nonlinear absorption coefficient, and nonlinear susceptibility are evaluated as 5.99 × 10⁻⁹cm²/W, 3.41 × 10⁻⁴ cm/W, and 5.76 × 10⁻⁶ esu by using the z-scan method. The microhardness analysis and different mechanical properties such as elastic stiffness constant, yield strength, fracture toughness, and Brittleness index are also estimated. The basic important solid-state properties such as the energy of plasma, Penn, and Fermi gap and the value of molecular electronic polarizability are measured and compared from various methods as the coupled dipole method, Clausius–Mossotti relation, and Lorentz equation. The intermolecular interaction of the PHB molecule is confirmed by the Hirshfeld surface study, and their percentage is evaluated by using a fingerprint plot.

丙基对位-羟基苯甲酸酯 (PHB) 被称为对羟基苯甲酸丙酯，是一种有机家族，通过溶剂蒸发过程与甲醇等溶剂生长单晶。从单晶 XRD 研究估计晶胞几何形状和具有空间群性质的结晶系统的值。从光谱中，使用 200-1200 nm 范围内的可见光谱测量较低的吸收波长边缘。根据吸收边值，可以测量不同的光学参数，例如带隙、吸收消光系数、光导率和电导率、Urbach 能量和磁化率值。此外，还使用 ​​Wemple Di-Domenico 单振子法评估了生长的 PHB 晶体的不同色散参数和振子强度。三阶非线性参数，如折射率、^-9 cm ² /W、3.41 × 10 ^-4  cm/W 和 5.76 × 10 ^-6 esu 通过使用 z 扫描方法。还估算了显微硬度分析和不同的机械性能，如弹性刚度常数、屈服强度、断裂韧性和脆性指数。通过耦合偶极子方法、克劳修斯-莫索蒂关系和洛伦兹方程等各种方法，测量和比较了基本重要的固态特性，例如等离子体的能量、佩恩和费米能隙以及分子电子极化率的值。Hirshfeld 表面研究证实了 PHB 分子的分子间相互作用，并使用指纹图评估了它们的百分比。