Spectroscopic and Nonlinear Optical Insights of Picolinaldehyde‐Based Materials: Experimental and DFT Approach. - Aiman, Ume; Adeel, Muhammad; Jamal, Sadia; Hashmi, Syeda Maria; Gul, Wali; Rehman, Muhammad Atta Ur; Munawar, Khurram Shahzad; Ahamad, Tansir; Haroon, Muhammad (ChemistrySelect, 2025)