Internal-molecular

Referring to processes, forces, or properties occurring within the molecule itself, involving the interactions and arrangements of its constituent atoms, chemical bonds, and energy levels. This encompasses a wide range of phenomena including bond vibrations, electronic transitions, the shape and structure of the molecule, and how it is affected by internal forces. These properties are central to understanding a substance's reactivity, physical state, and spectroscopic behavior, setting it apart from the intermolecular forces that act between separate molecules. Understanding these internal factors allows predicting and explaining the properties of a substance. Internal molecular aspects describe the fundamental properties that define a molecule's behaviour.

Internal-molecular meaning with examples

• The specific vibrational modes of a molecule, investigated through infrared spectroscopy, are crucial for understanding Internal-molecular behavior. These modes, characterized by the internal motions of atoms bonded together, provide vital clues regarding the structure of a molecule, its stability, and its ability to react with other compounds. The position and intensity of the IR absorptions directly relate to these specific vibrational properties within the molecule.
• Examining a molecule's internal molecular properties is essential for predicting how a drug will interact with a protein receptor in the body. The spatial arrangement of its atoms, bond angles, and the polarity of its functional groups are internal attributes that influence how well the drug 'fits' into the receptor, and thus, how effectively it can alter the body’s biological processes, determining its therapeutic value.
• During a chemical reaction, an understanding of Internal-molecular mechanisms is crucial for comprehending the bond breaking and bond formation processes. The energy changes that accompany the movement of electrons within the molecule, the activation energy needed to begin a reaction, and the stability of intermediate products are all internal properties. These allow chemists to design more efficient and selective reaction pathways.
• The process of photoisomerization, in which a molecule changes its shape after absorbing light, is entirely controlled by internal molecular properties. The absorption of a photon can cause the molecule to rearrange its internal bonds and electron configuration, altering its shape and, consequently, changing its properties. These structural changes are the result of internal molecular energy redistribution.