Unit PHOTOCHEMISTRY
- Course
- Chemical sciences
- Study-unit Code
- 55999066
- Curriculum
- In all curricula
- Teacher
- Anna Spalletti
- Teachers
-
- Anna Spalletti
- Hours
- 42 ore - Anna Spalletti
- CFU
- 6
- Course Regulation
- Coorte 2022
- Offered
- 2023/24
- Learning activities
- Affine/integrativa
- Area
- Attività formative affini o integrative
- Academic discipline
- CHIM/02
- Type of study-unit
- Opzionale (Optional)
- Type of learning activities
- Attività formativa monodisciplinare
- Language of instruction
- Italian
- Contents
- Basic principles of Photochemistry. Nature of the excited electronic states and photophysical/photochemical deactivation processes. Bimolecular processes of energy, electron and proton transfer. Stationary and pulsed photochemical techniques. Photochemical phenomena and technological applications of Photochemistry.
- Reference texts
- R. P. WAYNE, Photochemistry, Butterworths; I. BARALDI, La luminescenza. Elementi di fotofisica molecolare, 2007, Bononia University Press; supplemented by material provided by the teacher.
- Educational objectives
- The student will become familiar with the most important concepts and knowledge on the photochemistry and of the most widely used experimental techniques (classical and more advanced).
In particular, the following objectives will be pursued:
Knowledge of dissipation mechanisms of the electronic excitation energy that lead to interesting photochemical reactions and/or to mono- and bi-molecular photophysical relaxation processes.
Knowledge of the most important conventional and up to date techniques used to study such processes.
Knowledge of the most important technological and industrial applications of photochemistry.
Ability to address the issues for determining important parameters (such as quantum yield of a photoprocess or emission, lifetime of an excited electronic state, lamp attinometry, etc.) within a photochemical laboratory.
Critical ability to evaluate beneficial effects (in photochemical synthesis, photodynamic cancer therapy, solar energy storage, etc.) and harmful (photochemical degradation of photosensitive materials, DNA damages from UV radiation, etc.) in light- matter interaction.
Passionate students on the themes developed during the course also through the presentation of special studies and the results of the teacher. "You really learn only what you love" Goethe. - Prerequisites
- In order to be able to understand the topics covered in the course, students must have basic knowledge of Molecular Spectroscopy as regards the concepts of light-matter interaction, absorption and emission, transition probability , electronic states and of Chemical Kinetics as regards the concepts of reaction molecularity, rate constant, differential and integrated kinetic laws, competitive processes. Knowledge of these concepts is a prerequisite for the student who wants to follow the course of Photochemistry profitably. These concepts will be summarized at the beginning of the course.
- Teaching methods
- Lectures with slide shows. Some lessons will be dedicated to revision and deepening of the issues addressed, some others to carry out numerical applications.
- Other information
- Attendance is strongly recommended but not mandatory.
- Learning verification modality
- The exam consists of an oral test which is an interview of about 45 minutes long aiming to ascertain the knowledge level and the understanding capibility acquired by the student on theoretical and methodological contents as indicated on the program. The oral exam will also test the student communication skills and his autonomy in the organization and exposure of the threoretical topics.
- Extended program
- Historical notes. General notions on electromagnetic radiation (nature, sources, monochromators, detectors and chemical actinometries) and equipment commonly used in photochemical laboratories.
Nature of electronic excited states and photophysical deactivation processes. Kinetic parameters and quantum yields. Monomolecular (radiative and non radiative) and bimolecular (energy, charge and proton transfer, excimers and exciplexes) processes. Primary photochemical processes: dissociation, intramolecular rearrangement, dimerization, addition, extraction of hydrogen (intermolecular and intramolecular).
Determination of the mechanism of photochemical reactions and analysis of the factors that can influence the direction and yield; practical possibility to address the photoreaction. Photosensitizer reactions.
Pulsed techniques in photochemistry: the study of short-lived intermediates in various domains of time and measure lifetimes of excited states.
Overview, description and analysis of some industrial and technological applications of photochemistry: photochromic, synthesis, polymerization and fotoreticolazione, photosensitization and photodegradation, storage of solar energy, chemiluminescence and photocatalysis.