Haems and Chlorophylls

Haems and chlorophylls: comparison of function and formation.

In 1844 Verdeill reported that acid treatment of chlorophyll or haem yielded apparently similar red compounds; he even postulated that chlorophylls would contain iron. Hoppe-Seyler2 confirmed the apparent similarity of acid derivatives of haems and chlorophylls from their light absorption characteristics, a point rather overshadowing the discovery at the same time by McMunn3 of cytochromes, ano...

Chlorophylls, Symmetry, Chirality, and Photosynthesis

Chlorophylls are a fundamental class of tetrapyrroles and function as the central reaction center, accessory and photoprotective pigments in photosynthesis. Their unique individual photochemical properties are a consequence of the tetrapyrrole macrocycle, the structural chemistry and coordination behavior of the phytochlorin system, and specific substituent pattern. They achieve their full pote...

Chlorophylls - Natural Solar Cells

A molecular modeling study was conducted on a series of six natural occurring chlorophylls. Quantum chemistry calculated orbital energies were used to estimate frequency of transitions between occupied molecular orbital and unoccupied molecular orbital energy levels of chlorophyll molecules in vivo conditions in standard (ASTMG173) environmental conditions. Obtained results are in good agreemen...

Section 1: Chemistry of Chlorophylls 3 1.1 STRUCTURE AND OCCURRENCE OF CHLOROPHYLLS

Chlorophylls and Carotenoids: Measurement and Characterization by UV-VIS Spectroscopy

The quantitative determination of chlorophyll (Chl) a, Chl b, and carotenoids in a wholepigment extract of green plant tissue by UVVIS spectroscopy is complicated by the choice of sample, solvent system, and spectrophotometer used. The various plant pigments absorb light in overlapping spectral regions, depending on the system selected. This unit discusses methods used to account for such overl...