Porphyrin - Wikipedia
The parent of porphyrins is porphine, a rare chemical compound of exclusively theoretical interest. Substituted porphines are called porphyrins. [1] With a total of 26 π-electrons, of which 18 π-electrons form a planar, continuous cycle, the porphyrin ring structure is …
Porphyrin - Definition, Types and Quiz | Biology Dictionary
2018年3月15日 · A porphyrin is a large ring molecule consisting of 4 pyrroles, which are smaller rings made from 4 carbons and 1 nitrogen. These pyrrole molecules are connected together through a series of single and double bonds which forms the molecule into a large ring.
卟啉 - 百度百科
卟啉是一类由四个 吡咯 类亚基的 α-碳原子 通过 次甲基 桥（=CH-）互联而形成的 大分子 杂环化合物，分子式为C84H90N8O12S4。 卟啉（读音：bǔ lín）porphyrin (s)是一类由四个吡咯类亚基的 α-碳原子 通过次甲基桥（=CH-）互联而形成的 大分子 杂环化合物。 其 母体化合物 为卟吩（porphin，C20H14N4），有 取代基 的卟吩即称为卟啉。 卟啉环有26个π电子，是一个高度共轭的体系，并因此显深色。 “卟啉”一词是对其英文名称porphyrin的音译，其英文名则源于希腊语 …
Porphyrin | C20H14N4 | CID 66868 - PubChem
Many porphyrins are naturally occurring pigments. Porphyrins with metal ions bound to the porphin ring can be cofactors for biological processes, such as oxygen transport by hemes and photosynthesis by chlorophyll.
Porphyrin Metabolism | Pathway - PubChem
2019年5月30日 · The porphyrin ring is the framework for the heme molecule, the pigment in hemoglobin and red blood cells. The first reaction in porphyrin ring biosynthesis takes place in the mitochondria and involves the condensation of glycine and succinyl-CoA by delta-aminolevulinic acid synthase (ALAS).
Porphyrin | Photosynthesis, Heme, Proteins | Britannica
Porphyrins have complex cyclic structures. All porphyrin compounds absorb light intensely at or close to 410 nanometres. Structurally, porphyrin consists of four pyrrole rings (five-membered closed structures containing one nitrogen and four carbon atoms) linked to each other by
Porphyrins and Metalloporphyrins : An Overview - ResearchGate
2020年6月1日 · Porphyrin-based photosensitisers with amphiphilic properties, bearing one or more positive charges, are an effective tool in PDT against cancers, microbial infections and, most recently ...
Porphyrin - an overview | ScienceDirect Topics
Porphyrins are a class of macrocyclic aromatic compounds composed of four pyrrole rings connected by methine bridges (Chart 3.5). Porphyrins are ubiquitous in nature, as a heme cofactor of hemoglobin, cytochromes, and other redox active enzymes, and, as more saturated analogs, in the photosynthetic apparatus in plants and bacteria.
Porphyrins : the Colors of Life – PhysicsOpenLab
2016年7月4日 · The parent porphyrin is porphin, and substituted porphines are called porphyrins. The porphyrin ring structure is aromatic, with a total of 26 electrons in the conjugated system.
β,β-Directly Linked Porphyrin Rings: Synthesis, Photophysical ...
2023年5月5日 · These two porphyrin oligomers feature a central aromatic benzene or nonaromatic cyclooctatetraene (COT) ring, respectively. Their structures have been unambiguously characterized by a combination of nuclear magnetic resonance (NMR) spectroscopy, mass spectrometry, and X-ray single-crystal diffraction analysis.