Chlorophyll a

Chlorophyll a
Structure of chlorophyll a
Names
IUPAC name
Chlorophyll a
Systematic IUPAC name
Magnesium [methyl (3S,4S,21R)-14-ethyl-4,8,13,18-tetramethyl-20-oxo-3-(3-oxo-3-{[(2E,7R,11R)-3,7,11,15-tetramethyl-2-hexadecen-1-yl]oxy}propyl)-9-vinyl-21-phorbinecarboxylatato(2−)-κ2N,N′]
Other names
α-Chlorophyll
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.006.852 Edit this at Wikidata
EC Number
  • 207-536-6
RTECS number
  • FW6420000
UNII
  • InChI=1S/C55H73N4O5.Mg/c1-13-39-35(8)42-28-44-37(10)41(24-25-48(60)64-27-26-34(7)23-17-22-33(6)21-16-20-32(5)19-15-18-31(3)4)52(58-44)50-51(55(62)63-12)54(61)49-38(11)45(59-53(49)50)30-47-40(14-2)36(9)43(57-47)29-46(39)56-42;/h13,26,28-33,37,41,51H,1,14-25,27H2,2-12H3,(H-,56,57,58,59,61);/q-1;+2/p-1/b34-26+;/t32-,33-,37+,41+,51-;/m1./s1 checkY
    Key: ATNHDLDRLWWWCB-AENOIHSZSA-M checkY
  • InChI=1S/C55H73N4O5.Mg/c1-13-39-35(8)42-28-44-37(10)41(24-25-48(60)64-27-26-34(7)23-17-22-33(6)21-16-20-32(5)19-15-18-31(3)4)52(58-44)50-51(55(62)63-12)54(61)49-38(11)45(59-53(49)50)30-47-40(14-2)36(9)43(57-47)29-46(39)56-42;/h13,26,28-33,37,41,51H,1,14-25,27H2,2-12H3,(H-,56,57,58,59,61);/q-1;+2/p-1/b34-26+;/t32?,33?,37-,41-,51+;/m0./s1
    Key: ATNHDLDRLWWWCB-WJQLOWBJSA-M
  • CCC1=C(C2=NC1=CC3=C(C4=C([N-]3)C(=C5[C@H]([C@@H](C(=N5)C=C6C(=C(C(=C2)[N-]6)C=C)C)C)CCC(=O)OC/C=C(\C)/CCCC(C)CCCC(C)CCCC(C)C)[C@H](C4=O)C(=O)OC)C)C.[Mg+2]
  • COC(=O)C9C(=O)c6c(C)c3N7c6c9c2C(CCC(=O)COCC=C(C)CCCC(C)CCCC(C)CCCC(C)C)C(C)c1cc5N8c(cc4n([Mg]78n12)c(c=3)c(CC)c4c)c(C=C)c5C
Properties
C55H72MgN4O5
Molar mass 893.509 g·mol−1
Appearance Green
Odor Odorless
Density 1.079 g/cm3[1]
Melting point ~ 152.3 °C (306.1 °F; 425.4 K)[2]
decomposes[1]
Insoluble
Solubility Very soluble in ethanol, ether
Soluble in ligroin,[2] acetone, benzene, chloroform[1]
Absorbance See text
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Chlorophyll a is a specific form of chlorophyll used in oxygenic photosynthesis. It absorbs most energy from wavelengths of violet-blue and orange-red light, and it is a poor absorber of green and near-green portions of the spectrum.[3] Chlorophyll does not reflect light but chlorophyll-containing tissues appear green because green light is diffusively reflected by structures like cell walls.[4] This photosynthetic pigment is essential for photosynthesis in eukaryotes, cyanobacteria and prochlorophytes because of its role as primary electron donor in the electron transport chain.[5] Chlorophyll a also transfers resonance energy in the antenna complex, ending in the reaction center where specific chlorophylls P680 and P700 are located.[6]

  1. ^ a b c Anatolievich KR. "Chlorophyll a". chemister.ru. Archived from the original on 2014-11-29. Retrieved 2014-08-23.
  2. ^ a b Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
  3. ^ "Photosynthesis". Archived from the original on 2009-11-28.
  4. ^ Virtanen O, Constantinidou E, Tyystjärvi E (December 2020). "Chlorophyll does not reflect green light - how to correct a misconception". Journal of Biological Education. 56 (5): 552–559. doi:10.1080/00219266.2020.1858930.
  5. ^ Raven PH, Evert RF, Eichhorn SE (2005). "Photosynthesis, Light, and Life". Biology of Plants (7th ed.). W. H. Freeman. pp. 119–127. ISBN 0-7167-9811-5.
  6. ^ Papageorgiou G, Govindjee (2004). Chlorophyll a Fluorescence, A Signature of Photosynthesis. Advances in Photosynthesis and Respiration. Vol. 19. Springer. pp. 14, 48, 86.