Open AccessDetermination of double decker sandwich structured La‐substituted chlorophyll a by EXAFS
Author(s) -
Tao Y.,
Zhao G.,
Yang J.,
Ikeda S.,
Jiang J.,
Hu T.,
Chen W.,
Wei Z.,
Hong F.
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500019543
Subject(s) - porphyrin , lanthanum , lanthanide , chemistry , extended x ray absorption fine structure , chlorophyll , ring (chemistry) , chlorophyll a , photochemistry , crystallography , absorption spectroscopy , inorganic chemistry , organic chemistry , ion , physics , biochemistry , quantum mechanics
As a representative natural porphyrin derivative, it is interesting to know the chemical form of lanthanide in chlorophyll a. We select the natural fern dicranopteris dichotoma, the most lanthanide‐concentrated plant known, to isolate the chlorophyll a for our study. It is found by EXAFS that lanthanum substitutes in the magnesium position in chlorophyll and coordinates with the porphyrin ring. The lanthanum is seen to have a similar coordination structure to a sandwich‐type lanthanide complex, with the La surrounded by eight nitrogen atoms from two porphyrin rings with average La‐N bond length of 2.65 Å.