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Chelation of Ce III and Pr III by N , N′ ‐Bis(pyridoxylideneiminato)ethylene, a Schiff Base Ligand Derived from Vitamin B6: Synthesis, Structural Features and TGA Evaluations of [M(Hpyr 2 en)(pyr 2 en)]· n H 2 O (M = Ce III , n = 2; Pr III , n = 8)
Author(s) -
Manzoni de Oliveira Gelson,
Bortolotto Ricardo,
Ribas Douglas G.,
Faoro Eliandro,
Schulz Lang Ernesto,
Burrow Robert A.
Publication year - 2009
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200801338
Subject(s) - deprotonation , chemistry , chelation , ethylene , ligand (biochemistry) , schiff base , stereochemistry , metal , medicinal chemistry , inorganic chemistry , ion , catalysis , organic chemistry , biochemistry , receptor
The neutral Schiff base N , N′ ‐bis(pyridoxylideneiminato)ethylene (H 2 pyr 2 en) reacts with CeCl 3 · 4H 2 O and PrCl 3 · 4H 2 O to give [Ce(Hpyr 2 en)(pyr 2 en)] · 2H 2 O ( 1 ) and [Pr(Hpyr 2 en)‐(pyr 2 en)] · 8H 2 O ( 2 ). In the two bimolecular chelate systems, the endo hydroxyl groups of the rings undergo deprotonation by transferring one proton to the pyridinic nitrogen atoms. This confirms the ability of the pyridoxal containing ligand H 2 pyr 2 en to form stable heavy metal chelates with unusual coordination polyhedra. Complexes 1 and 2 show coordination number 8, and represent a distorted quadratic antiprismatic arrangement. To date no other references have been made to the complexation of Ce and Pr by any vitamin B 6 derivative. The synthesis and the structure elucidation of 1 and 2 represent a contribution to the research on prevention and therapy of damages caused by heavy elements.