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Complexes of 2,2′,2″‐Nitrilotriphenol. Part 3. Crystal and Molecular Structures of Three Aluminium Complexes
Author(s) -
Müller Edgar,
Bürgi HansBeat
Publication year - 1987
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19870700305
Subject(s) - chemistry , trigonal bipyramidal molecular geometry , crystallography , pyridine , ligand (biochemistry) , quinuclidine , molecule , crystal structure , stereochemistry , pentagonal bipyramidal molecular geometry , bipyramid , nucleophile , bond length , medicinal chemistry , biochemistry , receptor , organic chemistry , catalysis
Crystal and molecular structures of three Al(III) complexes of the tripod ligand 2,2′,2″‐nitrilotriphenolate ( I ) are presented. They all show 5‐coordinate Al in approximately trigonal bipyramidal geometry, with an external nucleophile X occupying the second axial position. X is OH − in[Al( I )(OH)] − [Hquin] + (quin = quinuclidine), N in [Al( I )(py)] (py = pyridine), and one of the O‐atoms of a second molecule in the dimeric [(Al( I )) 2 ]. Correlated variations in the axial bond lengths of the trigonal bipyramid are observed: [(Al( I )) 2 ]: Al–N int. = 2.094 Å, Al–O ext. = 1.850 Å; [Al( I )(py)]: Al–N int. = 2.153 Å, Al–N ext. , = 1.992 Å; [Al( I )(OH)] − : Al–N int. = 2.278 Å, Al–O ext. = 1.765 Å. They are interpreted in terms of a dissociative reaction path at the Al(III) centre.