Premium
Synthesis and Structural Characterization of Bis(salicylaldiminato)magnesium Complexes of Varying Aggregation and Coordination State
Author(s) -
Quinque Geoffrey T.,
Oliver Allen G.,
Rood Jeffrey A.
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201100256
Subject(s) - chemistry , crystallography , magnesium , ligand (biochemistry) , crystal structure , monomer , square pyramidal molecular geometry , yield (engineering) , stereochemistry , bond length , coordination geometry , nuclear magnetic resonance spectroscopy , coordination number , molecular geometry , hydrogen bond , molecule , organic chemistry , ion , biochemistry , materials science , receptor , metallurgy , polymer
A series of salicylaldiminato ligands [C 6 H 5 N=CHC 6 H 4 OH ( 1 L), 2,6‐ i PrC 6 H 3 N=CHC 6 H 4 OH ( 2 L), and 2,6‐ i PrC 6 H 3 N=CH‐3,5‐ t Bu 2 C 6 H 2 OH ( 3 L)] were treated with Bu 2 Mg in the presence of the appropriate solvent system to yield the crystalline compounds [( 1 L 6 Mg 3 ) · thf] ( 1 ), [( 2 L 2 Mg · thf)] ( 2 ), and [ 3 L 2 Mg] ( 3 ). The products were characterized by 1 H and 13 C NMR spectroscopy and single‐crystal X‐ray diffraction. X‐ray crystallographic analysis revealed that 1 adopts a unique trimeric aggregation state consisting of six‐coordinate magnesium centers. Substitution of the ligand backbone resulted in the formation of the monomeric species 2 and 3 . X‐ray crystallographic analyses revealed 2 as a five‐coordinate, distorted square‐pyramidal magnesium complex and 3 as a four‐coordinate, distorted tetrahedral species. Inspection of the metrical parameters in 1 – 3 indicates a decrease in the Mg–O and Mg–N bond lengths and an increase in the N–Mg–O bite angle with a decreasing coordination number at magnesium.