Abstract
The title magnesium complex, [Mg(C21H20NO2)2(C4H8O)] n , exhibits two N,O-bidentate 2-(dimethylamino)-α,α-diphenylbenzenemethanolate ligands, forming two six-membered chelate rings. The distorted square-pyramidal coordination sphere of the MgII atom is completed by the O atom of a tetrahydrofuran ligand, with its O atom in the apical position. The O and N atoms are in a mutual trans arrangement. Except for two C—H...π interactions, no significant intermolecular interactions are observed in the crystal.
Highlights
The title magnesium complex, [Mg(C21H20NO2)2(C4H8O)]n, exhibits two N,Obidentate 2-(dimethylamino), -diphenylbenzenemethanolate ligands, forming two six-membered chelate rings
The distorted square-pyramidal coordination sphere of the MgII atom is completed by the O atom of a tetrahydrofuran ligand, with its O atom in the apical position
Except for two C—HÁ Á Á interactions, no significant intermolecular interactions are observed in the crystal
Summary
Compounds with O,N- or N,N-bidentate functionalities can be reacted with many maingroup and transition-metal compounds, in which they act as hemilabile ligands, forming six- or seven-membered chelate rings (Al-Masri et al, 2004a). The crystal structure of complex (I) (Fig. 1) exhibits a monomeric molecule with two N,O-bidentate 2-(dimethylamino)- , -diphenylbenzenemethanolate ligands, forming two six-membered chelate rings. The MgII atom is pentacoordinated by the pair of N,Obidentate ligands in a mutual trans orientation, and by the O atom of the tetrahydrofuran (THF) molecule. To the best of my knowledge, there is only one other structurally characterized monomeric complex with fivecoordinated magnesium(II) and bidentate N,O-chelating ligands, namely [(CMe2PhBTP)2Mg(THF)], (II) (Li et al, 2012). The basal plane in (I) is occupied by pairs of N and O atoms from the two N,O-bidentate ligands (O1, N1, O2 and N2). The apical position being occupied by the O atom of the THF molecule, with an Mg—O3 bond length of 2.095 (4) A , is somewhat longer than the corresponding Mg—O(THF) bond of 2.0501 (17) Ain (II). [Mg(C21H20NO2)2(C4H8O)] 701.17 Triclinic, P1 208 9.5014 (15), 13.801 (2), 15.834 (3) 66.375 (4), 89.911 (4), 81.735 (4) 1878.9 (5) 2 Mo K 0.09 0.15 Â 0.10 Â 0.08
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