Complexes of Bismethyl-imido-triphosphoric-acid-pentakis-dimethyl-amide (TRIPA), a New Tridentate Ligand The Coordination Chemistry of Phosphoryl Compounds Containing the - N(CH 3 ) 2 Group, Part X

• Published in: Zeitschrift für Naturforschung. B, A journal of chemical sciences Vol. 27; no. 11; pp. 1324 - 1329
• Main Authors: De Bolster, M. W. G., Den Heijer, J., Groeneveld, W. L.
• Format: Journal Article
• Language: English
• Published: 01.11.1972
• ISSN: 0932-0776; 1865-7117
• DOI: 10.1515/znb-1972-1108

A number of new complexes containing TRIPA, chemical formula [ (CH 3 ) 2 N] 2 P (O) N (CH 3 )P (O) [N (CH 3 ) 2 ] N (CH 3 ) P (O) [N (CH 3 ) 2 ] 2 , is reported The compounds have the general formula M (TRIPA) n (anion) p , where M = Mg, Ca, Mn, Fe, Co, Ni, Cu, Zn, Cd (p = 2) and Al, Fe (p = 3), n=1,2 and anion stands for BF 4 ⁻, [B (C 6 H 5 ) 4 ]⁻, NO 3 ⁻ and Cl⁻. They are characterized and identified by chemical analysis and physical measurements. It is shown that the bis-compounds contain octahedrally solvated metal ions, the ligand acting as a tridentate phosphoryl donor. Electron paramagnetic resonance measurements show some distortion of the octahedrons. The mono-compounds with the nitrate anion probably possess a fivecoordinated structure whereas the chloride complexes are probably dimeric. The occurrence of more than one geometric isomer for the group [M (TRIPA) 2 ] P* is discussed. It is concluded that the s-facial and u-facial isomers may occur; a possible connection with the size of the metal ions is indicated. The mer form is rejected because of steric requirements.