Structural Systematics of Lanthanide(iii) Picrate Solvates: Molecular, Mononuclear Ln(pic)3(trimethylphosphate)3 Arrays
Eric J. Chan A , Jack M. Harrowfield A B D , Brian W. Skelton A , Alexandre N. Sobolev A and Allan H. White A CA School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Hwy, Perth, WA 6009, Australia.
B Current address: Institut de Science et d’Ingénierie Supramoléculaires, Université de Strasbourg, 8, allée Gaspard Monge, Strasbourg, 67083, France.
C Deceased.
D Corresponding author. Email: harrowfield@unistra.fr
Australian Journal of Chemistry 73(6) 462-467 https://doi.org/10.1071/CH19176
Submitted: 18 April 2019 Accepted: 6 June 2019 Published: 3 July 2019
Abstract
Adducts of the form Ln(pic)3(tmp)3 (Ln = lanthanide(iii); pic = picrate = 2,4,6-trinitrophenoxide; tmp = trimethylphosphate, (MeO)3PO) have been prepared for extremal Ln = La, Lu and some intermediate members, also Y, and characterised by single crystal X-ray structure determinations as unsolvated, mononuclear, molecular species. The lanthanide atom has nine-coordinate, tri-capped trigonal prismatic stereochemistry in all cases, the picrate components behaving as O,O′-bidentate ligands chelating through the phenoxy- and an adjacent O-nitro oxygen atom, thus: [Ln(tmp-O)3(pic-O,O′)3]. Two isomeric forms are found, one mer in which the three unidentate tmp-O ligands coordinate in cis-sites spanning the upper and lower triangles and a capping site of the coordination sphere, and fac, in which all three unidentate ligands occupy the mutually cis-sites of one triangular face. The mer isomer has been described as an isomorphous series in a monoclinic P21/c, Z 4, form, for Ln = La, Ce, Pr, Nd, Sm, Gd, Lu, and Y, presumptively accessible for the full gamut of Ln. The fac-isomer also crystallises in a monoclinic P21/c form, Z 8, two independent molecules of similar stereochemistry here comprising the asymmetric unit and described for Ln = Eu, Lu(isomorphous); it has also been described in a triclinic P
, Z 2 form for Ln = La.
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