Coordination chemistry of alkali and alkaline earth cations—synthesis and X-ray structural analysis of sodium(picrate)-(1,10-phenanthroline) 2

Abstract

The complex Na(Pic)(PHEN) 2 (Pic = picrate, Phen = 1,10-phenanthroline) is unique in being a cluster with two independent Na ions in the asymmetric unit. Na(1) is seven-coordinated involving two N atoms of two Phen molecules (NaN, 2.492–2.622 Å), phenoxide O (NaO −, 2.381 Å) and an o-nitro-oxygen (NaONO, 2.584 Å) of Pic(1) and also to the phenoxide O (NaO −, 2.656 Å) of Pic(2). Na(2) is six-coordinated through four N atoms of the two other Phen molecules (NaN, 2.510–2.570 Å), phenoxide O (NaO −, 2.317 Å) and o-nitro-oxygen (NaONO, 2.592 Å) of Pic(2). Thus Pic(2) serves as a linkage residue between two clusters. The Phen molecules are planar and nearly perpendicular to each other in either cluster.