Self-assembled two-dimensional salicylaldimine lanthanum(III) nitrate coordination polymer

The unprecedented self-assembled formation of a two-dimensional salicylaldimine lanthanum coordination polymer is proved by the X-ray diffraction analysis of new lanthanum(III) nitrate complex containing the N,N′-bis(salicylidene)-1,4-butanediamine ligand L, which was prepared in situ through one-step template [2+1] Schiff base condensation of salicylaldehyde with 1,4-butanediamine in the presence of lanthanum(III) nitrate ion and characterized by spectroscopic (IR, ESI-MS, UV–Vis, and 1H NMR) data and microanalysis. The complex displays an infinite [La2L4(NO3)6]∞ polymeric structure based on networks of ten-coordinated La(III) nodes linked by bridging L ligands. The coordination geometry around the lanthanum is a distorted bicapped dodecahedron. This polymer can be described as composed from the columns of dimers connected into chains, via the flexible chain parts of ligands.

Graphical abstractThe unprecedented self-assembled formation of a two-dimensional salicylaldimine lanthanum coordination polymer is proved by the X-ray diffraction correlated with spectral characterization of new lanthanum(III) nitrate complex containing the N,N′-bis(salicylidene)-1,4-butanediamine ligand which was prepared in situ through one-step template [2+1] Schiff base condensation of salicylaldehyde with putrescine in the presence of lanthanum(III) nitrate ion.Figure optionsDownload full-size imageDownload as PowerPoint slide