Synthesis, crystal structure, and porosity of 1D coordination polymer of neodymium(III) with isonicotinic acid and dimeric complex of neodymium(III) with nicotinic acid

Abstract

A 1D coordination polymer [Nd 3 (INA) 9 (H 2 O) 6 ] n (I) and a dimeric complex with mononuclear asymmetric unit [Nd(NA) 3 (H 2 O) 2 ] (II) (HINA = isonicotinic acid and HNA = nicotinic acid) were synthe sized. The compounds were characterized by elemental analyses, infrared spectroscopy and single crystal X ray diffraction studies (CIF file CCDC nos. 938976 (I) and 939061 (II). X ray crystal structure analysis reveals that both compounds exhibit rich structural chemistry. Compounds I and II belong to the monoclinic system with space group P2 1 /c. Thermogravimetric analysis has been performed to investigate their thermal stability. The coordination polymer I has meso porous structure with average diameter of pores (~4 nm) and BET surface area 13.62 m 2 /g.

Synthesis and structural characterization of dinuclear cerium(III) and erbium(III) complexes of nicotinic acid or 2-aminobenzoic acid

“…Nicotinate ions exhibit three different coordination modes to the cerium ions: a bidentate bridging (µ-η 1 : η 1 bidentate bridging), bidentate chelating (η 2 chelating) and triply coordinate in which one oxygen atom of the chelate bridges the two cerium atoms of a dimer (µ-η 2 : η 1 tridentate bridging). Such a bridging tridentate (O,O,O') mode has been observed in the isostructural Nd(III) complex [32] as well as in La(III) [42] and Ce(III) [43] [52,53]. Although the amino group is not bound to the lanthanide cations, it participates in stabilization of hydrogen bonded networks [41,42].…”

“…The crystal structures of these compounds are often characterized by strong hydrogen bonding [4][5][6][19][20][21].Aromatic carboxylic acids with two different coordinating atoms i.e., the nitrogen of a heterocyclic ring and carboxylic oxygen atoms, can coordinate with one or two other metal ions that can help in extending the structure by bridging [31][32][33][34][35][36][37]. The lanthanide complexes of such ligands, e.g.,isonicotinic acid and pyridine-2,6-dicarboxylic acid have shown an excellent bridging role in constructing novel MOFs with interesting optical and magnetic properties [31][32][33][34][35].…”