Unusual nitro-coordination of europium(iii) and terbium(iii) with pyridinyl ligandsElectronic supplementary information (ESI) available. CCDC 886729 (5a), 886730 (5cEu), 886731 (5cTb) and 886732 (6Eu). For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c2dt31308a

• Main Authors: de Bettencourt-Dias, Ana, Bauer, Sebastian, Viswanathan, Subha, Maull, Brandi C, Ako, Ayuk M
• Format: Journal Article
• Language: English
• Published: 28.08.2012
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c2dt31308a

A new ligand family based on picoline, bipyridine and terpyridine containing a nitro moiety has been synthesized and its coordination and sensitization ability for lanthanide ions has been studied. Three new complexes were characterized by X-ray single crystal diffraction and all three show uncommon coordination of the nitro moiety to the lanthanide ion. 5cTb , a terpyridine-nitro derivative with Tb(NO 3 ) 3 , crystallizes in the orthorhombic space group Pbca with a = 15.125(3), b = 13.776(3), c = 18.716(4) Å, and V = 3899.8(13) Å 3 and is isostructural with its Eu( iii ) analog ( 5cEu ) with cell parameters a = 15.1341(4), b = 13.7070(4), c = 18.8277(5) Å. 6Eu , a tripodal amine with a nitro-derivatized pyridine with Eu(CF 3 SO 3 ) 3 , crystallizes in the triclinic space group P 1&cmb.macr; with a = 11.067(2), b = 11.633(2), c = 12.772(3) Å, = 110.94(3), = 97.49(3), = 91.42(3)° and V = 1518.1(5) Å 3 . Finally, ligand 5a , a bipyridine-nitro derivative, crystallizes in the orthorhombic space group P 2 1 / n with a = 3.7128(3), b = 11.7806(8), c = 19.9856(14) Å, = 92.925(2)° and V = 873.01(11) Å 3 . All four ligands show sensitization of Eu( iii ) and Tb( iii ) luminescence. A new ligand family based on picoline, bipyridine and terpyridine containing a nitro moiety has been synthesized and its coordination and sensitization ability for lanthanide ions has been studied.