The crystal structure of tris-(2,2′,6′,2″-terpyridyl)europium(III) perchlorate

Abstract

An X-ray crystallographic analysis of tris-(2,2',6',2"-terpyridyleuropium( 111) perchlorate has confirmed the nona-co-ordination of the metal ion, believed to be the first example of nine-co-ordination involving only nitrogen ligands.

‘Lanthanide contraction’ in [Ln(BTP)3](CF3SO3)3 complexes

“…complex cations are in good agreement with literature reports on BTP [28], BTP derivative complexes [7,29,30] or complexes with comparable structural motifs arising from ligands which are related to BTP in terms of symmetry and coordination behaviour [5,[31][32][33][34][35][36][37][38][39][40][41][42]. Selected geometrical parameters from our (La, Pr, Nd, Eu) and literature (Sm, Tm, Yb) [28] X-ray studies and from our computations are compared in Table 2.…”

Structural Systematics of Rare Earth Complexes. XV Tris(2,2′:6′,2″-terpyridine)lanthanoid(III) Tris(perchlorate) Complexes

“…The two forms of the Eu adduct were obtained from the same solution as previously noted in the literature. 5 General procedural details for the structure determinations are given in an accompanying paper; 9 specific details are as follows (see also Tables 1-7 C49H40 · 33Cl3LaN11O12 · 67, M 1231 · 2. Trigonal, space group P 3c1 (C 3 3v , No.…”

“…In the present paper, we turn our attention to systems of 1 : 3 Ln/tpy stoichiometry, using the X = ClO 4 − array as our starting point, there being already one such system, [Eu(tpy) 3 ] (ClO 4 ) 3 , whose structure is described in preliminary form without coordinates in the literature, 5 together with a report of a similar compound with 3,3 :5,3 -polymethylenebridged tpy. 6 In that report acetonitrile was chosen as solvent, as adopted for the present work, although other reports have described the use of ethanol 7 and pentane.…”

Systematics and the Properties of the Lanthanides

“…There is a group of tris(tridentate ligand)Ln complexes with a CN of 9 [180][181][182][183][184][185][186][187][188][189][190][191] which have both oxygen and nitrogen donor atoms.…”