A pentagonal bipyramidal scandium(III) complex: Synthesis and characterization of diaqua(2,6-diacetylpyridine bis-semicarbazone)scandium(III) hydroxide dinitrate

Abstract

Inorganica Chimica Acta 20 (1976) L27-L28. doi:10.1016/S0020-1693(00)94066-0Received by publisher: 1976-08-18Harvest Date: 2016-01-04 12:19:51DOI: 10.1016/S0020-1693(00)94066-0Page Range: L27-L2

Dynamic combinatorial libraries for the recognition of heavy metal ions

“…[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] The reversible interactions used in this study are hydrazone exchange 23-27 and metal-ligand interactions. 28 Recently, we exploited the reversibility of the hydrazone linkage in ligands containing a 2,6-bis-hydrazonopyridine core (here referred to as N 3 O 2 ligands) [29][30][31][32][33][34][35] to study their behaviour in dynamic combinatorial libraries (DCLs). 10 Dialdehyde 1 and dihydrazide 2a (Fig.…”

Metal induced folding: synthesis and conformational analysis of the lanthanide complexes of two 44-membered hydrazone macrocycles

“…[3][4][5] We have recently demonstrated that a series of large and flexible [1 + 1] and [2 + 2] macrocycles containing acylhydrazone moieties can be efficiently synthesised using a dynamic combinatorial chemistry 6 approach. 7,8 As pentadentate N 3 O 2 acylhydrazone ligands 9 have been shown to be good ligands for lanthanide ions, [10][11][12] we investigated the complexation of lanthanide ions with two 44-membered [2 + 2] acylhydrazone containing macrocycles, the N 10 O 8 1 and the N 8 O 10 2. Here we report solution studies of the interaction of 1 and 2 with lanthanum(III), europium(III) and dysprosium(III) along with the X-ray structures of 1·2MeOH, [Eu (1) …”

Monodentate and bidentate trifluoroacetato ligands in bis(trifluoroacetato)-(N-methyl-meso-tetraphenylporphyrinato)thallium(III)—a new dynamic 4:3 piano stool seven-coordinate geometry

“…When the OAc − of 1 was replaced by a relatively bulkier trifluoroacetate group, CF 3 CO 2 − the coordination number (CN) decreases from 8 for 1 to 7 for bis(trifluoroacetato) -(N -methyl -meso -tetraphenylporphyrinato)thallium(III), Tl(N Me tpp)(CF 3 CO 2 ) 2 (2). Seven-coordinate complexes of the metal ion (M(III)) (M = Sc [9], Ti [10], V [11], Cr [12,13], Fe [13,14] and In [15][16][17][18][19]) have also been reported. However, until now there were no X-ray structural data available for M(III) complexes of porphyrin with seven-coordinate geometry and the stereochemistry for seven-coordination is not reported in mononuclear thallium(III) complexes.…”