Ferrocensubstituierte 1,3-bidentate Liganden und ihre heteronuklearen Übergangsmetallchelate

Abstract

Synthesis and properties of ferrocene substituted 1,3‐bidentate ligands of the types N‐ferrocenylthioureas and ferrocene substituted 3‐mercaptopropenals, 3‐amino‐thiopropenones and 1,3‐diketones are described. The discussion is focussed on the reaction of these potentially chelating molecules with transition metal ions. Acid strengths, complex stabilities, molecular structures, NMR investigations and the electrochemical behaviour of ligands and/or complexes are reported.

Electrocatalytic Oxidation of Nitric Oxide at 6,17-Diferrocenyl-dibenzo[b,i]5,9,14,18-tetraaza[14]annulen]-nickel(II) Modifed Electrodes

“…The 6,17-diferrocenyl-dibenzo[b,i]5,9,14,18-tetraaza [14]annulen-nickel(II) 1 was prepared as described previously [24,25].…”

Reactions of halogens with Pt(ii) complexes of N-alkyl- and N,N-dialkyl-N′-benzoylthioureas: oxidative addition and formation of an I2 inclusion compound

“…These intermolecular I • • • I distances are considerably shorter than the sum of the van der Waals radii for two iodine atoms (4.20 Å 32 ), and are only slightly longer than the range of distances (3.3 to 3.5 Å ) found for covalent bond formation in polyiodide anions. 33,34 These intermolecular interactions seem to be only slightly 'weaker' than those in crystalline I 2 The Pt(IV) complexes might be expected to have shorter Pt-S and Pt-O bond lengths, but the observed elongation of these bonds can probably be ascribed to the presence of the bulky iodide ligands in the octahedral coordination sphere. Complex 6 crystallizes in a P1 space group.…”

“…). This suggests that the N(1A)-H(6A) group in ligand A acts as a donor for intramolecular hydrogen bonds to Br(1) and Br (4), and that the N(1B)-H(6B) group in ligand B similarly acts as hydrogen bond donor to Br (2) and Br(3) ( Table 2). Such interactions account for the distortions from ideal octahedral geometry, leading to the larger than 90 • bond angles for the coordination sphere of the Pt(IV) centre (see Table 1).…”

“…Ligands of the type N,N-dialkyl-N -aroyl(acyl)thiourea (HL 1 ; R 1 2 NC(S)NHC(O)R 2 , R 1 = alkyl, R 2 = alkyl or aryl) are known to form stable, neutral coordination compounds with a variety of transition metal ions, 1 a number of which have been structurally characterized; for example, Co(III), 2 Ni(II), 3 Cu(II), 4 Zn(II), 5 Ru(III), 6 Rh(III), 7,8 Pd(II), 9 Ag(I), 10 Cd(II), 5 Re(I), 11 Pt(II), 8, 12 and Hg(II). 13 These ligands show a pronounced affinity for coordination to the platinum group metals (PGMs), 14 which allows for their potential application in the solvent extraction, preconcentration, separation and trace determination of the PGMs.…”

Crystal structure of cis-copper(II) complex with N-(di-n-propylcarbamothioyl)cyclohexanecarboxamide ligand

“…Thiourea derivative ligands are tend to coordinate to both transition group and main group metal ions via both sulfur and oxygen providing a multitude of bonding possibilities [11][12][13]. Copper(II) complexes of acyl thiourea ligands have been described repeatedly in the literature with regard to their synthesis and general characterization [14][15][16] and molecular structures [17][18][19][20]. These copper(II) complexes are in every case nearly square-planar neutral bis chelates with a cis arrangement of the ligands around the copper atom.…”