Synthesis and Spectral Studies of Iron(III), Ruthenium(III) and Rhodium(III) Complexes with New Tetraaza Macrocyclic Ligands

Abstract

Complexes of iron(III), ruthenium(III) and rhodium(III) with three new tetraaza macrocyclic ligands, oxo4bzo3[14]triene-N4 [TBTAC14Tone], oxo4bzo2[14]diene-N4 [DBTAC14Tone] and oxo4bzo2[15]diene-N4 [DBTAC15Tone] have been prepared and characterised. The complexes are found to have the formulae [FeLCl2]Cl. 2H2O, [RuLCl2]Cl. 3H2O and [RhLCl2]Cl. 2H2O. The cations adopt a trans-dichloro configuration with the six-coordinated trivalent metal ions in a pseudo-octahedral geometry.

Synthesis and Spectral Investigations of Manganese(II), Cobalt(II), Nickel(II), Copper(II) and Zinc(II) Complexes of New Polydentate Ligands Containing a 1,8-Naphthyridine Moiety

“…The loss of matter in this temperature region corresponds to two water molecules and the loss in this temperature region confirms that the water molecules are coordinated to the metal ion [18]. In the high temperature region, the DTA curves show exothermic peaks which indicate the loss of organic matter [19], and in all the cases the residue left corresponds to the respective metal oxides [11]. These results confirm that the formula of the complexes is [M(L) 2 HN and HMPN).…”

“…As part of our research, we have developed a number of polydentate ligands containing amide groups [6][7][8][9][10][11]. 1,8-Naphthyridines constitute a group of very important biodynamic agents whose coordination chemistry is investigated very little [12][13][14].…”

Antioxidant, Antimicrobial and Antitumor Studies of Transition Metal Complexes Derived from N‐(2‐Aminoethyl)‐1,3‐Propanediamine with DFT Calculations and Molecular Docking Investigation

“…In addition to bands according to υ(C‐H)and δ(C‐H) modes in the regions 2850–3000 cm −1 and 1350–1480 cm −1 respectively. The stretching frequencies of the amine groups were shifted towards higher or lower frequencies after complexation indicating the coordination of the 1 ry and 2 nd amine nitrogen atoms to the metal ions . Also, the spectra of all solid complexes except [Ni (AEPD)]Cl 2 exhibit a broad band in the region 3411–3500 cm −1 was assigned to the ν (OH) of water, which confirms the presence of water molecule (coordinated or lattice) .…”

Synthesis and Spectral Investigation of Co(II), Ni(II), Cu(II) and Zn(II) Complexes with Novel N4 Ligands

“…In the IR spectra of the complexes, the stretching frequencies of the amine groups are found to have shifted by 20-40 cm -1 towards low frequency side indicating the coordination of the primary and secondary amine nitrogen atoms to the metal ions [27,28]. All the complexes except [Zn(APMP'D)Cl2] and [Zn(APMCD)Cl2] exhibit broad absorption between 3600 and 3000 cm -1 confirming the presence of water molecules.…”

“…In chelates of such imines there is a possibility of greater electron delocalization involving the metal d-orbitals and aromatic ring -cloud, which offers somewhat greater stability to the chelate rings formed. In view of this interesting aspect and as part of our interest in developing new N, O donor ligands and their complexes [24][25][26][27][28][29] the present investigations are taken up. In view of the striking similarity between 1, 2 and 3, and less quantum of literature on Schiff bases derived from 3 and more so their reduced analogues, we have prepared four new N4 ligands by condensing 2-aminonicotinaldehyde with different diamines and then reducing them.…”