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Complexation of Metal Ions by Ligands
Published in James F. Pankow, Aquatic Chemistry Concepts, 2018
When a ligand has one electron pair available for binding to a metal, it is said to be “monodentate” or “unidentate” (i.e., “single-toothed”). Ligands with two, three, four, etc. available electron pairs that are located geometrically on the ligand such that they are capable of binding simultaneously with a metal ion are referred to as being “bidentate,” “tridentate,” “tetradentate,” etc., respectively. Generically, the terms “multidentate” and “polydentate” are used to refer to any ligand with two or more binding sites.
Rational design of hydrothermal in situ ligand synthesis to fabricate two new coordination polymer
Published in Inorganic and Nano-Metal Chemistry, 2023
Yu-Mei Dai, En Tang, Ji-Hui Lin
Single-crystal X-ray diffraction analysis reveals that compound 1 crystallizes in the monoclinic crystal system with P2(1)/c. There are two organic ligands, one of which is BPP and the other is TPC in the compound 1. The synergistic construction of the complexes by in situ ligands and the original ligand have rarely been reported. The asymmetric unit of compound 1 is composed of three crystallographically independent CuI ions, three I ions, two BPP ligands, half TPC ligand. The TPC ligand in compound 1 acts as a tetradentate ligand to coordinate four Cu. The Cu(1) I ion is four-coordinated by two N atoms from BPP, and two I ions. The Cu(2) I ion is four-coordinated by two I- ions and two N atoms, one nitrogen atom from BPP ligand and the other from TPC. The Cu(3) I ion is also four-coordinated by two I ions and two N atoms, one nitrogen atom from BPP ligand and the other from TPC (Figure 1). The Cu–N bond lengths vary from 2.039(2) to 2.088(2) Å, which are comparable to those in Cu compounds reported.[28]
Kinetic investigations of the formation of iron(IV) oxido complexes
Published in Journal of Coordination Chemistry, 2022
Florian J. Ritz, Markus Lerch, Jonathan Becker, Siegfried Schindler
Besides N-tetradentate macrocycles tripodal ligand other systems have been applied; here especially the guanidine substituted tris-{2-aminoethyl}amine (tren) framework turned out to be suitable to support formation of an Fe(IV) oxido complex [12, 13]. In 2009, England et al. reported the synthesis and spectroscopic characterization of a high spin iron(IV) oxido complex with TMG3tren (1,1,1-tris{2-[N2-(1,1,3,3-tetramethylguanidino)]ethyl}amine) as a ligand [14]. Preventing a methyl-group oxidative self-decay by deuteration of the methyl groups, they were able to obtain a high quality molecular structure in 2010 of this complex [15]. The tripodal ligand DMEG3tren (4) in Scheme 1 is a sterically more restrictive derivative of TMG3tren [16].
Investigations of new five-coordinate dinuclear Co(II) and Cu(II) salamo-based complexes
Published in Journal of Coordination Chemistry, 2022
Yang Zhang, Li-Li Li, Ying Huang, Tao Feng, Wen-Kui Dong
For a long time, salen-based compounds, as an important class of chelating ligands, have been one of the research hotspots in the field of coordination chemistry. Salen-based compounds and their derivatives are a kind of multifunctional tetradentate N2O2 chelating ligand in modern coordination chemistry [1]. N and O atoms have massive electronegativity and can react with various metal ions to form numerous metal complexes with stable structures and various properties [2, 3]. O atoms have been introduced into the imine part of salen-based ligands [4–6], resulting in imine complexes with [–HC = NO(CH2)nON = CH–] structural salamo-based ligands [7–9]. Due to the huge electronegativity of the introduced O atoms, the N2O2 coordination sphere has altered significantly, which may lead to a novel structure and better performance of the complexes formed by metal ions and salamo-based ligands [10–12]. Salamo-based ligands usually lose two or more hydroxyl hydrogen atoms and then coordinate with metal ions to form stable metal complexes [13, 14]. Salen-based and salamo-based ligands and their metal complexes have unique physical and chemical properties [15–17]. They have great application prospects in supramolecular structure [18–20], biology [21–23], electrochemistry [24–26], catalysis [27–31], ion recognition [32–35], magnetic materials [36–38] and luminescent materials [39–42].