Macrocyclic Ligands

Bowman‐James, Kristin

doi:10.1002/0470862106.ia122

Cited by 4 publications

(2 citation statements)

References 111 publications

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“…Macrocyclic ligands are important class of organic compounds that usually contain heteroatoms that are capable of chelating with substrates in their molecules [ 1 ]. Most macrocyclic ligands contain nine or more atoms including at least three electron pair donors in their rings [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, Antimicrobial Studies and Corrosion Inhibition Potential of 1,8-dimethyl-1,3,6,8,10,13-hexaazacyclotetradecane: Experimental and Quantum Chemical Studies

et al. 2016

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The macrocylic ligand, 1,8-dimethyl-1,3,6,8,10,13-hexaazacyclotetradecane (MHACD) was synthesized by the demetallation of its freshly synthesized Ni(II) complex (NiMHACD). Successful synthesis of NiMHACD and the free ligand (MHACD) was confirmed by various characterization techniques, including Fourier transform infra-red (FT-IR), proton nuclear magnetic resonance (1H-NMR), carbon-13 nuclear magnetic resonance (13C-NMR), ultraviolet-visible (UV-vis), and energy dispersive X-ray (EDX) spectroscopic techniques. The anti-bacteria activities of MHACD were investigated against Staphylococcus aureus and Enterococcus species and the results showed that MHACD possesses a spectrum of activity against the two bacteria. The electrochemical cyclic voltammetry study on MHACD revealed that it is a redox active compound with promising catalytic properties in electrochemical applications. The inhibition potential of MHACD for mild steel corrosion in 1 M HCl was investigated using potentiodynamic polarization method. The results showed that MHACD inhibits steel corrosion as a mixed-type inhibitor, and the inhibition efficiency increases with increasing concentration of MHACD. The adsorption of MHACD obeys the Langmuir adsorption isotherm; it is spontaneous and involves competitive physisorption and chemisorption mechanisms. Quantum chemical calculations revealed that the energy of the highest occupied molecular orbital (HOMO) of MHACD is high enough to favor forward donation of charges to the metal during adsorption and corrosion inhibition. Natural bond orbital (NBO) analysis revealed the presence of various orbitals in the MHACD that are capable of donating or accepting electrons under favorable conditions.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, Antimicrobial Studies and Corrosion Inhibition Potential of 1,8-dimethyl-1,3,6,8,10,13-hexaazacyclotetradecane: Experimental and Quantum Chemical Studies

et al. 2016

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“…Macrocyclic compounds occupy a unique segment of chemical and biological sciences. Because of the size, complex structural organization, and limited conformational freedom, they are of interest as ligands for investigations of binding interactions with various targets, from small simple ions to huge molecules like peptides and DNA. − These investigations have achieved significant success in the area of drug discovery. , Nowadays, various macrocyclic drugs are involved in clinical practice. Complexation of macrocyclic ligands toward metal cations rather differs from linear analogues.…”

Section: Introductionmentioning

confidence: 99%

The First Characterized Coordination Compounds of Macrocyclic Ligands Including Incorporated Tetrazole Rings

Войтехович

Lyakhov

Ivashkevich

et al. 2017

Crystal Growth & Design

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16-tetraene (L), reacts with copper(II) chloride or copper(II) tetrafluoroborate hexahydrate to give complexes [Cu 3 Cl 6 L 2 ] (1) or [CuL 2 (H 2 O) 2 ](BF 4 ) 2 (H 2 O) (2), respectively. According to single crystal X-ray analysis, both complexes were found to be coordination polymers. In the crystal structure of complex 1, there are neutral linear bibridged trinuclear units Cu 3 Cl 6 , in which the copper atoms are linked together by double chlorine bridges. Neighboring Cu 3 Cl 6 units are bonded to each other by two bridging macrocyclic ligands L due to coordination bonds Cu−N between terminal copper atoms of Cu 3 Cl 6 units and the tetrazole ring nitrogen atoms of ligands L to form polymeric chains. In complex 2, the copper atom is bonded to three ligands L via the tetrazole ring nitrogen atoms, and to two water molecules, with formation of a squarepyramidal coordination of the metal. In this complex, one of two independent ligands L shows monodentate coordination, whereas another ligand plays the role of a bridge between two neighboring copper atoms being responsible for formation of polymeric cationic chains [CuL 2 (H 2 O) 2 ] n 2n+ . A complex system of hydrogen bonds connects the chains and the anions BF 4 − into a three-dimensional network. The temperature-dependent magnetic susceptibility measurements of complex 1 revealed that the copper(II) ions were ferromagnetically coupled showing a coupling constant J of 50 cm −1 .

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Few-layer graphene modified with nitrogen-rich metallo-macrocyclic complexes as precursor for bifunctional oxygen electrocatalysts

Morales

Masa

Andronescu

et al. 2016

Electrochimica Acta

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Macrocyclic Ligands

Abstract: The main classes of macrocyclic ligands are classified. Emphasis is placed on O and N donors but S, P and As‐donors are also included. The macrocyclic effect and anion coordination are both discussed.

Cited by 4 publications

References 111 publications

Synthesis, Characterization, Antimicrobial Studies and Corrosion Inhibition Potential of 1,8-dimethyl-1,3,6,8,10,13-hexaazacyclotetradecane: Experimental and Quantum Chemical Studies

Synthesis, Characterization, Antimicrobial Studies and Corrosion Inhibition Potential of 1,8-dimethyl-1,3,6,8,10,13-hexaazacyclotetradecane: Experimental and Quantum Chemical Studies

The First Characterized Coordination Compounds of Macrocyclic Ligands Including Incorporated Tetrazole Rings

Few-layer graphene modified with nitrogen-rich metallo-macrocyclic complexes as precursor for bifunctional oxygen electrocatalysts

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