109733-26-8Relevant articles and documents
Installation of internal electric fields by non-redox active cations in transition metal complexes
Kang, Kevin,Fuller, Jack,Reath, Alexander H.,Ziller, Joseph W.,Alexandrova, Anastassia N.,Yang, Jenny Y.
, p. 10135 - 10142 (2019)
Local electric fields contribute to the high selectivity and catalytic activity in enzyme active sites and confined reaction centers in zeolites by modifying the relative energy of transition states, intermediates and/or products. Proximal charged functio
Selective Metal-Ligand Bond-Breaking Driven by Weak Intermolecular Interactions: From Metamagnetic Mn(III)-Monomer to Hexacyanoferrate(II)-Bridged Metamagnetic Mn2Fe Trimer
Goswami, Somen,Singha, Soumen,Saha, Indrajit,Chatterjee, Abhishikta,Dey, Subrata K.,Gómez García, Carlos J.,Frontera, Antonio,Kumar, Sanjay,Saha, Rajat,Saha, Rajat
, p. 8487 - 8497 (2020)
Metal-ligand coordination interactions are usually much stronger than weak intermolecular interactions. Nevertheless, here, we show experimental evidence and theoretical confirmation of a very rare example where metal-ligand bonds dissociate in an irreversible way, helped by a large number of weak intermolecular interactions that surpass the energy of the metal-ligand bond. Thus, we describe the design and synthesis of trinuclear Mn2Fe complex {[Mn(L)(H2O)]2Fe(CN)6},2- starting from a mononuclear Mn(III)-Schiff base complex: [Mn(L)(H2O)Cl] (1) and [Fe(CN)6]4- anions. This reaction implies the dissociation of Mn(III)-Cl coordination bonds and the formation of Mn(III)-NC bonds with the help of several intermolecular interactions. Here, we present the synthesis, crystal structure, and magnetic characterization of the monomeric Mn(III) complex [Mn(L)(H2O)Cl] (1) and of compound (H3O)[Mn(L)(H2O)2]{[Mn(L)(H2O)]2Fe(CN)6}·4H2O (2) (H2L = 2,2′-((1E,1′E)-(ethane-1,2-diylbis(azaneylylidene))bis(methaneylylidene))bis(4-methoxyphenol)). Complex 1 is a monomer where the Schiff base ligand (L) is coordinated to the four equatorial positions of the Mn(III) center with a H2O molecule and a Cl- ion at the axial sites and the monomeric units are assembled by π-πand hydrogen-bonding interactions to build supramolecular dimers. The combination of [Fe(CN)6]4- with complex 1 leads to the formation of linear Mn-NC-Fe-CN-Mn trimers where two trans cyano groups of the [Fe(CN)6]4- anion replace the labile chloride from the coordination sphere of two [Mn(L)(H2O)Cl] complexes, giving rise to the linear anionic {[Mn(L)(H2O)]2Fe(CN)6}2- trimer. This Mn2Fe trimer crystallizes with an oxonium cation and a mononuclear [Mn(L)(H2O)2]+ cation, closely related to the precursor neutral complex [Mn(L)(H2O)Cl]. In compound 2, the Mn2Fe trimers are assembled by several hydrogen-bonding and π-πinteractions to frame an extended structure similar to that of complex 1. Density functional theoretical (DFT) calculations at the PBE1PBE-D3/def2-TZVP level show that the bond dissociation energy (-29.3 kcal/mol) for the Mn(III)-Cl bond is smaller than the summation of all the weak intermolecular interactions (-30.1 kcal/mol). Variable-temperature magnetic studies imply the existence of weak intermolecular antiferromagnetic couplings in both compounds, which can be can cancelled with a critical field of ca. 2.0 and 2.5 T at 2 K for compounds 1 and 2, respectively. The magnetic properties of compound 1 have been fit with a simple S = 2 monomer with g = 1.959, a weak zero-field splitting (|D| = 1.23 cm-1), and a very weak intermolecular interaction (zJ = -0.03 cm-1). For compound 2, we have used a model with an S = 2 monomer with ZFS plus an S = 2 antiferromagnetically coupled dimer with g = 2.009, |D| = 1.21 cm-1, and J = -0.42 cm-1. The metamagnetic behavior of both compounds is attributed to the weak intermolecular π-πand hydrogen-bonding interactions.
The functionality of the hybrid systems driven by molecular dimension of the guest copper Schiff-base complexes entrapped in Zeolite-Y
Kumari, Susheela,Choudhary, Archana,Ray, Saumi
, (2019)
On encapsulation inside the supercage of zeolite-Y planar Cu (II)–Schiff base complexes show the modified structural, optical and functional properties. The electronic effect of the different substituent groups present in the catalyst plays the decisive r
Synthesis, structural characterization, and antibacterial activity of Cu(II) and Zn(II) complexes with tetradentate Schiff bases
Liu, Huan-Yu
, p. 210 - 215 (2016)
Biological activity study on Cu(II) and Zn(II) complexes is a challenging issue because of the activity of ligands could be modulated by complexation. A new dinuclear copper(II) complex, [Cu2(L1)2]·2CH3OH (1), a
Experimental and theoretical structural determination, spectroscopy and electrochemistry of cobalt (III) Schiff base complexes: immobilization of complexes onto Montmorillonite-K10 nanoclay
Kianfar, Ali Hossein,Tavanapour, Sanaz,Eskandari, Kiamars,Azarian, Mohammad Hossein,Mahmood, Wan Ahmad Kamil,Bagheri, Maryam
, p. 369 - 380 (2018)
Abstract: The [Co(5-XSalen)(PEt3)(H2O)]ClO4 (where Salen?=?bis(salicylaldehyde)1,2-ethylenediamine and X?=?H, MeO, NO2, Br) complexes were successfully synthesized and characterized by different techniques such
Three novel mononuclear Mn(III)-based magnetic materials with square pyramidal: Versus octahedral geometries
Dolai, Malay,Mondal, Abhishake,Liu, Jun-Liang,Ali, Mahammad
, p. 10890 - 10898 (2017)
A series of new manganese schiff base complexes have been prepared and characterized by single crystal X-ray diffraction studies, which showed that all the three complexes are mononuclear; 1 and 2 have square pyramidal geometry, whereas 3 has an octahedra
Alteration of electronic effect causes change in rate determining step: Oxovanadium(IV)–salen catalyzed sulfoxidation of phenylmercaptoacetic acids by hydrogen peroxide
Kavitha,Subramaniam
, (2019/11/13)
Sulfoxidation of a series of phenylmercaptoacetic acids (PMAA) by hydrogen peroxide catalysed by oxovanadium(IV)–salen complexes has been carried out spectrophotometrically in 100% acetonitrile medium. The formation and involvement of hydroperoxovanadium(
