High-valent manganese complexes of tetradentate schiff base ligands. ESR-active and ESR-silent dimeric species

McAuliffe, Charles A.; Parish, R. V.; Abu‐El‐Wafa, S. M.; Issa, R. M.

doi:10.1016/s0020-1693(00)87702-6

Cited by 57 publications

(15 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the mixed valence form, they provided spectral evidence that the OEC contained a cluster of manganese in different oxidation states. They showed the first 2.7Å Mn-Mn separations [99], the distance that forms the structural hallmark of the catalytic center and served as the basis for testing the famous "Dimer of dimers" structural model for the enzyme [99][100][101]. In addition, studies of the reactivity to form and destroy the dimers, along with perturbations of the properties upon protonation of these oxo bridges has proved critical to the viability of more recent water oxidation proposals [102][103][104].…”

Section: Mn-μ-o 2 -Mnmentioning

confidence: 99%

Reflections on small molecule manganese models that seek to mimic photosynthetic water oxidation chemistry

Mullins

Pecoraro

2008

Coordination Chemistry Reviews

328

252

View full text Add to dashboard Cite

Recent advances in the study of the Oxygen Evolving Complex (OEC) of Photosystem II (PSII) include structural information attained from several X-ray crystallographic (XRD) and spectroscopic (XANES and EXAFS) investigations. The possible structural features gleaned from these studies have enabled synthetic chemists to design more accurate model complexes, which in turn, offer better insight into the possible pathways used by PSII to drive photosynthetic water oxidation catalysis. Mononuclear model compounds have been used to advance the knowledge base regarding the physical properties and reactivity of high-valent (Mn(IV) or Mn(V)) complexes. Such investigations have been especially important in regard to the manganyl (Mn(IV)=O or Mn(V)≡O) species, as there are no reports, to date, of any structural characterized multinuclear model compounds that incorporate such a functionality. Dinuclear and trinuclear model compounds have also been thoroughly studied in attempts to draw further comparison to the physical properties observed in the natural system and to design systems of catalytic relevance. As the reactive center of the OEC has been shown to contain an oxo-Mn(4)Ca cluster, exact structural models necessitate a tetranuclear Mn core. The number of models that make use of Mn(4) clusters has risen substantially in recent years, and these models have provided evidence to support and refute certain mechanistic proposals. Further work is needed to adequately address the rationale for Ca (and Cl) in the OEC and to determine the sequence of events that lead to O(2) evolution.

show abstract

Section: Mn-μ-o 2 -Mnmentioning

confidence: 99%

Reflections on small molecule manganese models that seek to mimic photosynthetic water oxidation chemistry

Mullins

Pecoraro

2008

Coordination Chemistry Reviews

328

252

View full text Add to dashboard Cite

show abstract

“…The mole peaks are determined for all the Schiff bases that include chlorine atom. It is known that chlorine has two isotopes: These isotopes, their percent abundance and approximately relative proportions are as follows: 35 Cl(75.8%): 37 Cl(24.2%) (3:1). The isotopic patterns from chlorine atom are identified at the ESI-MS spectra of the all compounds.…”

Section: Mass Spectramentioning

confidence: 99%

“…Schiff bases metal complexes have many industrial uses, especially in catalysis [35][36][37], dying [38][39][40] and analytical reagents [41].…”

Section: Introductionmentioning

confidence: 99%

<b>Synthesis, spectral characterizations and antimicrobial activity of some Schiff bases of 4-chloro-2-aminophenol</b>

Çınarli¹,

Gürbüz²,

Tavman³

et al. 2011

Bull. Chem. Soc. Eth.

View full text Add to dashboard Cite

ABSTRACT ABSTRACT. A series of 4-chloro-2-[(arylmethylidene)amino]phenols (1-11) including methoxy group were synthesized using appropriate synthetic route. The structures of the Schiff bases were characterized by FT-IR, UV-Vis, ESI-MS, 1 H and 13 C-NMR spectroscopic techniques and analytical methods. A relation is observed between melting points and existence of intramolecular hydrogen bonding. IR spectra of the compounds including and not including hydrogen bonding were compared. The compounds 2 and 4 show the characteristic UV bands attributed to the NH-forms. According to the 1 H-NMR spectral data the compound 2 has the strongest intramolecular hydrogen bonding and the compound 6 shows two isomeric structure. On the other hand, antibacterial and antifungal activities of the compounds were investigated. Most of the compounds show selective activity toward S. epidermidis and C. albicans. KEY WORDS KEY WORDS KEY WORDS

show abstract

“…This type of compound is called imine, or Schiff base [1,2] and it is structurally formulated as R 1 R 2 C@NR 3 where R 1 , R 2 and R 3 can be aromatic or aliphatic groups [3]. Schiff bases have been an active research area for many years not only because of its chemical importance [4][5][6][7][8][9] but also due to their potential use in industrial [10][11][12], pharmaceutical [13][14][15] and biological fields [16][17][18][19][20][21][22]. Schiff bases showing photochromic and thermochromic properties have been particularly focused on since they have potential applications such as information storage, electronic display systems, optical switching devices, ophthalmic glasses, and so on [23].…”

Section: Introductionmentioning

confidence: 99%

Analysis of tautomeric equilibrium in (E)-4,6-dibromo-2-[(4-fluorophenylimino)methyl]-3-methoxyphenol compound

Kaştaş

Gür

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

View full text Add to dashboard Cite

High-valent manganese complexes of tetradentate schiff base ligands. ESR-active and ESR-silent dimeric species

Cited by 57 publications

References 13 publications

Reflections on small molecule manganese models that seek to mimic photosynthetic water oxidation chemistry

Reflections on small molecule manganese models that seek to mimic photosynthetic water oxidation chemistry

<b>Synthesis, spectral characterizations and antimicrobial activity of some Schiff bases of 4-chloro-2-aminophenol</b>

Analysis of tautomeric equilibrium in (E)-4,6-dibromo-2-[(4-fluorophenylimino)methyl]-3-methoxyphenol compound

Contact Info

Product

Resources

About