# A Step beyond the Feltham–Enemark Notation: Spectroscopic and Correlated ab Initio Computational Support for an Antiferromagnetically Coupled M (II)– (NO)− Description of Tp*M (NO) (M = Co, Ni) | Journal of the American Chemical Society

2015-08-14

Abstract. Dinitrosyl iron complexes (DNICs) are organometallic-like compounds formed endogenously as products of degradation of iron-sulfur clusters by NO or its … The Enemark-Feltham Notation. The Enemark-Feltham notation is frequently used to keep track of the oxidation states of transition-metal nitric oxide (NO) complexes [1]. This is due to the fact that NO is a non-innocent ligand that can become oxidized (to NO +) or reduced (to NO-) when binding to a transition metal center, M. Enemark-Feltham Notation. The Enemark-Feltham notation is used to describe the number of d-type electrons present in a complex. It is deliberately ambiguous, because the true oxidation state of a metal coordinated by non-innocent ligands is often unclear.

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Therefore, it is very difficult to define its oxidation state. Due to the complicated electronic structures of transition-metal complexes with NO, the oxidation state of the metal NO unit is typically indicated using the Enemark−Feltham notation, in which the metal nitrosyl is denoted by {M(NO) x} n. With regard to the utilisation of valence-to-core X-ray emission spectroscopy (V2C XES) for quantifying small-molecule activation such as N 2 in iron-dinitrogen complexes, we developed V2C XES as a spectroscopic ruler for the quantitative determination of NO oxidation state in Fe-NO complexes, which was circumvented by invention of Enemark-Feltham notation [5]. species, a ferrous NO complex, or {FeNO}7 in Enemark−Feltham notation (15). Because the electronic structures of transition metal nitrosyls can be ambiguous (3), this notation is useful in counting electrons of transition metal NO complexes by treating the metal−NO unit as a single entity.

Submitted by Kyle Grice / DePaul University on Thu, 11/08/2018 - 22:00. My Notes.

## Enemark-Feltham Notation {M(NO) x}n n = # metal d electrons + # electrons in NO p* {FeI(NO)+}7 {FeII(NO.)}7 {FeIII(NO)-}7. Dithiolenes O 2: the most famous actor/non

“ minor third” etc.). It is assumed that the intonation of any given interval is Aug 24, 2019 After Franz Richter Herf and Rolf Maedel, as well as after Ezra Sims, the conventional notation is completed by three additional signs (arrows) The acronym used by Joe Monzo to stand for Helmholtz / Ellis / Wolf / Monzo notation (the long name was first used by Paul Erlich on the Tuning List). Monzo's I really did try to find the answer on my own; it's difficult to use a dictionary when the symbols are ideograms.

### 2014-02-01

Iron NitrosylComplexes. NO ligands are redoxnon-innocent, which means NO has multiple accessible redox states under common conditions. In addition, Iron has common several redox and spin-states (Fe2+vs. Fe3+, high spin or low spin). Description.

{MNO}0 complexes according to the Enemark–Feltham notation
The Enemark-Feltham notation is frequently used to keep track of the oxidation states of transition-metal nitric oxide (NO) complexes [1]. This is due to the fact
configuration in the Enemark–Feltham notation [40], were characterized by a combination of analytical and spectro- scopic techniques, including elemental
Enemark-Feltham notation) appeared promising candidates for further investigations on the reactivity of DNICs and on synthetic improvements for possible
+ complex, 1+, of Enemark–Feltham electronic notation {Fe(NO)}7-{Fe(NO)2}9, is readily obtained via myriad synthetic routes, and shown to be spin coupled. on heme and non-heme iron-nitrosyl complexes, which are labeled {FeNO}(7) in the Enemark-Feltham notation, but they have had very limited success in…
Written in the Enemark-Feltham notation, the d-electron count in Cr−N−O unit is five. The results are the same if the nitrosyl ligand were considered NO+ or
Apr 16, 2019 compounds of the {FeNO}7 type (in this Enemark–Feltham notation, read “7” as the sum of metal-d and NO- π* electrons, i.e., 7 + 0 for FeI +
cording to the Enemark-Feltham notation) have received special attention due to the intermediacy of nitroxyl-heme adducts in a variety of catalytic processes
Soc. 2008, 130, 15288. Fe III /NO − Fe II /NO • Fe I /NO + : {FeNO} 7. (Enemark- Feltham notation, Coord. Chem.

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Iron–nitrosyls have fascinated chemists for a long time due to the noninnocent nature of the NO ligand that can exist in up to five different oxidation and spin states. Coordination to an open-shell iron center leads to complex electronic structures, which is the reason Enemark−Feltham introduced the {Fe–NO}n notation. In this work, we succeeded in characterizing a series of {Fe–NO}6 Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): https://via.library.depaul.edu Two mononuclear ruthenium nitrosyl complexes with a nitrogen-rich ligand coordinated molecular framework, [RuII(dmdptz)(bpy)(NO)]n+ (dmdptz: N,N-dimethyl-4,6-di(pyridin-2-yl)-1,3,5-triazin-2-amine and bpy: 2,2′-bipyridine), Enemark and Feltham notation {RuNO}6, [4]3+ (n = 3), and {RuNO}7, [4]2+ (n = 2), have 2015-08-14 · Consideration of this mechanism illustrates the utility of the Enemark-Feltham notation for designation of iron-nitrosyl complexes , which is {Fe(NO) x} y where ‘x’ denotes the number of nitrosyls coordinated to the iron and ‘y’ is the number of electrons in the d orbitals of the iron plus the number of unpaired (π*) electrons from the •NO(s). 1 Bonding and structure o 1.1 Linear vs bent nitrosyl ligands o 1.2 Bridging nitrosyl ligands o 1.3 Enemark-Feltham notation 2 Representative classes of compounds o 2.1 Homoleptic nitrosyl complexes o 2.2 Roussin Red and Black Salts 3 Preparation 4 Reactions 5 Applications 6 References Bonding and structure (Top) the HOMO and LUMO of CO. The remaining 5% are converted to an off-path and nonproductive species, a ferrous NO complex, or {FeNO} 7 in Enemark−Feltham notation .

A Step beyond the Feltham–Enemark Notation: Spectroscopic and Correlated ab Initio Computational Support for an Antiferromagnetically Coupled M (II)– (NO) − Description of Tp*M (NO) (M = Co
The adoption of linear vs bent bonding can be analyzed with the Enemark-Feltham notation. In their framework, the factor that determines the bent vs linear NO ligands is the sum of electrons of pi-symmetry. Complexes with "pi-electrons" in excess of 6 tend to have bent NO ligands. bonding can be analysed with the Enemark-Feltham notation.

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### 5-ish Slides about Enemark-Feltham Notation. Kyle Grice. DePaul University. November 2018. Iron NitrosylComplexes. NO ligands are redoxnon-innocent, which means NO has multiple accessible redox states under common conditions. In addition, Iron has common several redox and spin-states (Fe2+vs. Fe3+, high spin or low spin).

(1) Three electronic structure models May 2, 2014 18), that serves as a metallodithiolate donor ligand to an {Fe(NO)2}9 unit ( Enemark–Feltham notation). Such an electron count represents the Dec 13, 2016 Lancaster and coworkers propose that this species is a diamagnetic ferric NO complex, or {FeNO}6 in the Enemark−Feltham notation (see Fig. Aug 14, 2015 Consideration of this mechanism illustrates the utility of the Enemark-Feltham notation for designation of iron-nitrosyl complexes [12], which is Skrivet i Enemark-Feltham notation, d elektronantalet är {CrNO} 5 . Resultaten är desamma om nitrosylliganden ansågs NO + eller NO - . 18), som tjänar som en metalloditiolatdonorligand till en {Fe (NO) 2 } 9 enhet (Enemark-Feltham notation 19 ). Ett sådant elektronantal representerar den The Enemark-Feltham notation is frequently used to keep track of the oxidation states of transition-metal nitric oxide (NO) complexes. This is due to the fact that NO is a non-innocent ligand that can become oxidized (to NO +) or reduced (to NO -) when binding to a transition metal center, M. Enemark-Feltham Notation The Enemark-Feltham notation is used to describe the number of d-type electrons present in a complex.