Questions tagged [coordination-compounds]

This tag is for questions concerning coordination compounds including but not limited to ligand properties, metal properties, orbital splitting, micro- and macroscopic properties of entire complexes etc. For complexes where carbon monoxide is the only ligand, use the [carbonyl-complexes] tag instead. For organic catalysts or proteins, the tag is applicable if the question is about the metal’s direct coordination sphere.

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26 views

Is triazanido(methyl)iron(IV) low-spin?

I was messing around on WebMO when I suddenly remembered that tetrakis(4-norbonyl)iron(IV) was diamagnetic, despite its tetrahedral coordination. Knowing that late metal complexes in extremely high ...
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205 views

How does cyclopentadienyl anion act as reducing agent?

I am a second year university student, so I'm afraid my chemistry isn't great. I am looking for an explanation of how the $\ce{Cp-}$ anion acts as a reducing agent. To contextualise - in a simple ...
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Nature of Bisphosphonates Binding onto Hydroxyapatite in the Aqueous Phase

In many studies I've read, bisphosphonates (first image) are said to bind remarkably onto bone hydroxyapatite (second image) crystals. It was reported by J. Roelofs et al., (2008) that this mechanism ...
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Coordination compounds hybridisation and orbitals [duplicate]

Which d orbital out of ( d z squared and d x squared minus y squared) is involved in hybridisation during formation of Fe(CO)5 and why is that particular orbital is preferred over the other? I felt ...
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100 views

Does the spin of electron in d half-filled d-orbital changes while forming low spin complex?

Recently I learned how VBT explains the formation of coordination complexes. But I am stuck at a point that seems hard to digest for me. Consider a metal ion having an electronic configuration as ...
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69 views

Can nickel(IV) be stabilised in water using appropriate ligands?

Platinum(IV) is perfectly stable in water as its hexachlorido complex, and so is palladium(IV). However, nickel(IV) is not stable in water even in its hexafluorido complex- the exchange-inertness of ...
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Is tetraoxidocobaltate(V) low-spin

After hearing that hexaamminecobalt(III) and hexafluoridonickelate(IV) are both low-spin due to the central metals' high oxidation states(even though both bear pi-donor ligands), I began to wonder if ...
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30 views

Why are ligand orbitals always lower in energy than the metal orbitals in the ligand field theory?

The below image has been used to represent the ligand field theory for transition metals: (Source: https://chemed.chem.purdue.edu/genchem/topicreview/bp/ch12/ligand.php) Also, other similar images ...
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27 views

What are the Ionic Properties of Co-ordinate Covalent Bonds? [closed]

In my 10th grade book, it says that A coordinate bond has properties of both covalent and ionic bonds. Therefore, it is also called dative or co-ionic bonds. I understand that it has properties of ...
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The mechanism of discoloration due to changes in the state of CP

I don't know the mechanism of discoloration due to phase change. https://pubs.rsc.org/en/content/articlelanding/2019/cc/c9cc02172h In the above paper, Cu(I) in CP1 (Figure 1 a) has a tetrahedral ...
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159 views

Spin-only magnetic moment of [Fe(en)(bpy)(NH₃)₂]²⁺

The one that can exhibit highest paramagnetic behaiour among the following is ($\ce{gly}$ is glycinato; $\ce{bpy}$ is 2,2ʹ-bipyridine): (a) $\ce{[Pd(gly)2]}$ (b) $\ce{[Fe(en)(bpy)(NH3)2]^2+}$ (c) $\ce{...
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38 views

Why does energy of non-axial d-orbitals decrease in an octahedral complex?

In an octahedral complex, if we assume the metal ion to be inside a cube then ligands will approach from its faces. So the axial d orbitals will experience more electronic repulsion as compared to ...
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29 views

Why total stereoisomers is 1 even if no geometrical isomers and optical-isomers are present [closed]

Let's for example take the complex structure type $\ce{MA_6}$, What will be the Total number of Stereo-isomers (=[Geometrical-isomers]+[optical-isomers]). My effort was that There will be no G.I and ...
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155 views

Total number of Isomers of [Co(NH3)5(NO2)](NO3)2 [closed]

I encountered this question in my country's Chemistry textbook of class 12. No solutions are published, but the answer given at the back states - "There are 10 possible isomers. (Hint: There are ...
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233 views

Does solvate isomers exist for coordination compounds with ammonia solvent as ligand?

I could find many sources confirming the hydrate isomerism(with water as solvent) but I couldn't find any information about any other solvent. In all the sources "hydrate/solvate isomerism" ...
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80 views

Is a tetrahedral complex with two symmetric bidentate ligands optically active?

If the shape of of a complex $\ce{M(AA)2}$ (with $\ce{AA}$, a bidentate ligand) is tetrahedral, then is it optically active? Currently I know that it is optically inactive, but I want to know the ...
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For a structure of a compouund optically active, what is the number of stereo isomers if no geometrical isomers are present?

Suppose for example the compounds $\ce{M(AA)3}$ and $\ce{M(AA)3bc}$, with $\ce{M}$, the central metal atom and $\ce{AA}$, a bidentate ligand. What is the total number of stereo-isomers of both? I was ...
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Do strong field ligands always give d2sp3 hybridisation and weak field ligands give sp3d2 for coordiantion number 6 [closed]

i am actually doing coordination compounds but get confused when it comes to hybridization so wanted to create a short of mine for the exam
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36 views

Multiplicity prefixes for complex compounds with organic ligand

Consider the compound $[\ce{Ni(gly)_2}]$, with $\ce{gly}$ denoting glycinate ligand. Should the name be bis-(glycinato)nickel(II) or diglycinatonickel(II) In my book, it's written that the prefixes &...
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56 views

How to "draw" a coordination bond (dashed bond) in MOLFILE?

How can we "draw" a coordination bond (dashed bond) in MOLFILE? I cannot find a bond property or option that would allow me to choose such a thing. So many drawings of organo-metallic ...
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319 views

What is the chemical composition of Ferrous Ferrocyanide?

To this day, iron-cyanide complexes confuses me. So, I want to settle this once and for all. After scavenging the internet, I gathered the following result: $$ \ce{Ferr} \color{blue}{\ce{ous}}~\ce{...
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Do coordination complexes with stronger ligands form more stable complexes?

I read that chelate complexes generally are more stable than monodentate complexes. However, I noticed that in the case of $\ce{[Fe(CN)6]^3-}$ and $\ce{[Fe(en)3]^3+}$, this is not observed as the ...
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how do i identify bridging ligands in a given complex

is there any way to identify bridged complexes ? my teacher just drew the complex and I failed to understand why OH should act as a brigding ligand... Im aware carbonyls generally act as bridging ...
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47 views

Coordination number of metals in complexes

The co-ordination number of a metal is fixed in which way? My chemistry textbook says, " The secondary valence is equal to the coordination number and is fixed for a metal." Obviously, the ...
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69 views

Preparation of Ferrocene

Although many synthesis methods of ferrocene are discussed in literature, I want to know about the black precipitation which occurs when $\ce{FeCl2・4H2O}$ in $\ce{DMSO}$ solution reacts with ...
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225 views

Comparing intensity of colour in coordination compounds

I had given an examination recently in which the question asked was: Write the decreasing order for the intensity of color in $\ce{[CoCl4]^{2-}}$, $\ce{[Co(CN)4]^2-}$, $\ce{[Co(H2O)6]^2+}$ What my ...
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325 views

What should be the IUPAC name of (NH3)5Co-NH2-Co(NH3)4(H2O)]?

What should be the IUPAC name of $\ce{(NH3)5Co-NH2-Co(NH3)4(H2O)]}$? This is similar to $\ce{[(NH3)5Co-NH2-Co(NH3)5](NO3)5}$, i.e. μ-amido-bis[pentaamminecobalt(III)] nitrate. But the two parts are ...
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239 views

What is the correct molecular orbital diagram for the d orbitals in platinum for the tetraammineplatinum(II) complex?

I am trying to construct the diagram of $\mathrm{d}$ orbitals in the tetraammineplatinum(II) complex. According to the angular overlap model, $\mathrm{d}$ orbitals are going to look like those in the ...
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98 views

Limitations on the 18-electron rule

The 18-electron rule and the corresponding methods for counting the total valence electrons of transition metal complexes are among the most useful basic tools in modern inorganic chemistry, ...
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104 views

Why does adding excess NaOH prove amphoteric nature?

When 3+ hexaaqua ions react with hydroxide ions, the following set of reactions occurs: When we get to stage 3, a neutral ion has formed, and a white precipitate is created. Now, we know that for ...
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295 views

Why is [M(AB)2] a geometrical isomer?

Our teacher told us that for coordination number 4 and tetrahedral shape $\ce{[M(AB)2]}$ doesn't have a plane of symmetry, so it shows optical isomerism. What if we take a plane passing through the ...
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308 views

Why does iron carbonyl have five carbonyl groups instead of six or four?

When finely divided iron combines with carbon monoxide, we get the complex $\ce{Fe(CO)_5}$. Why the number 5? It doesn't even relate to the orbital theory wherein we can see the number of empty and ...
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Action of Fuller's Earth on Marble and Limestone

Using Fuller's earth is a very common and harmless way to treat marble and limestone that has been damaged/corroded by atmostpheric pollutants such as PM2.5/PM10 carbon particles (Soot) , Oxides of ...
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141 views

How to understand the chemical formula of Prussian blue complex w.r.t its crystal structure?

Note: Just to be clear, I do not refer to "complex molecules" (i.e. "complex" as "complicated"), but to actual complexes. I am trying to understand the structure of ...
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100 views

How can we predict the formula of a coordination compound by just knowing the ligand and central metal? [closed]

Question: On complete reaction of $\ce{FeCl3}$ with oxalic acid in aqueous solution containing $\ce{KOH}$, resulted in the formation of product A. The secondary valency of $\ce{Fe}$ in the product A ...
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Can actinides form diamagnetic coordination complexes?

I am not sure how accurate I can predict the magnetic properties of actinide diamagnetic complexes, due to the fact that they share the F-block electron as Lanthanides, which are already tricky, ...
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289 views

Which compound of these following have electrovalent, covalent, coordinate as well as hydrogen bond?

Which compound have electrovalent, covalent, coordinate as well as hydrogen bond ? A) $\ce{[Cu(H2O)4]SO4.H2O}$ B) $\ce{[Zn(H2O)6]SO4.H2O}$ C) $\ce{[Fe(H2O)6]SO4.H2O}$ D) $\ce{[Fe(H2O)6]Cl3}$ Answer ...
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387 views

Why is it advised to use neutral ferric chloride solution while performing confirmatory test for acetate ions? [duplicate]

The reaction of $\ce{FeCl3}$ with $\ce{CH3COO-}$ is $$\ce{3Fe^{+3} +6CH3COO- +H2O<=> [Fe3(OH)2(CH3COO)6]^{+} +2H^{+}}$$ Recently I read that a solution of $\ce{FeCl3}$ hydrolyses very quickly to ...
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123 views

Using bis- over di- as multiplicative prefix in the nomenclature of urea for coordination complexes [duplicate]

The compound $\ce{[CuCl2(NH2CONH2)2]}$ is named as dichloridobis(urea)copper(II). However, why is it not dichloridodiureacopper(II)? I know that we use bis-, tris-, tetrakis- when the ligand's name ...
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What is the effect of the oxidation number of iron on the properties of ferroin complex?

In our labratory expermient, we have determined the isobestic point for iron(III) complexation with ortho-phenanthroline, and we have also studied iron(II) complexation with ortho-phenanthroline by ...
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Is tetrachloridocuprate(II) formed when dilute hydrochloric acid is added to a solution containing tetraamminecopper(II)?

As observed in the lab, when concentrated $\ce{HCl}$ is added to a solution of deep blue $\ce{[Cu(NH3)4]^2+}$ a green color appears indicating the partial formation of the yellow colored $\ce{[CuCl4]^...
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57 views

What is electronic configuration of manganese in the manganate(VI) anion?

The electronic configuration of the central atom of $\ce{[MnO4]^2-}$ if given out to be $e^1\,t_2^0$ I want to know how to identify which one of the d-orbitals does this configuration utilizes because ...
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71 views

Why is the trans-effect of nitrile ion (cyanide) weaker than acetonitrile (methyl cyanide) in octahedral chromium complexes?

I was reading a paper which built a series of trans-philicity (a term they coined to indicate both kinetic trans-effect and thermodynamic trans-influence) from extensive calculations. And I found that ...
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143 views

Explanation of the trans-effect (thermodynamic and kinetic) for octahedral transition metal complexes

The thermodynamic trans effect refers to the ground state weakening of the metal-ligand bond in a complex by a ligand trans to it. The kinetic trans effect is the lablisation of a ligand in a complex ...
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174 views

What is a correct primitive hexagonal unit cell to describe a monolayer of molybdenum sulfide?

I searched the coordinates or reduced coordinates of primitive cell of mono layer hexagonal $\ce{MoS2}$, but there are lots of different structures and coordination. For example, material project give ...
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56 views

Can oxygen form six bonds

Oxygen is a small size atom known to make only two bonds (sigma bonds), it may also form coordination bonds {oxygen ion (2-) uses its outer shell in coordination (only s & p orbitals) that ...
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1answer
493 views

What is the IUPAC Name of [Cr(NH3)5Cl]Cl2.NH3? [duplicate]

What is the IUPAC Name for the complex $\ce{[Cr(NH3)5Cl]Cl2.NH3}$? I can't even find it through the internet and also by employing a find in "IUPAC's Red Book".
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190 views

Why does NH3 cause pairing in case of some metal complexes and doesn't in case of others?

I was met with a question that required me to find which complex is an outer orbital complex, and two of the options included $\ce{ [Ni(NH3)6]^2+}$ and $\ce{[Co(NH3)6]^3+}$, I want to know why $\ce {...
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1answer
120 views

Coordination complex - nitrito-N & nitrito-O

I am currently learning the coordination compounds and encountered a new isomerism called linkage isomerism. I am thinking that if I want to get some $\ce{[Co(NO2)6]^3-}$, I should have to dissolve $\...
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33 views

My EDTA titration isn't giving the right titre

I am, as a fun off-syllabus investigation, looking at hard water and how effective the EDTA titration method is, for permanent and temporary hard water. I ran a titration today and had horrific ...

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