Third Test Flashcards
Pass Class
What is the similarities between Lewis acid base theory and coordinated compounds?
Ligands acts Lewis base which donates electron density while the metal center acts as the Lewis acid.
H- F- N3- O2- CN- OH- H20 NH3 CO PPh3 NO+
Hydrido Fluoro Nitrido Oxo Hydroxo Aqua Ammine Carbonyl Triphenyl phosphine Nitrosyl
What is the definition of Chelating Ligands and what are the denominations?
Chelating ligands are ligards which host multiple coordination sites.
Bidente
Tridente
Tetradente
Multiple ligands en acac phen pby dppe tp
ethelynediammine acetylacetonato 1,10-phenanthroline 2,2-bipyridyl bis(diphenylphosphino)ethane pyrazoylborato
How is the stability of a ligand determined?
The stability can be determined by the strain of the ring. A hexagone having the best stability.
Rule Number one of nomenclature (ion correspondence)
[Ag(NH3)2] Cl
Cations comes before the anion
diamminesilver(I) chloride
Rule Number two of nomenclature (coordination sphere)
[Co(NH3)6]2+
The brackets indicate the coordination sphere. The ligands is named first hexaammine cobalt(II)
Rule Number three of nomenclature (count of ions) 3A 3B (state reason of three B) [Fe(en)3]2+ [Cu(bpy)2]Br [Ag(NMeH2)2]+
The number of ligands of each kind is indicated by a numerical prefix. (you should already know them from 2-10)
tris(ethyleneammine) iron(II)
bis(2,2’-bipyridyl)copper(I) bromide
bis(methylammine)silver(I) ion
Rule Number four of nomenclature (alphabetical order)
[Co(NH3)4Cl2]+
Ligands attached to the metal center are ordered by alphabetical order
tetramminedichlorocobalt(I)
Rule Number five of nomenclature (anions)
[Fe(PPh3)3H]2+
Anionic ligands end with the prefix -O
Hydridotris(triphenylphosphine)iron(III) ion
Rule Number six of nomenclature (oxidation state) [Pt(NH3)4]2+ [Fe(en)3]SO4 6B MnO4
Include oxidation state of metal with a roman numerical. Even if the charge is 0. If the metal is involved in the anion add -ate as suffix.
tetrammineplatenum(III)
tris(ethelynediammine)
permanagate
When would you change the ending of a metal in coordination nomenclature?
When the metal is part of the anion then the suffix ate but when it is part of the cation we add the roman numeral.
What are the classical names for metals involved in anions?
Tin- Stanum -Stanate
Lead- Plumbum- Plumbate
Iron- Ferrate
How can right and left handed isomerism be notated in nomenclature?
Delta signifies the right handed isomer while capital lambda stands for left handed. With the upright triangle is pointing up and coming out of the plane then it is delta. If the upright triangle is in the plane of the board then it is capital lambda.
What is constitutional isomerism?
Molecules have same formula but different connectivity of atoms.
What is hydrate (solvate) isomerism?
Water has two different roles in coordination compound. When coordinated to the metal center it is referred to as “aqua”. When it is a second coordination sphere, it is referred to as hydrate.
What is ionization isomerism?
Molecules have same formula but gives different ions upon dissociation. Ex) [Co(NH3)5SO4] NO3 vs [Co(NH3)5NO3] SO4
What is coordination isomerism ?
Molecules have same formula, different coordination around metals.
What is linkage isomerism?
Ligands coordinate to metal center through different atoms (they are ambidentate)
What are coordination numbers?
They describe the number of coordination sites occupied ; they give the geometry about the metal center.
What is the chelate effect?
The ability of a ligand to act as a better Lewis base because its multiple metal bonding sites.
What is crystal field theory?
In crystal field theory we treat ligands as negative point charges that interact with the d-orbitals of transition metals. It predicts repulsion and coordination.
What is ligand field theory?
It is an expansion of crystal field theory that includes positive and neutrally charged ligands.
What does crystal field theory, coordination, and splitting diagrams have in relation?
Crystal field theory explains how much energy and steric interaction the d-orbital experience while bonding to a metal center. Orbitals with more steric interaction will have more energy.
How is a splitting diagram constructed?
First a zero field is established. Followed by a spherical field. A spherical field is the step where the ligands are surrounding the metal center through the axis in a spherical fashion.
In what manner will the energy of the D-orbitals of the splitting diagram be decided?
The energy will correlate with the axis the ligand bonds with.
What is ligand stabilization energy and how is it calculated?
LFSE quantifies the difference in energy between the electronic configurations due to d-orbitals splitting and energy gap.
What is the Barry center and how does it correlate with splitting diagrams and LFSE?
The barry center dictates the line between stability and destability. It also dictates the energy difference between the D-orbitals in the splitting diagrams in regards with the LFSE calculation.
How is LFSE calculated? For high and low spin
LSFE= (#of e- in t2G)(-.4) + (#of e- in eg*)(.6)
Calculate the amount of d electron first
CFT/LFT are related to color in what aspect?
CFT and LFT control the magnetic spectrum and spectroscope. You know how to determine color from absorption ban.
Compression and elongation and how do they relate to splitting diagrams?
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How many chemists does it take to work the Nintendo Switch ?
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