Question

Q2 (5 points) Part A (2 marks) Briefly explain how variations in ligand field stabilization energy (LFSE) account for the double-humped curve observed in the hydration energy of high spin M2+ ions across the first period of the d-block? Part B (2 marks) What is the relationship between the magnitude of the pairing energy, P, and the size of the ligand field splitting parameter, Ao , in a weak field octahedral complex? Briefly explain? Part C (1 mark) How does the size of Ao account, in part, for the colourful nature of many d- metal complexes?

Answer 1

Past A for Hydration energy curve for first pesied of d-block high skin mat ions can be shown as chaoto No This is for observed hydration enerzy L This is for theoretical hydration at znat energy Vib Sc2+ Ti 2+ Vat Co2+ my 24 beob ttttt dd2 d3 de d edo dois now & I berrol N ord Obseoved hydrokan energy al Calculated by docties energy + CHE) S mot sol, LASE or CFSE FOR trupi oo et boLESE = ligand field stabilization eneszy, or I nnocated wito (cfse crystal field stabilization energy Observed H. E - Theoretical eneogy (when LFSE FO) Observed HE = Theoretical HE (when LESE = 0 . boshlotr boid loow b tundo olof utofi b on Because LASE provides extra ie for do, dr, stabilization, ie why o cuore for observed hydration energy is o different from cure for theoretical bydration energy whereas for Mart (as high spies) and 2n?+ (do) and for do configuration : LESE ta holije. I why their observed, Hie, is same as theoretical His This is the reason of double humped curve observed dlo complex

thell whital Part-B fer weak field octa Redoal complex; relation between of and Do Pons # for an octahedral complex; splitting can be given as : wodowa d (excited state) d (Ground State) If a weak field octahedral complex is formed ice. if the ligands attached with metal are weak; then they can't do the pairing of elections for them, pairing einergy (P.) is high as compared to do (ligand a field splitting parameter). The relation between P 3.4 moitovuzd and Do is; Ip oo 2014 havoldo for cg , Let us talk about du weak field octahedoal canfles; di sotto obvod 3 00 wow a to ali moitos itidrich w yang dito obrust korrasto og 40 Tercited states 22 214/7/ 2 h b C This is wrong; e pairing energy how do 3.14 This is correct is high ) wsan betrend olducha
Part c: Depending upon the size of (delta)o or LFSE, transitions of electrons taking place from t2g to eg are of different energies i.e. on the basis of energy of specific wavelength absorbed by the electron, colour differs. The colour which is absorbed, complimentary colour of that one is shown by the complex.