20 Which of the following interactions is/are contributing stabilizing factor/s to the complex? n-n interactions hydrogen bonding coordinate covalent bonding ion-dipole interactions Secondary interactions The figure below shows the mixed-ligand complex formed by amino-benzo-15- crown-5 and nitro-benzo-15-crown-5. O -ΝΗ, NH K+ 0000 NO,

20 Which of the following interactions is/are contributing stabilizing factor/s to the complex? n-n interactions hydrogen bonding coordinate covalent bonding ion-dipole interactions Secondary interactions The figure below shows the mixed-ligand complex formed by amino-benzo-15- crown-5 and nitro-benzo-15-crown-5. O -ΝΗ, NH K+ 0000 NO,

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter14: Applications Of Ultraviolet-visible Molecular Absorption Spectrometry

Section: Chapter Questions

Problem 14.13QAP: Copper(II) forms a 1:1 complex with the organic complexing agent R in acidic medium. The formation...

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The formation constant for the complexation of Mg2+ by EDTA is logKflogKf = 8.79. The conditional formation constant (Kf’) at pH 8 (αY4−αY4−= 4.2 x 10-3) is: 0.037 2.6 x 106 5.14 1.5 x 1011 6.4
You prepare a solution of protein and its ligand where the initial concentrations are [Protein] = 10 nM and [Ligand] = 10 nM. At equilibrium you measure the [PL] = 5 nM. If the protein - ligand association can be represented by: P + L <--> PL What is the dissociation constant (Kd) of the protein for the ligand under the solvent conditions you have chosen? a. 1 nM b. 0.2 nM-1 c. 5 nM d. 10 nM
The following data were obtained on the initial rates of reaction of a d-metal complex in aqueous solution. For the experiments a. [Y] = 2.7 mmol/dm3, and for experiments b. [Y] = 6.1 mmol/dm3 Conc. complex/(mmol dm-3) 8.01 9.22 12.11 Exp. a. v/ (mol dm-3 s-1) 125 144 190 Exp. b. v/ (mol dm-3 s-1) 640 730 960 (a) What is the order of reaction with respect to the complex AND the reactant Y. Choose one. (b) use the data above to calculate the rate constant. k = ________ (mol/L/s, s-1, L/mol/s, or L2/mol2/s). 3 s.f. normal format.
The following data were obtained on the initial rates of reaction of a d-metal complex in aqueous solution. For the experiments a. [Y] = 2.7 mmol/dm3, and for experiments b. [Y] = 6.1 mmol/dm3 Conc. complex/(mmol dm-3) 8.01 9.22 12.11 Exp. a. v/ (mol dm-3 s-1) 125 144 190 Exp. b. v/ (mol dm-3 s-1) 640 730 960 (a) What is the order of reaction with respect to the complex AND the reactant Y. (b) use the data above to calculate the rate constant. k = ________ (mol/L/s, s-1, L/mol/s, or L2/mol2/s). 3 s.f. normal format.
An acid solution of [Co(NH3)6]3+ replaces one amine ligand ~1013 times faster when radiated with UV-light than by boiling the acid solution. By referring to principles of this statement, compare thermal and photochemical activation of a chemical reaction.
Predict whether the following complexes would show Jahn-Teller distortion: Ammonium pentachlorooxidochromate(V), meff = 1.8 mB Potassium hexaiodidomanganate(IV), meff = 3.8 mB Potassium hexachoridocuprate(II), meff = 1.8 mB Hexaaquamanganese(II) chloride, meff = 6.0 mB
19. The association constant of protein X for ligand Y is: 100 micromolar. At what concentration of ligand is half fo the protein bound?
.A. w: Mn= 25, Co= 27, Ni= 28, Zn= 30 ------------ Complex K3[Mn(C204)3] Highly distorted. O Low distorted. O not distorted. O The magnetic moment of the -------------- complex [Ni(en)3]CI2 is * 0Bm 2.8 BM 1.8 BM O OO0O0 3.8 BM
The red color of soil is often due to the presence of iron. Metal ions are extracted from soil by stirring the soil in acid and then filtering the solution. One method for the analysis of Fe2+ is to form the highly colored Fe2+–thioglycolic acid complex. The complex absorbs strongly at 535 nm. Calibration standards of 1.00, 2.00, 3.00, 4.00, and 5.00 ppm are prepared by transferring appropriate amounts of a 10.0 ppm working solution of Fe2+ into separate 50-mL volumetric flasks, each of which contains 5 mL of thioglycolic acid, 2 mL of 20% w/v ammonium citrate, and 5 mL of 0.22 M NH3. After diluting to volume and mixing, the absorbances of the standards are measured. a)What is the effect on the reported concentration of iron in the sample if there is a trace impurity of Fe2+in the ammonium citrate?
The red color of soil is often due to the presence of iron. Metal ions are extracted from soil by stirring the soil in acid and then filtering the solution. One method for the analysis of Fe2+ is to form the highly colored Fe2+–thioglycolic acid complex. The complex absorbs strongly at 535 nm. Calibration standards of 1.00, 2.00, 3.00, 4.00, and 5.00 ppm are prepared by transferring appropriate amounts of a 10.0 ppm working solution of Fe2+ into separate 50-mL volumetric flasks, each of which contains 5 mL of thioglycolic acid, 2 mL of 20% w/v ammonium citrate, and 5 mL of 0.22 M NH3. After diluting to volume and mixing, the absorbances of the standards are measured. a)Use the data table below to prepare a calibration curve (absorbance versus concentration in ppm). Fit the data to straight line and find the equation for the straight line and the R2 value. (Hint: Think about what to do with the absorbance of the blank.)
Consider the solvatochromic complex, [Mo(bipy)(CO)4]. The complex has a MLCT peak in the UV-vis spectrum. This peak is at 533 nm in acetonitrile solvent and at 584 nm in benzene solvent. In a 50:50 acetonitrile:benzene mixture, the peak is at 559 nm. Is the mixture of acetonitrile and benzene immediately surrounding the [Mo(bipy)(CO)4] molecules less than, equal to, or greater than a 50:50 mixture (acetonitrile:benzene)? Justify your answer. (HINT: Do you need to convert the wavelengths to a more appropriate unit?)
Elimination of an L ligand (as the first step of a D substitution mechanism) from a charge - neutral NiL4 complex has very little tendency to occur for L = P(OMe3), but for L = PMe3, it occurs almost completely. Since the two ligand species have approximately the same cone angle, what factors are responsible for this difference?