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Coordination compund formula & compound name
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- When Alfred Werner was developing the field of coordinationchemistry, it was argued by some that the opticalactivity he observed in the chiral complexes he hadprepared was due to the presence of carbon atoms in themolecule. To disprove this argument, Werner synthesizeda chiral complex of cobalt that had no carbon atoms in it,and he was able to resolve it into its enantiomers. Design acobalt(III) complex that would be chiral if it could be synthesizedand that contains no carbon atoms. (It may not bepossible to synthesize the complex you design, but we willnot worry about that for now.)Scott test is one of the methods used for screening for Cocaine in Forensic Chemistry. The multi step method consists of a) reacting the sample drug with cobaltous thiocyanate b) dissolving of the formed precipitate by adding HCl and c) extraction of coordination compound with Chloroform d) measurement of absorbance of extracted coordination compound at 627 nm All the reactions in this multistep method are not fully understood. However, it was determined that there are 2 moles of cocaine in coordination compound measured in last step. If coordination compound is represented as “Scott” coordination compound, which of the following is correct “stoichiometric” factor to get mass of cocaine from mass of measured complex ? a.g (Scott coordination cpd) * MM (Scott coordination cpd) MM (cocaine) b.g (Scott coordination cpd) * 2 *MM (Scott coordination cpd) MM…Consider the [Ir2(dimen)4] 2+ complex. Notice that the dimen ligand is asymmetric. There is also a different, symmetric diisocyano ligand referred to as “TM4” (structure shown to the right) that forms the same sort of binuclear complex that dimen does. Answer the following questions with supporting justification: a. How many geometric isomers (ignore any optical ones) of [Ir2(TM4)4] 2+ are there? b. How many geometric isomers (ignore any optical ones) of [Ir2(dimen)4] 2+ are there? c. In the “twisted” deformational isomer, would you expect [Ir2(TM4)4] 2+ or[Ir2(dimen)4] 2+ to be able to rotate polarized light? Justify your answer.
- Fill in the blanks : (i) When a ligand has a two-complexing or donor group in its structure, it is said to be————— (ii) ___________are compounds whose colour changes when they bind to a metal ion. (ii) If you double the wavelength, you will observe. ________the energy. (iv) In_____________ titration, we monitor changes in absorbance during the titration to find out the equivalence point. (v) Two liquids are_____________ if they form a single phase when they are mixed in any ratio. (vi) The efficiency of Chromatographic Columns can be described by____________Equation.In addition to the three examples of coordination compounds mentioned in this experiment (heme, chlorophyll, Prussian blue), use a scientific encyclopedia or online reference to find three other examples of important coordination compounds. Give their formulas and uses.Dimethyldithiocarbamate (abbreviated as dmdtc) is an anionic bidentate ligand with a chemical formula (S2CNMe2)- - where Me stands for methyl group (-CH3). In the photo above, this ligand coordinates to a metal through its 2 sulfur atoms (where M represents a metal). When three dmdtc ligands bind to a ferric ion (Fe3+), a stable coordination complex called ferbam is formed. Given this information, answer / identify the following. complex geometry hybridization type of the central atom coordination number
- Dimethyldithiocarbamate (abbreviated as dmdtc) is an anionic bidentate ligand with a chemical formula (S2CNMe2)- - where Me stands for methyl group (-CH3). In the photo above, this ligand coordinates to a metal through its 2 sulfur atoms (where M represents a metal). When three dmdtc ligands bind to a ferric ion (Fe3+), a stable coordination complex called ferbam is formed. Given this information, answer / identify the following. total number of d electrons number of unpaired d electrons type of magnetism (paramagnetic or diamagnetic)Draw the metal coordination structure of carbonic anhydrase enzyme. Clearly show the 3-Dgeometry round the metal center. *Hi, I am actually confused on what a 3-D geometry of this structure should look like and would like some clarification, Thank You in advance!Draw the molecular structure of the iron-phenanthroline complex using an appropriate software (i.e. ChemSketch)
- 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.)Which statement is true regarding interligand charge-transfer (ICT or LL'CT) complexes? Group of answer choices In an ICT transition, an electron is promoted from a pi-acceptor ligand orbital to one on a pi-donor ligand ICT transitions are only observed for complexes that have tetrahedral geometries The metal center plays the most influential role an ICT transition For a given complex, the ICT molar absorptivity is at its maximum when the pi-donor and pi-acceptor ligands are co-planar
