Classify the following ligands as monodentate, bidentate, tri-dentate, or tetradentate. Which can form chelate rings?

(a)  

(b) 

(c) 

(d) 

Video transcript

All right. Hi, everyone. So this question is asking us is the given ligand mono dentate. If not, what is, is what is its dentist? Is it capable of forming chelate rings? Option A says the ligand is mono dentate but not capable of forming chelate rings. Option B says the ligand is bent and capable of forming chelate rings. Option C says the ligand is Trent but not capable of forming chelate rings. And option D says the ligand is tetra dentate and capable of forming chelate rings. So with respect to the density of a given atom, recall that we can distinguish between those that are mono dentate, right? And those that are poly dentate. Now mono dentate ligands are capable of bonding using one electron pair from one single donor at up. Now poly dentate Liggins can bond through multiple electron pairs on more than one donor atom. So within the umbrella of the poly dentate ligands are a few different specifications, right? Because we can specify or differentiate between those that are bent, try dentate and even ted trente. So essentially each prefix here specifies the number of donor atoms present in that ligand. So bent eight indicates two donor atoms, Trent eight indicates three and so on. Now, if we can consider for a second, whether or not a ligand is capable of forming kate rings recall that that's possible only when the ligand in question is poly dentate. So if a legion happens to be poly dentate, and also as long as the binding sites are close enough together for them to actually create a ring structure, then it can in fact form chelate rings. So let's consider the structure given in the question because it just so happens that we have a structure that has four nitrogen atoms. Now nitrogen being a hetero atom or rather a relatively electron atom, it does in fact have lone pairs of electrons which means that each nitrogen atom that we see could potentially be a donor atom or binding. So because we have four of those, it is poly dentate and specifically it is tetra dentate. So not only is it poly dentate, specifically tetra dentate or nitrogen atoms are relatively close together, right? Because notice how there are only two carbons in between are nitrogens here. So therefore, they could actually form a ring structure. So our answer here is going to be option d in the multiple choice, right? Because the ligand is tetrad Nate and capable of forming kate rinks because our nitrogen atoms which are donor atoms are in fact close enough together for a ring structure to form. So with that being said, thank you so very much for watching. And I hope you found this helpful.