chemistry

Tris(glycinato)cobalt(III)

Tris(glycinato)cobalt(III) is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tris(glycinato)cobalt(III) rather than just read about it. In short: Tris(glycinato)cobalt(III) describes coordination complexes with the formula Co(H2NCH2CO2)3. Several isomers exist of these octahedral complexes formed between low-spin d6 Co(III) and the conjugate base of the amino acid glycine.

Key takeaways

Tris(glycinato)cobalt(III) belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tris(glycinato)cobalt(III) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tris(glycinato)cobalt(III) from memory before moving on to harder problems.

Reference excerpt

Tris(glycinato)cobalt(III) describes coordination complexes with the formula Co(H2NCH2CO2)3. Several isomers exist of these octahedral complexes formed between low-spin d6 Co(III) and the conjugate base of the amino acid glycine.

Structures

Both a meridional isomer and a facial isomer are known. In the former the Co-O bonds share a plane, and in the facial isomer they do not. Each of these two isomers exists also as pairs of stereoisomers, termed Δ and Λ. This set of compounds are prototypes of many tris(aminocarboxylate) complexes, with the notable distinction that the Co(III) derivatives do not isomerize readily and can thus be separated. The violet isomer is obtained anhydrous, whereas the red derivative is the monohydrate. X-ray crystallographic characterization of the mer isomer demonstrates the existence of a dihydrate, however.

Synthesis The reaction of glycine with sodium tris(carbonato)cobalt(III) produces both the violet meridional and red-pink facial isomers in approximately equal amounts. The compounds are separated by fractional crystallization. These complexes have been characterized by X-ray crystallography. The isomeric forms of tris(glycinato)cobalt(III) are poorly soluble in water. The solubility increases considerably in acidic solution.

Other cobalt glycinates Aside from the isomers of tris(glycinato)cobalt(III), several other cobalt(III) bis(glycinate) complexes are known. Some have the formula [Co(gly)2L2]+ (L2 = bipy and ethylenediamine) and [Co(gly)2(NO2)2]−. The cobalt(II) derivative Co(gly)2(H2O) has also been characterized.

References

Illustrations

Worked examples

Example 1 — a first encounter with Tris(glycinato)cobalt(III)

Start with the simplest possible case. Write down what Tris(glycinato)cobalt(III) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tris(glycinato)cobalt(III) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tris(glycinato)cobalt(III) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tris(glycinato)cobalt(III)

In research: Tris(glycinato)cobalt(III) appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tris(glycinato)cobalt(III) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tris(glycinato)cobalt(III) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cobalt(III) compounds, Cobalt complexes, Glycinates, so understanding it makes those chapters shorter.
In everyday life: Look for Tris(glycinato)cobalt(III) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Tris(glycinato)cobalt(III) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tris(glycinato)cobalt(III) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Tris(glycinato)cobalt(III) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tris(glycinato)cobalt(III) in simple terms?

Why does Tris(glycinato)cobalt(III) matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tris(glycinato)cobalt(III)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tris(glycinato)cobalt(III).