chemistry

Zinc bis(dimethyldithiocarbamate)

Zinc bis(dimethyldithiocarbamate) 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 Zinc bis(dimethyldithiocarbamate) rather than just read about it. In short: Zinc dimethyldithiocarbamate is a coordination complex of zinc with dimethyldithiocarbamate. It is a pale yellow solid that is used as a fungicide, the sulfur vulcanization of rubber, and other industrial applications.

Key takeaways

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

Reference excerpt

Zinc dimethyldithiocarbamate is a coordination complex of zinc with dimethyldithiocarbamate. It is a pale yellow solid that is used as a fungicide, the sulfur vulcanization of rubber, and other industrial applications.

Applications Known as ziram in agriculture, it was introduced in the United States in 1960 as a broad-spectrum fungicide. It was used to address scab on apples and pears, leaf curl in peaches, and anthracnose and blight in tomatoes. In 1981, additional uses for ziram were approved, including the prevention of leaf blight and scab on almonds, shot-hole in apricots, brown rot and leaf spot in cherries, and scab and anthracnose in pecans. Ziram also began to be used on residential ornaments as a bird and mammal repellent. As a protectant fungicide, it is active on the plant's surface where it forms a chemical barrier between the plant and a fungus. A protectant fungicide is not absorbed into the plant and must be applied prior to infection. Ziram can either be directly sprayed on to a plant's leaf or it can be used as a soil and seed treatment. The top five crops ziram is used on are: almonds, peaches, nectarines, pears, and table and raisin grapes. Alternatively, ziram is used as an additive ingredient in industrial adhesives, caulking, and paint. It also serves as a bird and mammal repellent on outdoor ornamental items.

Chemistry The compound is a prototypical zinc dithiocarbamate, a broad class of coordination complexes with the formulae Zn(R2NCS2)2, where R can be varied. Such compounds are produced by treating zinc and dithiocarbamate (R2NCS2−), as illustrated with dimethyldithiocarbamate:

2 (CH3)2NCS2− + Zn2+ → Zn((CH3)2NCS2)2 Annually, approximately 1.9 million pounds of the active ziram ingredient are used. Ziram is often sold in powder or granule form. Zinc bis(diethyldithiocarbamate) complexes degrade thermally to give zinc sulfide.

Structure Compounds of the type Zn(S2CNR2)2 are dimeric, i.e. their proper formula is [Zn(S2CNR2)2]2. Each Zn center is in a distorted pentacoordinate site, with four Zn–S bonds of 2.3 Å length and one Zn–S interaction is over 2.8 Å in length. Mono-zinc derivatives are obtained by adding strong ligands (L) such as amines, which give adducts Zn(S2CNR2)2L.

Ecological effects The U.S. Environmental Protection Agency has concluded that ziram poses a low toxicity risk to mammals, a moderate risk to birds, and a high risk to aquatic species. After reviewing studies that investigated the effect of ziram on aquatic organisms, the Pesticide Action Network Pesticide Database concluded that its LC50 dose (amount of pesticide that is lethal to 50% of the test organisms within the stated study time) for amphibians places it in the "highly toxic" category.

See also Iron tris(dimethyldithiocarbamate) – a related complex, but with three dimethyldithiocarbamate ligands Nickel bis(dimethyldithiocarbamate) – a related complex, but where zinc has been replaced with nickel Zinc bis(diethyldithiocarbamate) – a closely related complex, but where methyl has been replaced with ethyl

References

External links https://pmep.cce.cornell.edu/profiles/extoxnet/pyrethrins-ziram/ziram-ext.html Zinc bis(dimethyldithiocarbamate) in the Pesticide Properties DataBase (PPDB)

Illustrations

Worked examples

Example 1 — a first encounter with Zinc bis(dimethyldithiocarbamate)

Start with the simplest possible case. Write down what Zinc bis(dimethyldithiocarbamate) 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 Zinc bis(dimethyldithiocarbamate) 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 Zinc bis(dimethyldithiocarbamate) 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 Zinc bis(dimethyldithiocarbamate)

In research: Zinc bis(dimethyldithiocarbamate) 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 Zinc bis(dimethyldithiocarbamate) 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: Zinc bis(dimethyldithiocarbamate) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aldehyde dehydrogenase inhibitors, Dithiocarbamates, Fungicides, so understanding it makes those chapters shorter.
In everyday life: Look for Zinc bis(dimethyldithiocarbamate) 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 Zinc bis(dimethyldithiocarbamate) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Zinc bis(dimethyldithiocarbamate) 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.
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Frequently asked questions

What is Zinc bis(dimethyldithiocarbamate) in simple terms?

Why does Zinc bis(dimethyldithiocarbamate) 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 Zinc bis(dimethyldithiocarbamate)?

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 Zinc bis(dimethyldithiocarbamate).