science

Transition metal dithiophosphate complex

Transition metal dithiophosphate complex is a science 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 Transition metal dithiophosphate complex rather than just read about it. In short: Transition metal dithiophosphate complexes are coordination compounds containing dithiophosphate ligands, i.e. ligands of the formula (RO)2PS−2. The charge-neutral complexes tend to be soluble in organic solvents, especially when R is branched.

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Reference excerpt

Transition metal dithiophosphate complexes are coordination compounds containing dithiophosphate ligands, i.e. ligands of the formula (RO)2PS−2. The charge-neutral complexes tend to be soluble in organic solvents, especially when R is branched. Dithiophosphates are available with a wide variety of alkoxy groups. The range of complexes is similar to those for dithiocarbamate complexes.

Preparation Dithiophosphate ligands are prepared by alcoholysis of phosphorus pentasulfide:

P4S10 + 8 C2H5OH → 4 (C2H5O)2PS2H + 2 H2S Dialkoxydithiophoric acids react with many metal oxides, chlorides, and acetates:

3 (C2H5O)2PS2H + CrCl3(H2O)6 → Cr[S2P(OC2H5)2]3 + 3 HCl + 6 H2O Alternatively, salts, such as ammonium diethyldithiophosphate, can be used to prepare complexes by salt metathesis reactions:

2 NH4[S2P(OC2H5)2] + NiCl2·(H2O)6 → Ni(S2P(OC2H5)2) + 6 H2O + 2 NH4Cl 3 NH4[S2P(OCH3)2] + MoCl3(thf)3 → Mo[S2P(OCH3)2]3 + 3 NH4Cl + 3 thf (thf = tetrahydrofuran) Oxidation of dithiophosphoric acid gives the disulfide. Dithiophosphate complexes have also be prepared by oxidative addition of these disulfides:

[S2P(OC2H5)2]2 + Ni(P(OC6H5)3)4 → Ni(S2P(OC2H5)2)2 + 4 P(OC6H5)3

Ligand properties Dithiophosphates, when bidentate, are classified as L-X ligands in the Covalent bond classification method. In the usual electron counting method, they are three-electron ligands. With respect to HSAB theory, dithiophosphates are classified as soft ligands. In addition to the conventional representation, they are also described by a zwitterionic resonance structure (RO)2P+(S−)2. Phosphorus is tetrahedral.

Selected homoleptic complexes

Homoleptic complexes have formulas M[S2P(OR)2]4, M[S2P(OR)2]3, and M[S2P(OR)2]2.

Zr[S2P(OC3H7)2]4 V[S2P(OC2H5)2]3, red-brown, Cr[S2P(OC2H5)2]3, violet Mo[S2P(OCH3)2]3, red Fe[S2P(OC3H7)2]3 Ru[S2P(OC2H5)2]3 pink, paramagnetic Ir[S2P(OC3H7)2]3 Ni[S2P(OC6H11)2]2 violet Pd[S2P(OC2H5)2]2 Pt[S2P(OC2H5)2]2 yellow, diamagnetic Cu[S2P(OC6H4CH3)2]2 poly-Zn[S2P(OC2H5)2]2 These complexes are almost always solids at room temperature.

Applications Zinc dialkyldithiophosphates are components of oil additives. Dithiophosphate complexes are also implicated as intermediates in froth flotation, e.g. for the purification of copper from slag.

References

Illustrations

Worked examples

Example 1 — a first encounter with Transition metal dithiophosphate complex

Start with the simplest possible case. Write down what Transition metal dithiophosphate complex claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Transition metal dithiophosphate complex 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 Transition metal dithiophosphate complex 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 Transition metal dithiophosphate complex

In research: Transition metal dithiophosphate complex appears in science 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 Transition metal dithiophosphate complex 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: Transition metal dithiophosphate complex is common in secondary-school and first-year university syllabi. It links to neighbouring topics Phosphorothioates, so understanding it makes those chapters shorter.
In everyday life: Look for Transition metal dithiophosphate complex 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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Frequently asked questions

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