chemistry

Nenad Trinajstić

Nenad Trinajstić 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 Nenad Trinajstić rather than just read about it. In short: Nenad Trinajstić (26 October 1936 – 27 August 2021) was a Croatian chemist and one of pioneers of the chemical graph theory. Life and work Trinajstić was born in Zagreb.

Key takeaways

Nenad Trinajstić belongs to chemistry; place it in that map before memorising details.
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Reference excerpt

Nenad Trinajstić (26 October 1936 – 27 August 2021) was a Croatian chemist and one of pioneers of the chemical graph theory.

Life and work Trinajstić was born in Zagreb. He received M.Sc. and D.Sc. degrees from the University of Zagreb based on work done at the University of Sheffield under John Murrell. His doctoral advisor was Milan Randić. From 1968 to 1970 he was a Postdoctoral fellow under Michael J. S. Dewar at the University of Texas, Austin with whom he has published 16 papers. He worked at Pliva and Ruđer Bošković Institute eventually becoming a full research professor in 1977 and from 2001 professor emeritus at the University of Zagreb. His scientific interests are quantum chemistry, mathematical chemistry, chemoinformatics, history of chemistry and philosophy of natural science. He wrote the first monograph on chemical graph theory and introduced several molecular descriptors such as 3-dimensional Wiener index and Zagreb indices (with Ivan Gutman), which are among the more studied topological indices. Independently of Jun-ichi Aihara, he introduced topological resonance energy as a reliable theory of aromaticity. In quantum chemistry he worked on semi-empirical molecular orbital theory and settling conjugated-circuit model on a firm quantum-mechanical basis. Trinajstić has published more than 500 scientific papers, about 150 technical papers and 12 books. He was a full member of Croatian Academy of Arts and Sciences, a member of International Academy of Mathematical Chemistry and was awarded the Mid–America State Universities Association Distinguished Foreign Scholar Award in 1986 and Croatian National Science Award in 2003. Trinajstić died on 27 August 2021 at the age of 85.

References

Selected publications A. Graovac; I. Gutman; N. Trinajstić; T. Živković (1972). "Graph theory and molecular orbitals: Application of Sachs theorem". Theor. Chim. Acta. 26 (1): 67–78. doi:10.1007/bf00527654. S2CID 101611868. I. Gutman; N. Trinajstić (1972). "Graph theory and molecular orbitals. Total φ-electron energy of alternant hydrocarbons". Chemical Physics Letters. 17 (4): 535–538. Bibcode:1972CPL....17..535G. doi:10.1016/0009-2614(72)85099-1. I. Gutman; M. Milun; N. Trinajstić (1975). "Topological Definition of Resonance Energy". MATCH – Commun. Math. Computer Chem. 1: 171–175. I. Gutman; B. Ruscic; N. Trinajstić; C.F. Wilcox Jr. (1975). "Graph theory and molecular orbitals. XII. Acyclic polyenes". J. Chem. Phys. 62 (9): 1692–1704. Bibcode:1975JChPh..62.3399G. doi:10.1063/1.430994. D. Bonchev; N. Trinajstić (1977). "Information theory, distance matrix, and molecular branching" (PDF). J. Chem. Phys. 67 (10): 4517. Bibcode:1977JChPh..67.4517B. doi:10.1063/1.434593. hdl:10338.dmlcz/104047. I. Gutman; M. Milun; N. Trinajstić (1977). "Graph Theory and Molecular Orbitals. XIX. Non–Parametric Resonance Energies of Arbitrary Conjugated Systems". J. Am. Chem. Soc. 99 (6): 1692–1704. doi:10.1021/ja00448a002. D. Bonchev; O. V. Mekenyan; N. Trinajstić (1981). "Isomer discrimination by topological information approach". J. Comput. Chem. 2 (2): 127–148. doi:10.1002/jcc.540020202. S2CID 120705298. N. Trinajstic. Chemical Graph Theory. Vols. 1,2. CRC Press: Boca Raton, Florida, 1983; 2nd Ed. 1992. Z. Mihalić; N. Trinajstić (1992). "A graph-theoretical approach to structure-property relationships". J. Chem. Educ. 69 (9): 701. Bibcode:1992JChEd..69..701M. doi:10.1021/ed069p701. D. Plavšić; S. Nikolić; N. Trinajstić; Zlatko Mihalić (1993). "On the Harary index for the characterization of chemical graphs". Journal of Mathematical Chemistry. 12 (1): 235–250. doi:10.1007/BF01164638. S2CID 123346852. D. Amić; D. Davidović-Amić; D. Bešlo; N. Trinajstić (2003). "Structure-Radical Scavenging Activity Relationships of Flavonoids". Croatica Chemica Acta. 76 (1): 55–61.

Worked examples

Example 1 — a first encounter with Nenad Trinajstić

Start with the simplest possible case. Write down what Nenad Trinajstić 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 Nenad Trinajstić 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 Nenad Trinajstić 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 Nenad Trinajstić

In research: Nenad Trinajstić 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 Nenad Trinajstić 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: Nenad Trinajstić is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1936 births, 2021 deaths, Croatian chemists, so understanding it makes those chapters shorter.
In everyday life: Look for Nenad Trinajstić 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 Nenad Trinajstić in 20 minutes

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Frequently asked questions

What is Nenad Trinajstić in simple terms?

Nenad Trinajstić (26 October 1936 – 27 August 2021) was a Croatian chemist and one of pioneers of the chemical graph theory. Life and work Trinajstić was born in Zagreb.

Why does Nenad Trinajstić 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 Nenad Trinajstić?

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 Nenad Trinajstić.