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• W4312345102 abstract "Since ancient alchemy, mankind has continued to explore the composition and principles of matter. By the early nineteenth century, many inorganic compounds and a few organic compounds were known to exist. Through the continuous exploration of the existed chemical substances, the chemical valence theory was gradually developed. In 1803, Dalton suggested that there was a simple integer ratio relationship when simple atoms combined to form complex atoms. For example, one atom A and one atom B will form an AB complex atom, and one atom A and two atoms B will form an AB2 complex atom; the total of atoms remains unchanged before and after the reaction. In 1839, after replacing three hydrogens in acetic acid with chlorines to produce a compound with similar properties, Dumas proposed a “theory of type”, dividing organic compounds into hydrogen-like, hydrogen-chloride-like and ammonia-like. In 1852, while studying metal–organic compounds, Frankland discovered that the affinity of atoms was always satisfied by the same number of bonding atoms, and thus introduced the concept of combining power. In 1857, Kekule put forward the concept of atomic affinity, arguing that when atoms of an element combined with atoms of another element the total number of atoms was determined by basicity numbers or affinity numbers of the constituent atoms. The following year, Kekule wrote in a renowned work On the Constitution and Metamorphoses of Chemical Compounds and on the Chemical Nature of Carbon that one carbon atom could at most bond to four hydrogen atoms in a compound, which has laid a foundation for valence theory. In 1865, Hofmann presented the most initial concept of chemical valence: “quantivalence” in Introduction to Modern Chemistry, the idea that elements had different quantitative values of 1, 2, 3, etc. In 1867, Kekule adopted the word “valenz”, which was widely recognized and applied in European countries. It is called valence in modern academic literature." @default.
• W4312345102 created "2023-01-04" @default.
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• W4312345102 date "2022-01-01" @default.
• W4312345102 modified "2023-09-28" @default.
• W4312345102 title "Theory of Coordination Chemistry" @default.
• W4312345102 doi "https://doi.org/10.1007/978-981-19-2711-9_1" @default.
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