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Alfred Stock and the Renaissance of Inorganic Chemistry

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Alfred Stock and the Renaissance of Inorganic Chemistry Pure & Appl. CI-jeni., Vol. 49, pp. 691 —700.Pergarnon Press, 1977. Printed in Great Britain. ALFRED STOCK AND THE RENAISSANCE OF INORGANIC CHEMISTRY Egon Wiberg Translation from the German by H. Nöth and R.H. Walter Institut für Anorganische Chemie der Universität München, MeiserstraIe 1, 8000 MUnchen 2, West Germany When, a hundred years ago on the 16th July 1876, a 'Sunday child', baptised Alfred, was born to the Danzig insurance official Hugo Stock and his wife Hildegard, a heart began to beat whichwas destined, in the course of its 70 years' existence, to live through all the heights and depths of its earth— ly fate. A human being entered life, whose extraordinary research and organi- sational ability swiftly raised him to scientific fame and international re— cognition. His physical strength was increasingly consumed in the service of chemistry until he closed his eyes for the last time on the 12th August 1946 in a small town on the river Elbe, at the end of a life full of successes and honours, extensively paralysed after indescribable suffering from the hard— ships of refuge during the aftermath of the last war and the loss of his very last possessions, in the simplest of surroundings, quiet and unrecognised in the confusion of the postwar period. Let us follow the changing fate on his long road from the unhindered start to the bitter end, a life which bridged the wide span of periods of German history from the 'Kaiserreich' through the 'Weimarer Republik', the 'Drittes Reich' to post—war Germany, and whose course saw the introduction of signif i— cant developments in inorganic chemistry. But it was Alfred Stock and his congenial contemporary Otto Ruff who, by their modern working methods and successful achievements, rescued Inorganic Chemistry —which,after the great discoveries of the .18th and the beginning of the 19th century, gradually became more and more insignificant and, at the turn of the century, was living a Cinderella's existence beside its two more attractive sisters, Organic Chemistry, already in full bloom, and Physical Chemistry., which was just beginning to flower —fromthe rale of the serving maid and raised it to the ranks of equal status. Alfred Stock spent his school years in Berlin, to where his parents moved two years after his birth. At that time he was already beginning to love this active, lively and gay town, in which he spent a total of nearly five decade of his life. It is surely no coincidence that he started his 'Lehrjahre' (Student years) (Berlin, Paris), 'Gesellenjahre' (early research period) (Berlin, Breslau), 'Meisterjahre' (years as Professor) (Berlin, Karlsruhe) and 'Ruhejahre' (retirement) (Berlin, Warmbrunn), each time from this same city, always returning and beginning again at a higher, more mature and more enlightened stage of his life. 'Lehrjahre' Berlin (1878—1899). That Alfred Stock was to dedicate himself to the natural sciences, in particular to chemistry, was evident to him right from his schooldays. And thus it was as an 18—year old student, that he was registered in 1894 at the University of Berlin, where he devoted himself to eight semesters of chemistry in the chemical institute led for two years by Emil Fischer. His thesis, finished four years later, was concerned with problems an organic chemistry. At the solemn PhD examination in May 1899, the 23—year old Stock successfully defended his. thesis in front of three opponents, among them his five—year senior Otto Ruff, the same Otto Ruff who, as a congenial inorganic chemist, later dared to make the following witty comment at the height of his own scientific fame:"I know only two important German inorganic chemists —theother is Alfred Stock!" As Fischer's former institute had long been inadequate with regard to the increasing demands of education in chemistry, Fischer was promised for the occasion of his move to Berlin a new chemistry building, for which the plans had already been started and which was due to be moved into by 1900. It was 691 692 EGON WIBERG then that Fischer intended togive greater emphasis to the unfairly neglected subject of inorganic chemistry. He therefore sent two of his teaching assistants to outside laboratories to learn modern inorganic experimental methods prior to the completion of the new building. It is a tribute to Emil Fischer's scientific far—sightedness and perspicacity that his choice fell on Alfred Stock and Otto Ruff whose achievements were later to pioneer the new golden age of inorganic chemistry in Germany. Stock went to HenrI Moissan in Paris and L:toWilhelm Ostwald in Leipzig. Paris (1899—1900). The then 47—year oldHenri Moissan, at the zenith of his career, was professor at the school of pharmacy where, as an inorganic chemist, he had held the chair in —toxicologyfor 13 years, and was appointed professor of inorganic chemistry shortly before Stock's arrival. It was a happy group of people that Stock joined in Moissan's laboratory. America, England, Austria, Norway, Germany, France and Russia were —insome cases multiply —represented,all wanting to learn his techniques, in particular the use of his 'four ictrique'. But the possibility did not exist at the Ecole de Pharmacie itself of operating such an electric furnace due to in— adequate power installations. If one wanted to 'faire du four', one had to go on a 3/4 hour romantic coach drive through Paris, with all the necessary equipment in several vehicles, to the distant power station belonging to the electricity company, in order to be able to run the oven. As a second re- presentative of Germany, Stock was then able to welcome into Moissan's group the recently graduated Dr.Franz Fischer, later to become co—inventor of the Fischer—Tropsch Synthesis. With the stature of a guardsman, at 1,93 m tall, the French found Fischer very striking and Alfred Stock, 1/4 m shorter, was unfortunately no match for him. His training with Moissan had a decisive. influence on Stock's later career. Moissan gave him the task of synthesising boron—silicon compounds, Stock's first contact with these two elements which were later to become his dominant professional interest. He became acquainted with the mercury bath (for collec— ting gases), containing vast quantities of mercury, which he used in his future research and which constituted the source of his eventual mercury poisoning. His association with the numerous professional colleagues in Moissan's research group contributed Cignificantly to his future negociating skills at German and international meetings. Moissan's great concern for orderliness, his wealth of ideas for developing laboratory apparatus and his exceptional oratory gifts aroused and strengthened comparable talents in Stock. In particular, Moissan's principal lectures on inorganic chemistry gave him great aesthetic enjoyment by virtue of their clarity and the elegant often humorous and rhetorically sparkling presentation. An equal ability was thus inspired in Stock, whose lectures and speeches similarly distinguished themselves by a masterful, subtle and elegant command of speech, by lucid exposition of the material and by a sense of humour appropriate to all situations, quick—witted and, if the need arose, also sarcastic. After enjoying the splendid Jubilee World Exhibition in Paris in 1900, Alfred Stock returned to Berlin enriched with lasting impressions and experiences and half a dozen publications and became teaching assistant in Fischer's institute, which had just moved into the recently completed new building. 'Gesellenjahre' Berlin (1900—1909). The move from the romantic, lively, cosmopolitan Parisian atmosphere and the pastoral, idyllically situated laboratory of Moissan to the new, basic and simple home of the Berlin University chemistry faculty, which was situated amongst large blocks of houses in a lonely corner of the city and, according to Emil Fischer's wishes, devoid of any architectural inspiration, posed initial difficulties for the 24—year old assistant. In Paris everything was poetry: the environment, the, city, the people; in Berlin everything was plain. But he soonbecame involved. again in his scientific work, and there followed a hectic nine—year period producing over 60 worthy publications on various problems and characterised by a search for his own research field, without the desired breakthrough which was only to follow later in Breslau with his eventual decision to work on the chemistry of boron . and silicon hydrides. Thegreater part of the work carried out during the Berlin years was concerned with the elements phosphorus, arsenic and antimony and gave him a thorough knowledge of their many allotropes and their compounds with hydrogen, sulphur and nitrogen. Further experiments of that period involved reactions of boron bromide and boron ,sulphide. The numerous publications on improvements to Alfred Stock and the renaissance of inorganic chemistry 693 aaratus contain a wealth of suggestions, which proved for the most part to be very valid ideas, and which Were developed in the time to come into 'Stock's High Vacuum Technique', proving of use to many researchers in their 'experimental work. Despite these many varied and time—consuming experimental commitments, the 30— year old"Privatdozent' still found time to write a 152—paged book 'Praktikum der guantitàtiyen anoranischen Analyse', which survived many editions, was translated into numerous languages and, since Stock's death, has been repro— duced in extended form by Hermann Lux, one of his coworkers. 'So,in the nine years in Berlin, Stock changed those memorable words of Plinius "multum, non multa" with yOuthful exuberance into "multum et multa". In 1904, at the age of 28, he became a 'Dozent' together with his contemporary colleague Otto Diels, later a Nobel prize laureate; in 1906 he was appointed headof his researchgroup and professor in succession to Otto Ruff, who ' moved to Danzig.
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