The Gmelin Institute presents the Third Supplement of the Gmelin Formula Index (GFI) which covers 95 new volumes of the Gmelin Handbook of Inorganic and Organometallic Chemistry published between 1988 and 1992. With this extension the GFI contains more than 400 000 elements, compounds, systems, and other types described in 620 volumes. The Third Supplement includes more than 65 000 compounds sorted according to the empirical formula and characterized by a linearized structural formula. As in previous sections of the index, compounds are further characterized by keywords if more information is available in the Handbook. Systems, mixed crystals, solutions, glasses, isotopes, isotopomers (also highly enriched), and other compound classes are separately listed. The GFI provides fast access to any inorganic or organometallic compound and the relevant page numbers in the Handbook. It is one of the means to facilitate searching for the large amount of available information on the chemical and physical properties of compounds. The Third Supplement will be published in 6 volumes.


The Gmelin Formula Index and the First and Second Supplement covered the volumes of the Eighth Edition of the Gmelin Handbook which appeared up to the end of 1987. This Third Supplement extends the Gmelin Formula Index and includes the compounds from the volumes until 1992. The publication of the Third Supplement enables to locate all compounds described in the Gmelin Handbook of Inorganic and Organometallic Chemistry since 1924. The basic structure of the Formula Index remains the same as the previous editions. Computer methods were employed during the preparation and the publication of the Third Supplement. Data acquisition, sorting, and data handling were performed using a suite of computer programs, developed originally by B. Roth, now at Chemplex GmbH. The SGML application for the final data processing for printing was developed in the com puter department of the Gmelin Institute and at Universitatsdruckerei H. Sturtz AG, Wurzburg. Frankfurt am Main, March 1994 U. Nohl, G. Olbrich Instructions for Users of the Formula Index First CoLumn (EmpiricaL FormuLa) The empirical formulae are arranged in alphabetical order of the element symbols and by increasing values of the subscripts. Any indefinite subscripts are placed at the end of the respective sorting section. Ions always appear after the neutral species, positive ions preceding negative ones.