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Average increase in chain length of crystalline long chain compounds per carbon atom
Author(s) -
Skau Evald L.
Publication year - 1973
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02641794
Subject(s) - homologous series , carbon chain , chain (unit) , atom (system on chip) , tilt (camera) , chemistry , crystallography , carbon fibers , carbon atom , potassium , crystal structure , molecule , series (stratigraphy) , crystal (programming language) , value (mathematics) , organic chemistry , materials science , mathematics , geometry , ring (chemistry) , physics , astronomy , composite number , computer science , embedded system , programming language , composite material , paleontology , statistics , biology
A comprehensive survey has been made of published crystal X‐ray diffraction data in order to select an authentic overall value for d 90 , the average increase in chain length of crystalline long chain compounds per carbon atom, for general use in calculating angle of tilt. Data were available for 10 isomorphous homologous series including the normal hydrocarbons, alkanoic acids, primary alcohols, ketones, dicarboxylic acids, symmetrical saturated triglycerides, potassium acid salts, quarter‐hydrates of Na‐1‐alkanesulfonates, hydrazides and the dihydrazides of dicarboxylic acids. The results, supported by data for other specific long chain derivatives show that (a) 1.27 Å is the best value for this constant, and (b) there is no justification for the value 1.30 Å, which has been used in the recent literature as the accepted value in estimating the angle of tilt. The information developed can be used to predict the effective length of one molecule in the crystal of any specific long chain member of any of the homologous series studied.