Do high-quality 13C-NMR spectral data really come from journals with high Impact Factors?

Journals span a wide range of quality - one measure among others to express this difference in quality of journals within a certain field of science being their Impact Factors. The simple, but reasonable, expectation that high-quality C-13-NMR spectral data would have been published predominantly in high-IF journals needs revision after using a state-of-the-art prediction engine for chemical-shift values and correlating the values obtained with the published values on a per-journal basis. The situation seems to have become more stable during the 1990s as a long-term effect of the widespread application of two-dimensional techniques, which was reversed in the past few years by the immense pressure to publish high-IF work in a very competitive environment. (C) 2009 Elsevier Ltd. All rights reserved.