@article {2526, title = {Evolutionary algorithms to solve complicated NMR spectra}, journal = {Journal of Chemical Physics}, volume = {130}, number = {4}, year = {2009}, note = {ISI Document Delivery No.: 401TJTimes Cited: 3Cited Reference Count: 37Meerts, W. Leo de Lange, C. A. Weber, A. C. J. Burnell, E. E.}, month = {Jan}, pages = {8}, type = {Article}, abstract = {The complexity of H-1 NMR spectra of solutes in partially ordered solvents such as liquid crystals increases rapidly with the number of spins. Spectra of simple solutes with sufficient symmetry and containing not too many spins (typically <= 8) are readily analyzed. The analysis of larger spin systems is more difficult, and often impossible. In this paper we present the application of a general automated evolutionary algorithm to solve the highly complex proton NMR spectrum of the 12-spin system pentane, a solute that interconverts rapidly among several symmetry-unrelated conformations. The interpretation of the spectral parameters that are obtained from the analysis requires the use of a model to connect relative orientational orders in symmetry-unrelated conformers.}, keywords = {ALKYL CHAINS, AUTOMATED-ANALYSIS, evolutionary computation, HIGH-RESOLUTION NMR, liquid crystals, magnetic resonance, MOLECULAR-STRUCTURE, MULTIPLE-QUANTUM SPECTRA, NEMATIC LIQUID-CRYSTALS, ORDER, organic compounds, PROTON, SHAPE, SOLUTES, spectroscopy computing, STRATEGY}, isbn = {0021-9606}, url = {://000262965000028}, author = {Meerts, W. L. and de Lange, C. A. and Weber, A. C. J. and Burnell, E. E.} } @article {2714, title = {ZERO ELECTRIC-FIELD GRADIENT MIXTURES FOR THE ELUCIDATION OF ORIENTATIONAL MECHANISMS}, journal = {Liquid Crystals}, volume = {13}, number = {3}, year = {1993}, note = {ISI Document Delivery No.: KX191Times Cited: 22Cited Reference Count: 28}, month = {Mar}, pages = {319-343}, type = {Article}, abstract = {A novel zero electric field gradient nematic liquid crystal made up from two nematic liquid crystal components is employed as a solvent for a series of molecules ranging from small molecules to mesogens themselves. Nuclear magnetic resonance is used to determine the degree of order of the solute and solvent molecules. Results are compared to those obtained for two completely different zero electric field gradient nematic mixtures. The comparison strongly indicates that for a variety of molecules largely differing in size, shape and flexibility their degree of order can be described by a single orientation mechanism. This mechanism can be adequately modelled by a simple phenomenological mean field model based on the size and shape anisotropy of the dissolved species. The use of zero electric field gradient mixtures in combination with this mean field model allows the prediction of solute order parameters at approximately the 10 per cent level.}, keywords = {ANISOTROPIC ENVIRONMENTS, METHANES, MOLECULES, NEMATIC LIQUID-CRYSTALS, NMR, ORDER, SIZE, SOLUTES, SOLVENTS}, isbn = {0267-8292}, url = {://A1993KX19100001}, author = {Barnhoorn, J. B. S. and de Lange, C. A. and Burnell, E. E.} }