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Special Issue "NQR of Polymorphic Crystals"
Deadline for manuscript submissions: 31 October 2019.
The phenomenon of polymorphism is well known to profoundly effect the solid-state properties of crystalline solids. For example, the polymorphic forms of solid active pharmaceutical ingredients (API) often manifest striking differences in solubility and dissolution rate, which directly affect the biological action of drugs. From an economic standpoint, the production and intellectual property protection aspects of polymorphism may be equally important.
Nuclear quadrupole resonance (NQR) spectroscopy is sometimes considered an 'exotic' variant of NMR and is not used as widely as NMR. However, it is becoming more and more clear that especially in the field of crystalline polymorphism, there are advantages of NQR spectroscopy that can help solve many questions more easily than NMR. For example, NQR does not require an external magnetic field, so powder samples exhibit the same high spectral resolution with narrow lines as single crystals. Different polymorphic structures often exhibit minuscule shifts or splitting of NMR lines; in NQR, the resonance frequencies are directly defined by the crystalline structure and the shifts are much more pronounced and easily distinguished. The usefulness of NQR is nowadays further enhanced by DFT calculations that allow for the calculation of the electric field gradient, thus establishing a link between the structural arrangement and the corresponding NQR spectra.
This Special Issue, entitled “NQR of Polymorphic Crystals”, aims to collect original research papers and review articles on NQR studies on polymorphic crystals, not just in the sense of different crystalline forms of the same molecules, but also other related solid state forms, such as co-crystals, solvates, salts and amorphous forms.
Dr. Tomaž Apih
Manuscript Submission Information
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.
Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.
- Nuclear Quadrupole Resonance
- Electric Field Gradient