Title
The Nature of the Hydrogen Bond: Outline of a Comprehensive Hydrogen Bond Theory (International Union of Crystallography Monogra,Used
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Hydrogen bond (Hbond) effects are known: it makes sea water liquid, joins cellulose microfibrils in trees, shapes DNA into genes and polypeptide chains into wool, hair, muscles or enzymes. Its true nature is less known and we may still wonder why OH...O bond energies range from less than 1 to more than 30 kcal/mol without apparent reason. This Hbond puzzle is reexamined here from its very beginning on the ground of an inclusive compilation of experimental Hbond energies and geometries.New concepts emerge from this analysis: new classes of systematically strong Hbonds (CAHBs and RAHBs: charge and resonanceassisted Hbonds); full Hbond classification in six classes (the six chemical leitmotifs); and assessment of the covalent nature of strong Hbonds. This leads to three distinct but interconsistent models able to rationalize the Hbond and predict its strength, based on classical VB theory, matching of donoracceptor acidbase parameters (PA or pKa), or shape of the Hbond protontransfer pathway.Applications survey a number of systems where strong Hbonds play an important functional role, namely drugreceptor binding, enzymatic catalysis, iontransport through cell membranes, crystal design and molecular mechanisms of functional materials.
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Shipping & Returns
Shipping
We ship your order within 2–3 business days for USA deliveries and 5–8 business days for international shipments. Once your package has been dispatched from our warehouse, you'll receive an email confirmation with a tracking number, allowing you to track the status of your delivery.
Returns
To facilitate a smooth return process, a Return Authorization (RA) Number is required for all returns. Returns without a valid RA number will be declined and may incur additional fees. You can request an RA number within 15 days of the original delivery date. For more details, please refer to our Return & Refund Policy page.
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Warranty
We provide a 2-year limited warranty, from the date of purchase for all our products.
If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.
This warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
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Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
We accept payments with :
Visa, MasterCard, American Express, Paypal, Shopify Payments, Shop Pay and more.