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An electrically neutral entity consisting of more than one atom (n > 1). Rigorously, a molecule, in which n > 1 must correspond to a depression on the potential energy surface that is deep enough to confine at least one vibrational state. This tag should be applied to question about certain molecules or a class of them.

7
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There are quite some molecules that are persistent (= live long enough in solution to allow for a spectroscopical characterization, but cannot be isolated) or even stable (= can be isolated, bottled …
answered Feb 19 '14 by Klaus-Dieter Warzecha
3
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= \log_{10}{\left(\frac{I_0}{I} \right)} = \epsilon_\lambda\cdot c \cdot d \] A higher concentration of S will result in higher absorbance. Now imagine that the light-absorbing molecules S are linked …
answered Mar 15 '16 by Klaus-Dieter Warzecha
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Water with its fluctuating hydrogen bond networks is a special case. If you feel for it, have a look at Water clusters: Untangling the mysteries of the liquid, one molecule at a time, but it doesn't a …
answered May 7 '15 by Klaus-Dieter Warzecha
3
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Most people seems to think that hydrogen bonds are limited to $\ce{X-H\bond{~}Y}$ interactions, where $\ce{X}$ and $\ce{Y}$ are heteroatoms. In the crystal, a $\ce{C-H}$ of an aromatic system or a $ …
answered Apr 18 '15 by Klaus-Dieter Warzecha
6
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., splitting off water and forming peptide bonds. The resulting molecules are oligopeptides, small brothers of proteines. Imagine that these pools were filled with water again and that the process repeats …
answered Apr 7 '15 by Klaus-Dieter Warzecha
1
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Let's not forget allene as the alternative structure for $\ce{C3H4}$, and - at least in theory - $\ce{C6H4}$ could be bis-cyclopropenylidene ;)
answered Mar 12 '14 by Klaus-Dieter Warzecha
0
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hydrocarbons of different length boiling points of alcohols as compared to their parent hydrocarbons melting points of saturated vs unsaturated fatty acids to get a feeling how structure and different interactions between molecules influence the physical properties. …
answered Jan 29 '14 by Klaus-Dieter Warzecha
2
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Are the use of MATLAB (or OCTAVE) and a self-designed molecular representation mandatory for you project? Established 2D- and 3D representations for molecules beyond a connectivity matrix, i.e …
answered Jul 16 '14 by Klaus-Dieter Warzecha