Characterization Data
Reported characterization data, and where lot-specific values belong.
The following are general characterization properties reported for Phenibut hydrochloride as a laboratory material. Lot-specific values, where determined, are identified on the applicable documentation.
- AppearanceWhite to off-white crystalline powder
- Salt formHydrochloride
- SolubilityThe hydrochloride salt is water-soluble; solubility of the free base differs from the salt
- Molecular formulaC10H14ClNO2 (HCl); C10H13NO2 (free base)
- Molecular weight215.68 g/mol (HCl); 179.22 g/mol (free base)
- Functional groupsPrimary amine, carboxylic acid (an amino acid), aromatic ring
- CharacterAmphoteric (contains both amine and carboxyl groups)
Two kinds of entry in that table
The list above mixes two things that behave very differently, and reading it as a single flat set of “properties” is a common source of confusion. Some entries are invariants of the compound: the molecular formula, the molecular weight, the functional groups present, the amphoteric character that follows from having both an amine and a carboxyl group. These are derived from the structure. They do not vary from one lot to the next, they are not measured on arrival, and there is no meaningful sense in which a particular sample could disagree with them — if it did, it would not be this compound.
Other entries describe a sample rather than the compound. Appearance is an observation of the material in front of you. How a given sample behaves when it is dissolved or heated depends on that sample. These entries can legitimately differ between lots without anything being wrong, which is exactly why they belong on lot documentation and the invariants do not.
Why a reported value depends on how it was obtained
A property is inseparable from the procedure used to establish it, and a value quoted without its method is difficult to compare with anything.
- Appearance is observed, not measured. A description such as “white to off-white crystalline powder” is a range of acceptable observation, not a graded scale. Crystal habit, particle size and the light the material is viewed under all shift the impression, so two competent observers can describe the same sample slightly differently without either being mistaken.
- Thermal behaviour depends on technique. How a solid responds to heating varies with the instrument and the heating rate, and an amino-acid hydrochloride may decompose rather than melt cleanly. Where that happens a single sharp figure misrepresents what actually occurs, and the observed onset is characteristic of the method as much as of the material.
- Solubility statements are qualitative until a procedure is attached. Describing the salt as water-soluble records a qualitative fact about the form. Turning that into a figure requires a stated solvent, a stated temperature and a defined endpoint; without them, two numbers from two sources are not comparable.
None of this makes reported characterization data unreliable. It makes it contextual, which is why the analytical methods behind such observations are set out separately under analytical identification.
Stability & storage considerations
As with many amino-acid hydrochlorides, Phenibut HCl should be kept in a closed, clearly labeled container, cool and dry, and protected from moisture and incompatible substances. Follow the storage information provided with the material and any accompanying Safety Data Sheet. See safety data & laboratory handling.
Why characterization matters
Physical properties support identity confirmation and correct handling. They are documentation data, not usage information. For the analytical methods used to confirm these properties, see analytical identification.
What follows for a lot record
The practical consequence is a simple sorting rule. Structure-derived invariants can be carried forward from the chemical record and cited as they stand; they are documented on our identifiers reference. Sample-dependent observations cannot be inherited from a catalogue entry or from another lot — where they matter to a piece of work, they belong to the specific material and its own paperwork. What such a document does and does not establish is covered on the Certificate of Analysis page, and the records that tie a value to a particular consignment are described under lot traceability.
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