Morphine (C₁₇H₁₉NO₃) — Properties, Uses & Safety

Overview

Morphine (C17H19NO3) is a powerful opioid analgesic and the principal active compound in opium, derived from the opium poppy (Papaver somniferum). With a molar mass of 285.34 g/mol, morphine is a white crystalline alkaloid that has been used for pain relief since its isolation by Friedrich Sertürner in 1804, making it the first active ingredient ever isolated from a plant. The name morphine comes from Morpheus, the Greek god of dreams, reflecting its sedative properties. Morphine's complex molecular structure features five fused rings, including a phenanthrene core, a piperidine ring, and an oxygen-containing bridge. It contains multiple functional groups: a phenolic hydroxyl group, an alcoholic hydroxyl group, a tertiary amine, and an ether linkage. This structural complexity made its total synthesis a landmark achievement in organic chemistry, first accomplished by Marshall Gates in 1952. Morphine works by binding to mu-opioid receptors in the brain and spinal cord, mimicking the body's natural endorphins. This produces profound pain relief (analgesia), euphoria, sedation, and respiratory depression. It is used clinically for severe pain management in post-surgical care, cancer treatment, and palliative medicine. Morphine is the gold standard against which all other opioid analgesics are measured. However, morphine carries significant risks. It is highly addictive, producing both physical dependence and tolerance with repeated use. Respiratory depression is the primary cause of death in opioid overdoses. Morphine is classified as a Schedule II controlled substance in the United States. The opioid crisis, which has claimed hundreds of thousands of lives, underscores the importance of understanding both the benefits and dangers of this compound. GHS hazard pictograms include the skull and crossbones (acute toxicity) symbol. For chemistry students, morphine illustrates advanced organic chemistry concepts including polycyclic ring systems, stereochemistry (it has five stereocenters), alkaloid chemistry, and structure-activity relationships. The modification of morphine's structure to create other opioids — codeine (methylation of the phenolic OH), heroin (diacetylation of both OH groups) — demonstrates how small structural changes dramatically alter a drug's potency, duration, and addictive potential.

IUPAC Name

(4R,4aR,7S,7aR,12bS)-3-methyl-2,3,4,4a,7,7a-hexahydro-1H-4,12-methanobenzofuro[3,2-e]isoquinoline-7,9-diol

CAS Number

57-27-2

PubChem CID

5288826

Molecular Formula

C₁₇H₁₉NO₃

Molar Mass

285.34 g/mol

State at STP

solid

Appearance

White crystalline powder

Physical Properties

Melting Point

255 °C

Density

1 g/cm³

Composition