Our Lady of Fatima University – Antipolo Campus College of Pharmacy offers PCQA 111, a subject on Pharmaceutical Chemistry of Inorganic Medicinals with Qualitative Analysis.
Jayson Serrano is the instructor for PCQA 111.
Group VIIA Halogens are represented by Berzelius, who suggested the term “halogen” derived from the Greek words “sea salt” and “to produce”, meaning “producer of sea salt”.
The term “halogen” is applied to the four elements – bromine, chlorine, iodine, and astatine – because the sodium salt of their respective hydro acids are very similar to ordinary salts.
The halogens constitute the most active family or group of non-metals in the periodic table.
In the free state, these elements exist as diatomic molecules and due to their activity, the halogens are never found free in nature.
The oxidation property of Halogens decreases with increasing atomic number.
The tendency to be oxidized is, of course, greatest with iodide and least with fluoride.
Technetium is from the decay of Mo-99.
Group VIIB Identification Test: H2S produces a salmon or flesh colored precipitate of MnS.
Manganese Sulfide is involved in phosphorylation, fatty acid and cholesterol synthesis.
Technetium is the most commonly used radiopharmaceutical.
KMnO4 is a manganese compound that acts as an oxidizing agent, antiseptic, and MnO2 masks the blue green color of the glass.
Manganese Sulfide is a salmon-colored sulfur and a trace element that is a cofactor in CHON synthesis for riboflavin.
Parkinsonism is a condition similar to poisoning from Manganese Sulfide.
Braunite is a silicate mineral containing both di- and tri-valent manganese.
Technetium is the first element produced artificially, and it is used in the preparation of radiopharmaceuticals.
NaBiO3 produces a purple solution of HMnO4 (permanganic acid).
Fluorine is the strongest oxidizing agent, also known as the super halogen according to Linus Pauling.
The iodide ion is a strong reducing agent; it readily gives up one electron.
KMnO4, H2SO4, chloroform: violet layer due to the liberation of I2.
Iodine Tincture is a 2% iodine in 50% alcohol with NaI.
Toxicity: Iodism.
Iodine isotopes have wide use in diagnosis and therapy.
Although the iodide ion is colourless, iodide solutions may acquire a brownish tint as a result of oxidation of iodide to free iodine by atmospheric oxygen.
Astatine is the only metallic and synthetic halogen resembling iodine, the only radioactive halogen, and the least electronegative element.
Deficiency: Goiter.
Iodine combines directly with many elements and readily with most metals and some nonmetals to form iodides.
Povidone-Iodine (Betadine®) is a Polyvinylpyrolidone (PVP) with iodophores that liberates free iodine.
In inert solvents, such as carbon tetrachloride or carbon disulfide, violet-coloured solutions that contain uncoordinated iodine molecules are obtained.
AgNO3: Yellow precipitate of AgI insoluble in HNO3.
Potassium Iodide increases the solubility of I2.
Manganese is a silvery-gray metal that resembles iron, is hard and very brittle, and has two salt forms: Hausmannite, a complex oxide of manganese containing both di- and tri-valent manganese.
Iodine preparations include Iodine solution (2% I2 in H2O), Strong iodine solution (Lugol’s soln, 5% iodine in water with KI), Iodine tincture, and disinfectant (2% Iodine solution; 50% alcohol with KI).
Mandel’s Solution is a carbolised iodine solution used as an antiseptic.
Boulton’s Solution is a phenolated iodine solution used as a disinfectant.
Group VIIB Manganese is a co-factor in protein synthesis, phosphorylation, fatty acid and cholesterol synthesis, and is poisonous, causing Parkinson-like symptoms.
Fluorine is poisonous and the principal manifestation of fluorine poisoning is mottled enamel and abnormal bone growth.
Sodium fluoride (NaF) is used as an anti-cariogenic at 2% solution in 4 applications.
Sodium fluoride (NaF) is also used in the preparation of sodium fluoride-phosphate (Na2FPO3), which is also anti-cariogenic.