web2 - 1. Oxyanions of Si, P, and S Huheey, Chapter 16 2....

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Giant Molecules – Inorganic Rings, Chains and Clusters Huheey, Chapter 16 Douglas, p. 238-250 Porterfield, p. 110-128 1. Oxyanions of Si, P, and S 2. Silicates and zeolites 3. Silicones and phosphazenes 4. Borazines and thiazenes 5. Boranes, carboranes and TM clusters – Wade’s rules Catenation – homo (- A - A - A - A -) and hetero (- A - B - A - B -) H Me Me Me Me C C C C C C H H H H H H H H H H H B Me Cl Me N P N P N P Me Me Me Me O Si O Si O Si Me Me Me Me H H oligo = few N B N B N Cl Me Cl S N S N Si Si Si Si Si Si H H H H H H H H H H poly = many 1 A short review of hybridization 2
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 A short review of hybridization 3 Giant Molecules – Inorganic Rings, Chains and Clusters 4
Background image of page 2
3 Giant Molecules – Inorganic Rings, Chains and Clusters 5 Enthalpy Products Activation Barrier Reactants 1 2 CH 4 + 2 O 2 CO 2 + 2 H 2 O H = 4 BE (C-H) + 2 BE (O=O) – 2 BE (C=O) – 4 BE (O-H) Combustion of methane requires ACTIVATION Single vs. Double Bonds, and the Origins of Life Reaction SiH 4 + 2 O 2 "SiO 2 " + 2 H 2 O H = 4 BE (Si-H) + 2 BE (O=O) – 4 BE (Si-O) – 4 BE (O-H) 22_11 Combustion of silanes requires NO ACTIVATON Si-O single bonds (BE = 450 kJ/mol) are strong, e.g., quartz, mica (sheet silicates), silicone polymers . Hybridization at silicon is much more flexible, five coordination is quite common . 6
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Oxygen (the acid maker, and oxyanions) SiO 4 4- PO 4 3- SO 4 2- ClO 4 - Te HO HO OH OH OH OH OH O S OH O vs AsO 4 3- SeO 4 2- BrO 4 - HIO 4 IO(OH) 5 7 Sulfur oxyanions O O S O O O O S O O O S O S O O S O O S O O O O S O S O O S O S S O O O O S O O [H 2 S + SO 3 2- ] 2 S 2 O 3 2- S 4 O 6 2- + 2 e - (used in iodimetry – 123 labs) S 2 O 4 2- 2 SO 2 - (radical) 2 SO 2 + 2 e - (reduces Fe(III), Pb(IV) and O 2 !) S 2 O 8 2- + 2 e - 2 SO 4 2- (oxidizes Mn 2+ to MnO 4 - !!) 8
Background image of page 4
5 Phosphorus oxyanions O O P O O O O P H O OMe MeO P OMe H O P H O O O P O O P O O O O O P O O P O O O O P O O P O O O O O P O O P O O O O P O ATP + H 2 O ADP + PO 4 3- + H + + energy released by converting bridge POP to terminal PO
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 15

web2 - 1. Oxyanions of Si, P, and S Huheey, Chapter 16 2....

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online