Page 16 - Color Atlas of Biochemistry

Chemistry 7

A. Molecule illustrations B. Bond lengths and angles
Chiral center
H O H

O H H 124 pm pm 110 pm 140 pm
111 154 pm 110° 137 pm
C C C O 120°
120° 110° 110° 120° 108° 95 pm
O H H 149 pm 120° 120°
110° 100 pm
H N H H H 110° 110°
H

1. Formula illustration C. Bond polarity

2. Ball- and-stick model

Positive Neutral Negative

1. Partial charges in L-dopa

0.9 2.1 2.5 3.0 3.5 4.0
Na H C N O F

1 2 3 4
Increasing electronegativity
3. Van der Waals model 2. Electronegativities

D. Hydrogen bonds
Dissociated Protonated
Acid Base Donor Acceptor
acid base

A H B A H B A H B

Initial state Hydrogen bond Complete reaction
1. Principle

H 290 pm
280 pm
H N C O N H O
O N CH 3
H H C O H N HC C C C C
270–280 pm
H H
O O R 1 CH HC R 2 N C N H N CH
H H N H O C R N C 290 pm C N
H O R
Water Proteins DNA
2. Examples

Koolman, Color Atlas of Biochemistry, 2nd edition © 2005 Thieme
All rights reserved. Usage subject to terms and conditions of license.