CPK Atomic Models, Research and Teaching Sets

CPK Atomic Model Teaching Sets

Atomic model research and teaching sets are specially assembled for students, small laboratories and large laboratories.

See Specifications for models and components included in each set.

Item# Description U.S. List Price Quantity
67-6015 CPK® Atomic Models, Research and Teaching Set 1
67-6023 CPK® Atomic Models, Research and Teaching Set 2
67-6031 CPK® Atomic Models, Research and Teaching Set 3
67-6056 CPK® Atomic Models, Research and Teaching Set 4
67-6064 CPK® Atomic Models, Research and Teaching Set 5
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Harvard Apparatus offers a complete line of CPK atomic model research and teaching sets for students, small laboratories and large laboratories. Each set is supplied in a sturdy, partitioned, wooden box. Other sets are available. Please call for details.

Research and Teaching Set 1

For students. Contains sufficient atoms and connectors to build 67-8205 ATP, a twelve-residue alpha-helix back-bone or the base pairs of the nucleic acids, but not simultaneously.

Research and Teaching Set 2

For the smaller laboratory. This Set builds 36 peptide backbone segments in helix forms, three base-pair residues of nucleic acid in double helix form, 67-8205 ATP, steroids, etc.

Research and Teaching Set 3

For the larger laboratory or department where a number of structures, once built, are likely to be left permanently assembled. Constructs 60 peptide backbone segments in helix form.

Research and Teaching Set 4

Includes the atoms to build small-ring compounds such as 67-0400 Cyclobutane, cyclobutanone, ketenedimer, and derivatives in addition to ß-lactams. Also constructs molecules containing functional groups as in alcohols, ketones, aldehydes, esters and amines including their unsaturated derivatives. Useful for demonstrating compounds which undergo photochemical or electron-induced polymerizations as in the acrylates, methacrylates, and other 67-0426 Ethene (vinyl) derivatives.

Research and Teaching Set 5

Includes the atoms in 67-6056 CPK Models Research and Teaching Set 4 above, but in greater quantity to permit construction of compounds of significant biological interest. For example, antibiotics based on small ring compounds such as those found in the penicillins and cephalosporins. There are sufficient compounds to build simultaneously two penicillin and two cephalosporin base structures so that the various side chain compounds such as penicillin B, F, K, and flavicidin can be assembled and compared. This Set also contains components to build 36 peptide backbone segments in helix forms, three base-pair residues of the nucleic acids in double helix form, 67-8205 ATP, steroids, prostaglandins, and many other important, naturally-occurring compounds.

Assembling or Taking Apart CPK Atomic Models is Easy

Assembly 
A Connector Link is placed in the well on the end of the handle of the 67-7120 Construction Tool. The Connector Link is then pressed into the female socket of the atom. The second atom is simply pressed onto the first with a slight twist, and the bond is made.

Taking Apart 
To remove a Connector Link, the forked end of the 67-7120 Construction Tool is slipped around the center groove of the link, and the tool is pried upward.

The atoms are held together with great tenacity. A force of 5 to 7 kg is required to separate them. This force is readily furnished by the levering blade of the 67-7120 Construction Tool.

The marked superiority of the CPK® Atomic Models derives largely from Dr. Koltun’s Connector Links. His analysis of the engineering problems involved led him to combine new plastic materials with innovative link designs which satisfy four critical requirements simultaneously.

Since bond distances and angles for particular atoms are known to vary even in similar structures, two special links, in addition to the standard link, are provided to increase or decrease the normal bond distance by +0.08Å or -0.05Å.

A special ‘gluing’ link is also available for permanently connecting atoms at standard bond distances.

The various link types are color-coded to aid identification.

Specifications

Scale
1.25 cm/Å. Large enough to maintain high accuracy, yet small enough so that macromolecules are not unwieldy. For example, a model 20 x 40 x 100 Å can be built on a table top.

Accuracy
Bond Angles ±0°30’; Covalent radii ±0.01Å; van der Waals radii ±0.03Å. These are as they occur in most biomolecular structures, and these data agree generally with those published by Corey & Pauling. However, several changes reflecting recent observations have been incorporated.

Density
Less than 1.0 gram/ml for a molecule as a whole. For maximum strength with minimum weight, the atoms are hollow. Except for hydrogen, they are injection-molded in Implex, a hard and durable modified acrylic polyester. Hydrogen has an elastically-compressible polyethylene shell.

Color
Atoms and connectors are easily identified since each component is color-coded. The color cannot be worn away since it is an integral part of the plastic. Further, atom surfaces are satin-finished so that they can be lighted easily for vivid photography to illustrate journal articles.

Restricted Rotation
The rotation of certain atoms may be prevented with a special keyed link, see 67-7039 Connector Link, Locking. The rotation of tetrahedral carbons in C-C bonds may be hindered with a special carbon link to produce the three-fold rotational potential characteristic of such bonds, see 67-7047 Connector Link, Carbon.

Hydrogen Bonding
Linear and non-linear bonded hydrogen species provide functional H-bonds to the appropriate species of nitrogen and oxygen. H-bond distance is adjustable.

Special Atom Species
A user may construct additional atom species not offered as regular CPK Atomic Models and use them with the regular CPK Atomic Models by attaching the 67-7088 Socket. This Socket takes all seven of the connector links offered.

Individual Components of Research and Teaching Sets

Information for Reordering

Item # Product

Set 1
67-6015

Set 2
67-6023

Set 3
67-6031
Set 4
67-6056
Set 5
67-6064
67-6577 C-Tetrahedral 30 60 500 100 100
67-6585 C-Ethylenic Double Bond 8 20 60 10 30
67-6593 C-Acetylenic Triple Bond 4 6 20 10 10
67-6569 C-Aromatic-6 18 36 400 15 50
67-6551 C-Aromatic-5 6 18 100 15 20
67-6619 C-Fused 6-6 Rings 4 8 15 2 10
67-6601 C-Fused 5-6 Rings 4 8 20 2 10
67-6528 C-Tetrahedral-4 - - - 4 10
67-6544 C-Trigonal-4 - - - 4 10
67-6536 C-Amide 12 36 60 15 50
67-6692 Hydrogen 40 120 1000 175 150
67-6684 H-Bond, Bayonet Type 2 5 10 - 10
67-6726 H-Bond, Hook Type 20 50 100 - 50
67-6676 Fluorine 4 10 70 5 15
67-6650 Chlorine 4 15 60 5 15
67-6510 Bromine 4 15 60 5 15
67-6734 Iodine 4 10 30 5 15
67-6841 N-Tetrahedral 4 12 50 10 15
67-6833 N-Aromatic-6 6 18 100 5 20
67-6825 N-Aromatic-5 3 9 50 5 10
67-6858 N-Tetrahedral-4 - - - 4 6
67-6866 N-Trigonal-4 - - - 4 6
67-6791 N-Amide 12 36 60 5 40
67-7112 Amine Cap 4 12 40 15 15
67-6874v O-Single Bond 10 36 150 15 40
67-6890 O-Double Bond 8 18 100 25 30
67-6916 O-Indented Double Bond 12 36 100 10 40
67-6924 Phosphorus, Tetrahedral 4 10 40 - 10
67-6957 Sulfur, Diagonal 4 8 20 2 15
67-6973 Metal, Covalent 2 4 20 - 5
67-6981 Metal, Ionic 2 4 20 - 5
67-7005 Connector Link, Standard 200 500 150 250 550
67-7021 Connector Link, Long 10 50 100 5 50
67-7013 Connector Link, Short 10 50 100 5 50
67-7047 Connector Link, Carbon 30 60 500 - 60
67-7039 Connector Link, Locking 10 50 100 - 50
67-7054 Connector Link, Gluing - 50 300 - 50
67-7062 Connector Link, H-Bond 10 25 50 - 25
67-7096 H-Bond Spacer 30 75 150 - 80
67-7088 Socket - 25 100 - 30
67-7138 Wrench, H-Bond 1 1 3 1 1
67-7120 Construction Tool 1 1 3 1 1
67-7179 Pamphlet: Molecules in 3-D 1 1 1 1 1