Vintage Framework Molecular Model kit, Wooden Box, Prentice Hall, GREAT SHAPE!, US $145.00 – Picture 0

Vintage Framework Molecular Model kit, Wooden Box, Prentice Hall, GREAT SHAPE!, US $145.00 – Picture 1

Vintage Framework Molecular Model kit, Wooden Box, Prentice Hall, GREAT SHAPE!, US $145.00 – Picture 2

Vintage Framework Molecular Model kit, Wooden Box, Prentice Hall, GREAT SHAPE!, US $145.00 – Picture 3

Vintage Framework Molecular Model kit, Wooden Box, Prentice Hall, GREAT SHAPE!, US $145.00 – Picture 4

Vintage Framework Molecular Model kit, Wooden Box, Prentice Hall, GREAT SHAPE!, US $145.00 – Picture 5

Vintage Framework Molecular Model kit, Wooden Box, Prentice Hall, GREAT SHAPE!, US $145.00 – Picture 6

Vintage Framework Molecular Model kit, Wooden Box, Prentice Hall, GREAT SHAPE!, US $145.00 – Picture 7

Vintage Framework Molecular Model kit, Wooden Box, Prentice Hall, GREAT SHAPE!, US $145.00 – Picture 8

Vintage Framework Molecular Model Kit, Wooden Box, Prentice Hall, Great Shape!

US $145.00

Seneca, South Carolina, United States
Feb 28th

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This is a very RARE Framework Molecular Orbital Model Kit in its original WOODEN BOX. It is quite beautiful considering the kits that are sold today, when even some so-called "vintage" kits have plastic boxes of half this size. The box has some scratches on it, but the latch works and overall is in very good condition. I cannot say 100% of the original pieces are present, but most are; I made a molecule of cryptophycin (very large) which was fun. Even if one ran out of certain colored bonding parts (unlikely), similar pieces can be purchased in modern kits. This Framework Molecular Orbital (FMO) model kit was patented in 1963 and was state-of-the-art in molecular modeling of that time. THIS IS ANOTHER PIECE OF CHEMISTRY HISTORY that would look great in anyone's office, especially a chemistry professor. A great gift. Now, these so-called vintage model kits that comein plastic containers sell for $25-$50, so this original, substantial kit in its beautiful wood box is a bargain at $145. Very hard to find anything like it; anyone who has one would not be likely to want to part with it. Buy it today for someone you love, or for yourself. There is only ONE available! We at Community Books always have vintage chemistry books, glassware, and other items. So if you are seeking something particular, please let us know. The model kit, like all our items, comes with a 100% money back guarantee if you are not satisfied for any reason. We strive to earn 5-star ratings on all our sales. Please contact me if you would like more info, pictures, or postage costs. Lengthy Patent Info: United States Patent 3,080,662 Patented Mar. 12, 1963 3,080,662 MOLECULAR MGDEL SET George C. Brumlilr, 331 E. 71st St, New York, N.Y. Filed Feb. 2, 1961, Ser. No. 86,722 18 Claims. (Cl. 3518) The present invention relates generally to models used for representing atoms and molecules, and in particular to a novel and improved model of this type including provision for representation of molecular and atomic orbitals. Recent development of valence theories and physical molecular investigation have now reached the point where it is possible to consider those features of atomic and molecular orbitals which determine molecular structure and are of importance in chemical reactions. Each particular atom of an element participating in a covalent bond has a fixed covalent radius defining a sphere which can be regarded as the covalent core of the atom, and in addition may have orbital lobes traced by non-bonding valence electron pairs or' by electrons that form a molecular pi orbital, e.g., the s and p orbital lobes and their hybrid forms. These valence orbital interact to form the covalent bonds. Either of the s and p orbitals can overlap to form sigma bonds, while the p orbitals can form pi bonds in addition to sigma bonds. Further, the valence electrons which are not used to form bonds are localized and trace orbitals which are known as unshared electron pair orbitals, occupying molecular volume of appreciable magnitude. A fully saturated atom, all the electrons of which are involved in sigma bonds, is substantially spherical in shape, its radius constituting the covalent radius. Sigma bond orbitals are localized between the covalent cores which they connect, and do not project beyond the area of contact between the two bonded atoms so as to increase the volume thereof. Prior art chemical models which represent atoms as one-piece bodies of spherical shape or other shapes are adequate to represent such atoms. When an atom is unsaturated or has non-bonding valence electrons, electronic orbital lobes are found to rise considerable distances beyond the surface of the covalent core and to assume characteristic shapes, volumes, and spatial orientations. Such lobes may be regarded as a force field defined by the electron density distribution as determined by the wave function whose square is related to the probability of the electron location. These orbital lobes contribute to the atomic volume beyond the volume of the covalent core in the form or protrusions, and may therefore be referred to by the coined term volume orbitals. the unshared electron pair orbitals, and the other type being the molecular pi orbitals. The latter are formed by the overlap of atomic p orbitals, extending over two or more atoms forming a double streamer polynuclear orbital. When it is considered that the distance which 'a typical volume orbital extends beyond the surface of ment of volume orbitals accounts for the distinctive shape and directional character of the various covalent bonds which they form, which in turn determines important physical and chemical properties of the resulting organic radical, molecule or ion. Further, a given unsaturated atom can assume different sizes and shapes when it is Volume orbitals are of two types, one being a covalent core is of the same order of magnitude as the in difierent states of hybridization, that is, when the available quantized energy levels are distributed among the orbital electrons in different ways, and it is important to be able to represent these various states. The modern view of atomic structure recognizes the important difference between the sigma bond and the pi bond. While the sigma bond is localized between two atoms which are bonded together by it, the pi bond consists of two double streamers formed by the overlap of two p atomic orbital lobes which lie above and below the cores of the atoms. This geometry enables the pi bonds to overlap with neighboring pi bonds or unshared pair orbitals to form large polynuclear orbitals. In effect these large double streamer molecular orbitals are formed by the overlap of numerous atomic p orbital lobes. In some cases there are other types of interactions, for example, an inter-orbital repulsion between the nearby orbital lobes of two radicals which are bonded to each other. When this occurs, the resulting steric hindrance may set a definite limit to the relative positions which can be assumed by the two radicals and the resulting molecule may consequently be excluded from certain orientations in space or conformations. Effects such as these which arise from the physical presence and arrangement of the volume orbitals are incapable of representation by present chemical models. It is broadly an object of this invention to remedy some of the aforesaid deficiencies. In particular, it is an object of the invention to provide a chemical model which is capable of representing the volume orbitals and of demonstrating their spatial arrangements and interactions so as to exemplify the important role which they play in chemical reactions. These models by being able to depict various types of molecular orbitals, are peculiarly capable of illustrating reactive sites present in the molecule such as acidic and basic sites, sites susceptible of oxidation or reduction, etc. By such representation, predictions can be made as to the course of chemical reactions or the shape and properties of known molecules or even those not yet synthesized. Another object of the invention is to provide a chemical model of the type described which is capable of representing the greatest number of molecules, radicals and ions with the smallest number of different piece-types, so as to minimize the cost of a model set of any given size.

Condition:	Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. ...	Brand	Prentice Hall
Country/Region of Manufacture	United States
Model	FMO US Patent 3,080,662