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Topic: HSAB concept

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	HSAB theory - Wikipedia, the free encyclopedia
		Ralph Pearson lecturing in Northwestern University in 1969.
		The HSAB concept, also known as HSAB theory, is widely used in chemistry for explaining stability of compounds, reaction paths etc. HSAB is the acronym for hard and soft acids and bases It assigns the terms 'hard' or 'soft', and 'acid' or 'base' to chemical species.
		HSAB theory is also useful in predicting the products of metathesis reactions.
	en.wikipedia.org /wiki/HSAB_concept (426 words)

	Chemistry 351 Goals for Days 1-8
		Know that in the Pearson Hard-Soft Acid Base concept Lewis acids and bases are characterized as “hard” or “soft”.
		Be able to classify a species as a hard acid, hard base, soft acid, soft base, borderline acid or borderline base given its electronegativity and position on the periodic table.
		Know that the HSAB principle can be used to predict the outcome of a chemical reaction.
	people.morehead-st.edu /fs/a.macintosh/351goalsdays18.html (492 words)

	Software-Entwicklung in der Chemie*10 - Bögel, H.
		Visualisation of the extent of molecular properties in different areas of the molecule is a helpful and important technique to support structural concepts by computer graphics, to relate the expected or observed physico-chemical properties and the chemical behaviour of molecules to the calculated electronic structure.
		Hardness and softness in the sense of the HSAB (Hard and Soft Acids and Bases) concepts [1] were developed on the basis of empirical data.
		Further development of the visualisation of the two important properties of an electronic structure, the hard- and softness will be the interpretation of the calculated Fukui function and a distance dependent contribution from neighbouring atoms to the value of an atomic surface area.
	scholle.oc.uni-kiel.de /users/cic/tagungen/workshop95/boegel/index.html (1262 words)

	softness sensitive bond valence parameters (Site not responding. Last check: 2007-09-10)
		Thus, applications of the bond-valence concept to any field that might be affected by the shape of the bond-length bond-valence pseudopotential should not rely on bond-valence parameter sets with a fixed parameter b.
		In an earlier investigation on a possible connection between bond softness and bond valence, Urusov (1995) had argued that the softness of a bond should increase with the sum of the softnesses of the interacting particles.
		In harmony with the HSAB concept, bonds between atoms with different softnesses tend to be weaker and therefore correspond to larger values of the parameter b (solid line: fourth-order polynomial fit to all data; broken lines: 99% confidence interval).
	kristall.uni-mki.gwdg.de /softbv/intro2.html (1149 words)

	HRDG CSIR
		Acids and Bases: Bronsted and Lewis acids and bases, pH and pKa, acid-based concept in non-aqueous media; HSAB concept.
		Concept of Chirality: Recognition of symmetry elements and chiral structures; R-S nomenclature, diastereoisomerism in acyclic and cyclic systems; E-Z isomerisms.
		Excess functions, activities, concept of hydration number: activities in electrolytic solutions; mean ionic activity coefficient; Debye-Huckel treatment of dilute electrolyte solutions.
	csirhrdg.res.in /CS.htm (1252 words)

	kaj02
		He proposed a concept of ionization of lubricant components by low-energy exoelectrons (1 to 4 eV), which are emitted from freshly formed surfaces in the friction of mating surfaces.
		The concept is based upon the ionization mechanism of ceramic lubricant compound molecules caused by the action of exoelectrons.
		It is their intention to explore several existing unknowns in the area of triboemission, and to extend their work to other materials of tribological application and some metal catalysts.
	www.tribologia.org /ptt/kaj/kaj02.htm (5465 words)

	[No title] (Site not responding. Last check: 2007-09-10)
		Pearson's HSAB concept acid-base strength and hardness and softness.
		Roman Spectrum concept of polarizability, pure rotational and pure vibrational Raman Spectra of diatomic molecules, selection rules.
		Concept of Potential Energy curves for bonding and antibonding molecular orbitals, qualitative description of selection rules and Frank Condon principle.
	www.uniraj.ernet.in /syllabi/B.Sc-III/Chemistry.html (1470 words)

	B-52 Stratofortress - United States Nuclear Forces
		So the B-52 can carry a maximum of either 51 or 45 munitions, depending on which pylon is mounted under the wings.
		However, the AGM-28 pylon is no longer used, so the B-52 currently carries on HSABs, limiting the external load to 18 bombs, or a total of 45 bombs.
		Boeing proposed modernizing the B-52 fleet by replacing the current TF-33 engines with a commercial engine through a long-term leasing agreement, and providing fixed-cost, privatized maintenance based on the number of hours flown each year.
	www.fas.org /nuke/guide/usa/bomber/b-52.htm (2464 words)

	ETH Zürich - Creative Chemistry on the Internet
		The potassium permanganate ignites after a short induction period, thereby igniting the entire mixture.
		The sulphides' differing tendencies to form, as shown in this experiment, can be explained using R. Pearson's HSAB concept (Hard and Soft Acids and Bases Principle).
		The HSAB principle states that the tendency of bonds to form between soft acids and soft bases or hard acids and hard bases is particularly high, while it is lower between hard acids and soft bases or soft acids and hard bases.
	www.cci.ethz.ch /experiments/darst_Met-S/en/vertiefung/1.html (411 words)

	UCL /SC - Study Programme : CHM1241
		The electronic effects will be discussed again and linked to the notions of stabilisation of charges and to acid-basic properties of certain classes of organic functions.
		The HSAB concept will also be introduced and connected to the concepts of electronegativity and polarization.
		These principles will be applied to aromatic chemistry and the control of orientation in electrophilic aromatic substitution reactions will be developed and applied to concrete problems of everyday's life (paracetamol, ibuprofen,..).
	www.ucl.ac.be /etudes/cours/en/chm1241.html (382 words)

	Species/Species Interactions
		Woodward and Hoffmann explained the chemical reactivity of an apparently diverse set of reactions involving pi-systems using FMO theory and pericyclic reactions, here.
		Pearson proposed the hard, soft, [Lewis] acid, base (HSAB) principle.
		The charge/charge interaction is determined by the relative charges, q, associated with r and s, the Coulombic repulsion (or attraction), the polarity of the solvent and all the various solvation and desolvation energies.
	www.meta-synthesis.com /webbook/20_species-interact/interactions.html (1835 words)

	Amazon.com: "soft acids": Key Phrase page (Site not responding. Last check: 2007-09-10)
		This statement is now known as the hard and soft acid-base, or HSAB, Principle.
		Theory of acid-base cements 2.3.7 Hard and soft acids and bases (HSAB) This concept of Chatt and his coworkers was developed further by Pearson (1963, 1966, 1968a,) in his...
		Pearson [79-85] suggested the "Principle of Hard and Soft Acids and Bases" (HSAB), which states, "Hard acids prefer to coordinate, bind, or react with hard bases, and soft acids prefer...
	www.amazon.com /phrase/soft-acids (604 words)

	chem481c2
		Application of the HSAB Concept to Qualitative Analysis
		Efforts have been made to replace liquid acids with solid catalysts such as acidic resins, supported Lewis-acids, zeolites, phosphates, and modified metal oxide based systems; demanding that the acidity of these materials be characterized.
		The numerous concepts which have been developed to describe acidity (e.g.
	www.chem.latech.edu /~upali/chem281/281GRCc8.htm (4804 words)

	[No title]
		This had been demonstrated for Zr and Hf and was assumed for Rf.
		Due to the HSAB concept, Sg shows a higher affinity to F
		Thus, the tendency to form anionic fluoride complexes should increase from Rf to Sg.
	www.kernchemie.uni-mainz.de /jvkratz/meinejabes/jabe97.html (592 words)

	Publ. Pol.
		"Density Functional Theory based concepts in the quantum chemical study of zeolites and their interaction with small molecules".
		"Use of the HSAB principle in Quantitative Structure-Activity Relationship in Toxicological Research : Application to the Genotoxicity of Chlorinated Hydrocarbons".
		"The influence of alkylating reagent softness on the regioselectivity in enolate ion alkylation : a local HSAB Study".
	we.vub.ac.be /~algc/PAUL/biblio_p_G2.htm (6206 words)

	ANNEX F Common Solution/Concept List (U) Air Force Mission Area Plan (MAP)
		The final system required for total EBMM integration will be the Onboard Mission Planning System (concept B520019).
		This will provide the crew with the rapid response capability to change aircraft and weapon mission plans to respond to real-time intelligence.
		The modification would delete currently used AN/ALE-20 system and add new flare dispensers, processor and controller, and a new 360 degree missile warning sensors and computer.
	www.fas.org /man/dod-101/usaf/docs/mast/annex_f/part08.htm (7053 words)

	Amazon.com: "hard solvents": Key Phrase page (Site not responding. Last check: 2007-09-10)
		See all pages with references to hard solvents.
		of the HSAB concept (Pearson 1963), according to which the interactions of soft solvents are strongest with soft solutes, of hard solvents with hard solutes, but are weaker for hard solvents with soft solutes and vice versa.
		Key Phrases in this book: New York, Faraday Trans, Solution Chem, Perkin Trans, Pure Appl, Chemical Abstracts, miscible miscible, electron pair donicity, diethyl sulfite, hydrogen bond donation ability, pentamethylene sulfide, ethyl trichloroacetate (See more)
	www.amazon.com /phrase/hard-solvents (499 words)

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