Carbon–beryllium Bond
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Carbon–beryllium Bond
Organoberyllium chemistry involves the synthesis and properties of organometallic compounds featuring the group 2 alkaline earth metal beryllium (Be). The area remains less developed relative to the chemistry of other main-group elements, because Be compounds are toxic and few applications have been found. Structure Homoleptic compounds The coordination number of Be in organoberyllium compounds ranges from two to four. Dimethylberyllium and dimethylmagnesium adopts the same structure. Diethylberyllium, however, does not structurally resemble diethylmagnesium (which has the same structure as dimethylmagnesium). This contrast is attributed to the small size of Be relative to its heavier congener Mg: Be is one of the smallest atoms on the periodic table. Dineopentylberyllium and many other dialkyl derivatives has been reported. The phenyl derivative is represented by trimeric Be3Ph6. A terphenyl derivative is known. With bulky aryl ligands three-coordination is observed, see . ...
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Crystal Structure Of A BePh2 Complex That Produce Dimers
A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macroscopic single crystals are usually identifiable by their geometrical shape, consisting of flat faces with specific, characteristic orientations. The scientific study of crystals and crystal formation is known as crystallography. The process of crystal formation via mechanisms of crystal growth is called crystallization or solidification. The word ''crystal'' derives from the Ancient Greek word (), meaning both "ice" and "rock crystal", from (), "icy cold, frost". Examples of large crystals include snowflakes, diamonds, and table salt. Most inorganic solids are not crystals but polycrystals, i.e. many microscopic crystals fused together into a single solid. Polycrystals include most metals, rocks, ceramics, and ice. A third category of sol ...
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Beryllocene Conformation
Beryllocene is an organoberyllium compound with the chemical formula Be(C5H5)2, first prepared in 1959. The colorless substance can be crystallized from petroleum ether in the form of white needles at −60 °C and decomposes quickly upon contact with atmospheric oxygen and water. Preparation Beryllocene can be prepared by reacting beryllium chloride and sodium cyclopentadienide in benzene or diethyl ether: :\mathrm Properties Physical In contrast to the uncharged metallocenes of the transition metals V, Cr, Fe, Co, Ni, Ru and Os, which have a strictly symmetrical and therefore dipoleless structure, beryllocene has an electric dipole moment of 2.46 Debye (in benzene), or 2.24 Debye (in cyclohexane), indicating asymmetry of the molecule. In the IR spectrum there are signals at 1524, 1610, 1669, 1715 and 1733 cm−1, which also indicate that the structure does correspond to that of ferrocene. In contrast, the nuclear magnetic resonance spectrum shows only ...
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Beryllium
Beryllium is a chemical element; it has Symbol (chemistry), symbol Be and atomic number 4. It is a steel-gray, hard, strong, lightweight and brittle alkaline earth metal. It is a divalent element that occurs naturally only in combination with other elements to form minerals. Gemstones high in beryllium include beryl (Aquamarine (gemstone), aquamarine, emerald, red beryl) and chrysoberyl. It is a Abundance of the chemical elements#Universe, relatively rare element in the universe, usually occurring as a product of the spallation of larger atomic nuclei that have collided with cosmic rays. Within the cores of stars, beryllium is depleted as it is fused into heavier elements. Beryllium constitutes about 0.0004 percent by mass of Earth's crust. The world's annual beryllium production of 220 tons is usually manufactured by extraction from the mineral beryl, a difficult process because beryllium bonds strongly to oxygen. In structural applications, the combination of high flexural ri ...
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Group 2 Organometallic Chemistry
image:GOHRUQ.png, Magnesium anthracenide with three thf ligands. Group 2 organometallic chemistry refers to the organic compound, organic derivativess of any group 2 element. It is a subtheme to main group organometallic chemistry. By far the most common group 2 organometallic compounds are the magnesium-containing Grignard reagents which are widely used in organic chemistry. Other organometallic group 2 compounds are typically limited to academic interests. Characteristics As the group 2 elements (also referred to as the alkaline earth metals) contain two valence electrons, their chemistries have similarities group 12 element, group 12 organometallic compounds. Both readily assume a +2 oxidation states with higher and lower states being rare, and are less electronegative than carbon. However, as the group two elements (with the exception of beryllium) have considerably low electronegativity the resulting C-M bonds are more highly polarized and ionic bond, ionic-like, if not entirel ...
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Dimethylmercury
Dimethylmercury is an extremely toxic organomercury compound with the formula ( CH3)2 Hg. A volatile, flammable, dense and colorless liquid, dimethylmercury is one of the strongest known neurotoxins. Less than 0.1 mL is capable of inducing severe mercury poisoning resulting in death. Synthesis, structure, and reactions The compound was one of the earliest organometallics reported, reflecting its considerable stability. The compound was first prepared by George Buckton in 1857 by a reaction of methylmercury iodide with potassium cyanide: : 2 CH3HgI + 2 KCN → Hg(CH3)2 + 2 KI + (CN)2 + Hg Later, Edward Frankland discovered that it could be synthesized by treating sodium amalgam with methyl halides: : Hg + 2 Na + 2 CH3I → Hg(CH3)2 + 2 NaI It can also be obtained by alkylation of mercuric chloride with methyllithium: : HgCl2 + 2 LiCH3 → Hg(CH3)2 + 2 LiCl The molecule adopts a linear structure with Hg–C bond lengths of 2.083 Å. Reactivity and physical propert ...
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Simon Aldridge
Simon Aldridge FRS is a British chemist specialising in inorganic chemistry, with a particular focus on the chemistry of main group elements. He is currently a Professor of Chemistry at the University of Oxford and a Fellow and Tutor in Inorganic Chemistry at The Queen’s College, Oxford. His research has significantly contributed to the field of main group chemistry. Aldridge has been recognised with several awards, including a Fellowship of the Royal Society (FRS) in 2024. Early life and education Aldridge was born in Shrewsbury, United Kingdom. He studied chemistry at Jesus College, University of Oxford, earning a Bachelor of Arts degree with first-class honours in 1992. He went on to complete a Doctor of Philosophy (DPhil) in Inorganic Chemistry at Oxford in 1996, under the supervision of A.J. Downs. His doctoral thesis focused on the chemistry of volatile compounds of main group elements. Academic career Aldridge began his academic career as a Post-doctoral Associate a ...
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