The icosahedral closo carboranes dicarbaclosododecaboranes. Carboranes article about carboranes by the free dictionary. Title metallacarboranes and their interactions nui galway. Any of a class of stable crystalline compounds composed of carbon, boron, and hydrogen. Carborane chemistry has experienced a major surge of interest across a wide spectrum of technologies, fueled by developing applications in diverse areas such as. Most of the carborane derivatives of the icosahedral c2b10 or small cage c2b4 systems are formed, by varying the groups on the cage carbons. Examples of nido and arachno carboranes include 2,3c 2 b 4 h 8 and 1,3c 2 b 7 h, respectively. Metalcontaining carboranes with antitumor activity. Metallacarboranes carboranes incorporating one or more metal atoms in the cage framework, alternatively described as metalcarborane complexes, comprise a huge family of compounds of which thousands have been prepared and characterized. Studies on 4,1,6mc 2b 10vertex metallacarboranes have shown that the partial degrada. Carborane article about carborane by the free dictionary.
Abstract most carborane derivatives of the icosahedral c2b10 or small. Carborane definition of carborane by the free dictionary. Get ebooks advanced inorganic chemistry vollume ii on pdf, epub, tuebl, mobi and audiobook for free. Recent advances in the chemistry of carboranes and. The borane fragments and clusters of nuclearity b 1 to b 12 have been derived using skeletal numbers and valences. In carboranes, the b and c atoms are arranged at the vertices of the more or less regular polyhedron. The borane clusters and their relatives strictly obey the law of skeletal numbers and valences. These reactions led directly to the carbons adjacent carboranes in which the carbon atoms occupy adjacent positions in the cage. For paul weiss of pennsylvania state university in university park and his colleagues, the tablecloth is a selfassembling layer of nanosized molecules called carboranes. C 2 b 10 h 12 are an interesting class of exceptionally stable boronrich clusters with high thermal and chemical stability, hydrophobicity and acceptor character 1,2,3.
Nanoparticlebased formulation of metallacarboranes with. They are very useful synthons for the synthesis of metallacarboranes of p, d, and. Boranes, carboranes, metalloboranes, transition metal. Carboranes, third edition, by russell grimes, is the definitive resource on the subject. Advanced inorganic chemistry vollume ii ebook download free. Always update books hourly, if not looking, search in the book search column. Boron chemistry a rapidly expanding research field. Boranes and carboranes with odd skeletal electron counts are rare. Carboranes have as few as 5 and as many as 14 atoms in the cage framework 15 if metal atoms are included are known, but the majority have two cage carbon atoms. Therefore, in an icosahedral metallacarborane derived from closo1,2c2b10h12 in which the cage c atoms retain their adjacency, and whose crystal structure is free from disorder 16, it should be fairly obvious which. Chapter 4 reports the double cage decapitation of 1,1.
This chapter presents a detailed summary of this area in its many facets, including methods of synthesis. Tjarks, carborane clusters in computational drug design. Removal of such edges converts degree 6 boron vertices in the. Carboranes definition of carboranes by the free dictionary. Carboranes, second edition is designed as a comprehensive source of information in a field that has experienced enormous growth in both its fundamental and applied aspects in the four decades since the publication of carboranes 1970. There are more than 1 million books that have been enjoyed by people from all over the world.
Carboranes synonyms, carboranes pronunciation, carboranes translation, english dictionary definition of carboranes. The goal was to find out the distribution of the free ligands. International conference organometallic and coordination chemistry. Novel sulfur containing derivatives of carboranes and. Request pdf carboranes and metallacarboranes introductioncarborane structures and skeletal electron numberslocalized bond schemes for closo boranes and carboranesmo treatments of closo.
Since then, many thousands of carboranes have been prepared, and they have been combined with transition metals to yield derivatives called metallacarboranes, some of which show catalytic activity. Request pdf on researchgate carboranes and metallacarboranes introductioncarborane structures and skeletal electron numberslocalized bond. The only other redoxfree ligation processes were found in. A carborane molecule is a cage of 10 boron atoms and two carbon atoms, and extra atoms can be attached to the cage. What can we learn from the crystal structures of metallacarboranes. One of the b or c atoms in carboranes can be replaced by one atom of another element, such. Department of chemistry and biochemistry, northern illinois university, dekalb. Boranes, carboranes, metalloboranes, transition metal carbonyls and other cluster formulas obey the law of skeletal numbers and their valences bipyramid one and 116 an octahedral shape 18. Electrochemistry and photoluminescence of icosahedral. Moving from a pure physisorption to kubas type of h 2 binding increases the binding strength, which can ensure room temperature storage. Fundamental and applied aspects international youth schoolconference on organometallic and coordination chemistry september 17, 20, n.
Other articles where metallacarborane is discussed. Metal free carboranes having vertices are anomalous since their closo polyhedra having the expected 28 skeletal electrons are not the usual deltahedra with exclusively triangular faces but instead polyhedra with one or two trapezoidal faces obtained by removal of one or more edges from the corresponding vertex deltahedron. Icosahedral boranes, carboranes, and metallacarboranes are extraordinarily robust compounds with desirable properties such as thermal and redox stability, chemical inertness, low nucleophilicity, and high hydrophobicity, making them attractive for several applications such as medicine, nanomaterials, molecular electronics, energy, catalysis, environmental chemistry, and other areas. Geometrical isomers of carboranes can exist, necessitating the use of the numerical prefixes in a compounds name. Crystals 2017, 7, 234 3 of 19 hbonding interactions 15, afforded cc 1. Request pdf carboranes and metallacarboranes introductioncarborane structures and skeletal electron numberslocalized bond schemes for closo.
1312 1478 1222 930 926 291 1188 750 400 1096 395 994 551 621 1245 1197 1523 1586 899 121 935 1382 564 197 782 1104 22 43 722 285 718 139 218 362 1188 1444 1140 948 601 578 100 544 62 1434 1306