Group VII/17 elements

High-spin Cr(II) compounds are Jahn-Teller distorted and invariably very labile. The low-spin [CrLa] ions (e.g., L = bipy, phen) are more inert and can be investigated by stopped-flow methods. Recent examples include L = bipy with substituents in the 3,3 positions (3,3 -CHCH and 3-Me).  

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The ML method has been successfully applied to the synthesis of monolayers ranging from Group II to Group VII elements onto oxides of aluminum, zirconium, magnesium, titanium, and glass. Metal, carbon fiber, and semiconductor substrates have also been used. 

Impurity doping with group III elements (Al, Ga, In, B) or with group IV elements (Si,Ge, Ti Zr, or Hf) incorporated substitutionally on Zn-sites. Alternatively also group VII elements have been used such as F incorporated on an 0-site. The lowest values achieved today range at 1.5 - 2x 10 " Gem rather independent of the method of preparation. 

The correct answer is (B). N, P, As, and Sb are all group V elements that can form three single bonds with fluorine to yield an octet. Iodine, a group VII element, according to the octet rule, should only be able to combine with one fluorine atom. Combining with 3 is a violation of the octet rule. 

A general review on rhenium complexes containing poly(pyrazolyl)borates appeared in 1998.110 In 2004, an overview of the progress involving group VII elements and actinide was presented by Santos and coworkers,111 who very recently described also rhenium and technetium complexes anchored by scorpionates prepared for radiopharmaceutical application.112 Keane and Harman described exhaustively the coordination chemistry of a new generation of Tt-basic dearomatization agents M(Tp)(L)(7t-acid). 113 Jones et al.114 reported a review on the role of unstable alkane... 

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