Diamondoid and Square Grid Networks in the Same Structure. Crystal Engineering with the Iodo···Nitro Supramolecular Synthon

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• 作者：Ram Thaimattam ; C. V. Krishnamohan Sharma ; Abraham Clearfield ; and Gautam R. Desiraju
• 刊名：Crystal Growth & Design
• 出版年：2001
• 出版时间：March 2001
• 年：2001
• 卷：1
• 期：2
• 页码：103 - 106
• 全文大小：188K
• 年卷期：v.1,no.2(March 2001)
• ISSN：1528-7505

文摘

In principle, an organic diamondoid structure could follow from any of four possibilities: a single moleculeof the type AX₄ assembles via X···X interactions; two molecules, e.g. AX₄ and BY₄, assemble via X···Y interactions; eitherof the first two possibilities is modified with appropriate linear spacer molecules; a single molecule AX₂Y₂ assembles viaX···Y interactions. This communication deals with the last possibility, wherein the X···Y link is based on the polarization-assisted I···O₂N synthon. A notable feature of the crystal structure of 4,4'-diiodo-4' ',4' ''-dinitrotetraphenylmethane (1) isthe existence of a divergent mode of iodo-nitro association. The T_d nodes of 1 are interconnected with the I atom bifurcatedby O atoms from two NO₂ groups such that each molecule of 1 is connected to eight others through I···O contacts. Theresult is a combination of 5-fold diamondoid and 3-fold square grid networks. All I···O interactions observed are short andstrong, and there is a pronounced tendency to achieve close packing with the two coexisting networks.