Fine Structures of 8-G-1-(p-YC6H4C Identical with CSe)C10H6 (G = H, Cl, and Br) in Crystals and Solutions: Ethynyl Influence and Y- and G-dependences

Overview

Journal Bioinorg Chem Appl

Publisher Wiley

Date 2009 Oct 8

PMID 19809512

Authors

Satoko Hayashi

Kentaro Yamane

Waro Nakanishi

Affiliations

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Abstract

Fine structures of 8-G-1-(p-YC(6)H(4)C identical with CSe)C(10)H(6) [1 (G = H) and 2 (G = Cl): Y = H (a), OMe (b), Me (c), F (d), Cl (e), CN (f), and NO(2) (g)] are determined by the X-ray analysis. Structures of 1, 2, and 3 (G = Br) are called A if each Se-C(sp) bond is perpendicular to the naphthyl plane, whereas they are B when the bond is placed on the plane. Structures are observed as A for 1a-c bearing Y of nonacceptors, whereas they are B for 1e-g with Y of strong acceptors. The change in the structures of 1e-g versus those of 1a-c is called Y-dependence in 1. The Y-dependence is very specific in 1 relative to 1-(p-YC(6)H(4)Se)C(10)H(7) (4) due to the ethynyl group: the Y-dependence in 1 is almost inverse to the case of 4 due to the ethynyl group. We call the specific effect "Ethynyl Influence." Structures of 2 are observed as B: the A-type structure of 1b changes dramatically to B of 2b by G = Cl at the 8-position, which is called G-dependence. The structures of 2 and 3 are examined in solutions based on the NMR parameters.

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