<span style="font-size:14.0pt;font-family: "Times New Roman","serif";mso-fareast-font-family:"Times New Roman";mso-ansi-language: EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA" lang="EN-US">Structure and metal binding of a 1<i style="mso-bidi-font-style:normal">H</i>-1,5-benzodiazepine</span>

Abstract

The X-ray crystal structure of 2,3-dihydro-2,2,4-trimethyl-1<i style="mso-bidi-font-style:normal">H</i>-1,5-benzodiazepine (L), which has medicinal effect on the central nervous system, has been determined. The solid state conformation of the seven-membered heterocyclic ring in L is found to be somewhat like an armchair. Its modes of binding to three metal ions – Ni²⁺, Cu²⁺ and Zn²⁺– are identified. In cases of Ni²⁺and Cu²⁺,the seven-membered heterocyclic ring in L opens up following a hydrolysis of the imino bond promoted by these two metal ions. Zn²⁺cannot effect such ring opening.