Issue 20, 2012

The unexpected but predictable tetrazole packing in flexible 1-benzyl-1H-tetrazole

Abstract

The crystal structure of 1-benzyl-1H-tetrazole, C8H8N4, was undertaken to study the geometry and intermolecular interactions of the (1-substituted) 1H-tetrazole moiety. It crystallizes in the monoclinic space group P21 with unit cell dimensions a = 7.6843(5), b = 5.5794(4), c = 9.4459(7) Å, β = 100.949(4)°, V = 397.61(5) Å3, Z = 2, density (calculated) = 1.338 gcm−3. The packing of the molecules in the crystal structure is dominated by a number of weak intermolecular hydrogen bonds of the type CH⋯N and CH⋯C. This results in segregated infinite S-shaped layers of phenyl and tetrazole rings where each tetrazole ring is coordinated by six others. There are no π⋯π interactions. A group developing crystal structure prediction methods for highly flexible molecules was challenged to predict this Z′ = 1 crystal structure from the chemical diagram. The experimental structure was found, having essentially the same lattice energy (ΔElatt ∼0.1 kJmol−1) as the most stable computationally generated structure, which had the expected π⋯π interaction and no segregation of tetrazole rings. The successful crystal structure prediction confirms that the intra and intermolecular interactions of the tetrazole group can be adequately represented by single molecule ab initio-based methods, which represent the electrostatic effects of the lone pairs and π electron density. The predicted structure provided a starting model, which was easily refined in SHELXL-97, providing indisputable proof that it is an accurate reproduction of the crystal structure.

Graphical abstract: The unexpected but predictable tetrazole packing in flexible 1-benzyl-1H-tetrazole

Supplementary files

Article information

Article type
Paper
Submitted
12 Jun 2012
Accepted
03 Aug 2012
First published
06 Aug 2012

CrystEngComm, 2012,14, 6441-6446

The unexpected but predictable tetrazole packing in flexible 1-benzyl-1H-tetrazole

J. Spencer, H. Patel, J. J. Deadman, R. A. Palmer, L. Male, S. J. Coles, O. G. Uzoh and S. L. Price, CrystEngComm, 2012, 14, 6441 DOI: 10.1039/C2CE25940K

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements