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Structural analysis of alkyl chain conformation in the layered organic–inorganic hybrids $(C_nH_{2n+1}NH_3)_2PbI_4$ (n=12,16,18) by IR spectroscopy

Venkataraman, NV and Barman, S and Vasudevan, S and Seshadri, Ram (2002) Structural analysis of alkyl chain conformation in the layered organic–inorganic hybrids $(C_nH_{2n+1}NH_3)_2PbI_4$ (n=12,16,18) by IR spectroscopy. In: Chemical Physics Letters, 358 (1-2). pp. 139-143.

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Abstract

The conformational order and planarity of alkyl chains in the organic–inorganic hybrid materials $(C_nH_{2n+1}NH_3)_2PbI_4$ , have been examined using infrared spectroscopy. The structure of the inorganic $PbI_4$ slabs in these compounds are invariant with respect to the value of n. These inorganic slabs are sandwiched by bilayers of long alkylammonium chains. The coupling of vibrational modes of all-trans segments of the alkyl chains produce band progressions that are diagnostic of the all-trans conformation. From an analysis of the rocking, twisting, and wagging vibrational mode progressions we establish that irrespective of the value of n all methylene units of the alkyl chain in $(C_nH_{2n+1}NH_3)_2PbI_4$ are in trans registry at room temperature.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 02 Jun 2006
Last Modified: 19 Sep 2010 04:28
URI: http://eprints.iisc.ernet.in/id/eprint/7379

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