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Crystal structure at 296 and 150 K, vibrational spectra and thermal behaviour of sarcosine sarcosinium nitrate

2012; De Gruyter; Volume: 227; Issue: 12 Linguagem: Inglês

10.1524/zkri.2012.1536

2196-7105

Μ. Fleck, V.V. Ghazaryan, A.M. Petrosyan,

Chemical Thermodynamics and Molecular Structure

Abstract Crystals of sarcosine sarcosinium nitrate (2 Sar · HNO 3 ) have been grown and characterized at 296 and 150 K by single crystal XRD and vibrational spectroscopy. The species was found to be triclinic (space group P -1, a = 5.320(1) Å, b = 6.578(1) Å, c = 15.957(2) Å, α = 95.448(6)°, β = 95.944(6)°, γ = 93.410(6)°, V = 551.6(1) Å 3 , and Z = 2 at 296 K), with a dimeric sarcosine ... sarcosinium cation and a nitrate anion in the asymmetric unit. A very strong hydrogen bond connects the molecules within the dimer. In addition, the tensor of thermal expansion was determined for the temperature range of 200 to 290 K. A strong anisotropy was detected, with thermal expansion along the c -axis approximately 14 times as strong as along the a -axis.