A Pedagogical Illustration of the Determination of the Nature and Strength of Bonds in Crystalline Compounds from X-ray Diffraction and Infrared Spectroscopy Studies

2001 ◽  
Vol 6 (2) ◽  
pp. 73-77 ◽  
Author(s):  
Pierre Couchot ◽  
Sandrine Monney ◽  
George D. Sturgeon ◽  
Michael Knorr
Keyword(s):  
Infrared Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spectroscopy Studies

Synchrotron X-ray Diffraction and Infrared Spectroscopy Studies of C60H18under High Pressure

2010 ◽  
Vol 1 (4) ◽  
pp. 714-719 ◽  
Author(s):  
Honglei Ma ◽  
Xuemei Zhang ◽  
Bingbing Liu ◽  
Quanjun Li ◽  
Qifeng Zeng ◽  
...  
Keyword(s):  
High Pressure ◽  
Infrared Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spectroscopy Studies

scholarly journals Different Coordination Modes of a Tripod Phosphine in Gold(I) and Silver(I) Complexes

1999 ◽  
Vol 6 (4-5) ◽  
pp. 211-221 ◽  
Author(s):  
P. Sevillano ◽  
M. E. García ◽  
A. Habtemariam ◽  
S. Parsons ◽  
P. J. Sadler
Keyword(s):  
Mass Spectrometry ◽  
Infrared Spectroscopy ◽  
Nmr Spectroscopy ◽  
Coordination Geometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fab Mass Spectrometry ◽  
Intramolecular Distance ◽  
Spectroscopy Studies ◽  
Linear Coordination

The following gold(I) and silver(I) complexes of the tritertiary phosphine 1,1,1- tris(diphenylphosphinomethyl)ethane, tripod , have been synthesised: Au3(tripod)X3 [X = Cl(1), Br(2), I(3)]; [Au3  (tripod)2Cl2  ]Cl (4); Au(tripod)X [X = Br(5), I(6)]; Ag3(tripod)(NO3)3 (7), Ag(tripod)NO3 (8). They were characterized by X-ray diffraction (complexes 2, 3 and 4), P31 NMR spectroscopy, electrospray and FAB mass spectrometry and infrared spectroscopy. Complexes 2 and 3 show a linear coordination geometry for Au(I), with relatively short Au-P bond distances. Complex 3 has a Au•••Au intramolecular distance of 3.326 A° , while complex 2 had a short Au•••Au intermolecular interaction of 3.048 A° . Complexes 4-6 were found by P31 NMR spectroscopy studies to contain a mixture of species in solution, one of which crystallised as [Au3(tripod|)2Cl2]Cl which was shown by X-ray diffraction to contain both tetrahedral and linear Au(I), the first example of a Au(I) complex containing such a mixture of geometries. The reaction of [Au3(tripod)Cl3] (1) with tripod led successfully to the formation of [Au3(tripod)Cl3][Au3(tripod|)2Cl2]+ and [Au3(tripod|)3Cl]2+ . The silver(I) complexes, 7 and 8 appear to contain linear and tetrahedral Ag(I), respectively.

Determination of Hemp Crystallinity by Different Evaluation Method

2013 ◽  
Vol 781-784 ◽  
pp. 2730-2733
Author(s):  
Jie Zhang ◽  
Jian Chun Zhang ◽  
Hua Zhang
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Infrared Spectroscopy ◽  
Empirical Formula ◽  
Evaluation Method ◽  
Deconvolution Method ◽  
X Ray Diffraction ◽  
Hemp Fiber ◽  
X Ray ◽  
Peak Deconvolution

This paper used X-ray diffraction, infrared spectroscopy and nuclear magnetic resonance (NMR) to determine the crystallinity of hemp fiber. The results show that the order of crystallinity is Segal method > Peak deconvolution method > Newman method > Infrared spectroscopy method. Both empirical formula and peak deconvolution method lead to deviation of crystallinity value. However, there is a less inaccuracy in peak deconvolution than empirical formula and could get detailed crystal parameters. Therefore, peak deconvolution method is more suitable than empirical formula for determination of crystallinity of hemp fiber.

X-ray diffraction and infrared spectroscopy studies on crystal and lamellar structure and cho hydrogen bonding of biodegradable poly(hydroxyalkanoate)

2006 ◽  
Vol 14 (4) ◽  
pp. 408-415 ◽  
Author(s):  
Harumi Sato ◽  
Rumi Murakami ◽  
Jianming Zhang ◽  
Yukihiro Ozaki ◽  
Katsuhito Mori ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectroscopy ◽  
Lamellar Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Biodegradable Poly ◽  
Spectroscopy Studies

Determination of Molecular Orientation of Uniaxially Stretched Polyamide Fibers by Polarized Infrared Spectroscopy: Comparison of X-Ray Diffraction and Birefringence Methods

2005 ◽  
Vol 59 (7) ◽  
pp. 897-903 ◽  
Author(s):  
N. Vasanthan
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Molecular Orientation ◽  
Indirect Method ◽  
X Ray Diffraction ◽  
Crystalline Orientation ◽  
X Ray ◽  
Polarized Infrared Spectroscopy ◽  
Polyamide Fibers

Polarized infrared (IR) spectroscopy has been used to determine the crystalline and amorphous orientation of polyamide fibers. The transition moment angle of the band at 936 cm−1 of PA66 was determined to be 48° using IR spectroscopy and birefringence measurement. The crystalline orientation of PA66 fibers was estimated from the band at 936 cm−1 while the amorphous orientation of PA66 fibers was obtained by an indirect method. The α crystalline orientation of PA6 has been obtained using the band at 930 cm−1 and the amorphous orientation of PA6 has been determined using the band at 1124 cm−1. Crystalline orientation increased rapidly at low draw ratios (DR < 3) and increased slowly at higher draw ratios (DR > 3) for both PA66 and PA6 fibers, while the amorphous orientation increased slowly throughout the whole extension range for PA66 fibers. A good correlation was found between the crystalline orientation values obtained by infrared spectroscopy and other methods such as X-ray diffraction for PA66 and PA6 fibers. On the basis of this observation, it has been concluded that polarized infrared spectroscopy can be used reliably to measure the orientation of polyamide fibers without combining with other techniques.

Sign in / Sign up

Export Citation Format

Share Document