Projects per year
Abstract
Single crystal photocrystallographic experiments and solid state Raman spectroscopy have been used to determine the low temperature, metastable structures of the nickel(II) nitrito complexes [Ni(aep)(2)(eta(1)-ONO) 2] 1#O (aep = 1-(2-aminoethyl) piperidine), [Ni(aem)(2)(eta(1)-ONO)(2)] 2#O (aem = 1-(2-aminoethyl)morpholine), and [Ni(aepy)(2)(eta(1)-ONO)(2)] 3#O (aepy = 1-(2-aminoethyl) pyrrolidine and where the #O denotes the oxygen-bound nitrito metastable molecule). These linkage isomers of the equivalent nitro complexes [Ni(aep)(2)(eta(1)-NO(2))(2)] 1, [Ni(aem)(2)(eta(1)-NO(2))(2)] 2 and [Ni(aepy)2(eta(1)-NO(2))(2)] 3 are formed by LED irradiation at temperatures below 120 K. The behavior of the three complexes upon irradiation is generally similar, but some subtle differences have been observed. From the crystallographic studies all three complexes 1-3 exhibit the endo-nitrito linkage isomer upon irradiation, however, for 3# (a crystal structure that contains components of both 3 and 3#O) an exo-nitrito isomer is also observed. Under conditions of 90-100 K, with blue light, the conversion percentages to the nitrito isomers, 1#O, 2#O and 3#O were 16%, 22% and 30%, respectively. At temperatures below 110 K all three nitrito isomers were stable for over four hours but while 2#O and 3#O could be detected at temperatures down to 30 K, at temperatures below 60 K the metastable structure 1#O appeared to be quenched and only the nitro isomer 1 was identified in the crystal. The solid state Raman spectra for 1#, 2# and 3# confirmed the photocrystallographic results with the nitrito isomers being identified from the O-N-O deformation vibrations.
Original language | English |
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Pages (from-to) | 90-97 |
Number of pages | 8 |
Journal | Dalton Transactions |
Volume | 41 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 2012 |
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Dive into the research topics of 'Photocrystallographic identification of metastable nitrito linkage isomers in a series of nickel(II) complexes'. Together they form a unique fingerprint.Projects
- 5 Finished
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Applying Long-Lived Metastable States in Switchable Functionality via Kinetic Control of Molecular Assembly
Raithby, P. (PI), Burrows, A. (CoI), Lewis, D. (CoI), Marken, F. (CoI), Parker, S. (CoI), Walsh, A. (CoI) & Wilson, C. (CoI)
Engineering and Physical Sciences Research Council
1/11/12 → 30/04/18
Project: Research council
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Directed Assembly Grand Challenge Network
Raithby, P. (PI)
Engineering and Physical Sciences Research Council
1/10/12 → 31/12/16
Project: Research council
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Dynamic Structural Science at the RC@H
Raithby, P. (PI)
Engineering and Physical Sciences Research Council
1/03/11 → 31/08/16
Project: Research council
Equipment
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MC2- X-ray diffraction (XRD)
Material and Chemical Characterisation (MC2)Facility/equipment: Technology type