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The role of cations in thermal stability of azo-Fe complexes used as charge-control agents from the standpoint of the crystal structure

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Abstract:

Azo-Fe complexes and their sodium salts are well-known charge-control agents (CCAs) used widely in electrophotography. Aside from the CCA performance, a high thermal stability is also required because pulverized toners are prepared by kneading CCA with various toner components at about 130-180 °C. Therefore, thermal stability has been investigated in azo-Fe complexes from the standpoint of the crystal structure. X-ray analysis revealed that the ammonium cations bridge neighboring azo-Fe complex anions through intermolecular NHO hydrogen bonds. On the other hand, the Na cations are also found to connect different azo-Fe complex anions through the formation of Na complexes. These facts lead us to conclude that the high thermal stability of azo-Fe complexes is attributed to the intermolecular bonds formed by ammonium or sodium cations.

Document Type: Research Article

Publication date: January 1, 2008

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  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.
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