Abstract
Single crystals of the mixed salt L-histidinium(+) L-histidinium(2+) nitrate–hexafluorosilicate have been obtained from aqueous solution and characterized structurally and by infrared and Raman spectroscopy. The title salt crystallizes in the monoclinic system (space group P21, Z=2). The asymmetric unit contains L-histidinium(+) and L-histidinium(2+) cations as well as nitrate and hexafluorosilicate anions. L-histidinium(+) and L-histidinium(2+) cations form short hydrogen bond with an O⋯O distance equal to 2.507(2)Å, thus forming a (L-His+⋯L-His2+) dimeric cation, therefore the formula is correctly given as (L-His+⋯L-His2+)·NO3-·SiF62-. This is the first observation of the (L-His+⋯L-His2+) dimeric cation. The presence of the OH⋯O hydrogen bond of the (L-His+⋯L-His2+) dimeric cation is reflected in the infrared spectrum as a broad absorption band centered at ca. 1300cm−1 caused by stretching vibration of OH bond.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
