Journal
CRYSTENGCOMM
Volume 24, Issue 1, Pages 119-131Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ce01096d
Keywords
-
Categories
Funding
- DST, New Delhi, India [DST/YSS/2015/000993]
Ask authors/readers for more resources
The study demonstrates the crucial role of metal ions in controlling the conformation adopted by cyclen, with planar conformation in Cu-II systems and highly twisted conformation in Ni-II systems. Additionally, antiferromagnetic interactions between the two Ni centers were observed in the dimeric [Ni1] complex as revealed by SQUID magnetic studies.
Serendipitous self-assembly is a potential approach for achieving structurally versatile and unexpected solids with chosen metal-ligand combinations. Cyclen (1,4,7,10-tetraazacyclododecane) is an interesting flexible molecule, well explored for biological and material applications of its metal complexes. The dihedral angle (theta) between four nitrogen atoms of free cyclen is close to 0 degrees. Still, it may vary upon complexation, allowing flexibility to adopt any two conformers, viz., (i) planar and (ii) twisted. The present work establishes the crucial role of metal ions in controlling the conformation adopted by cyclen through metal complexation. SCXRD studies of the complexes of cyclen with Cu-II and Ni-II with halides and pseudohalides as counterions reveal the existence of a planar conformation (theta = similar to 0-3 degrees) for cyclen in Cu-II systems and a highly twisted conformation (hitherto unreported) in Ni-II systems (theta = similar to 52-55 degrees). Further, SQUID magnetic studies for the dimeric [Ni1] complex reveal antiferromagnetic interactions between the two Ni centres.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available