In:
New Journal of Chemistry, Royal Society of Chemistry (RSC), Vol. 47, No. 9 ( 2023), p. 4374-4385
Abstract:
A series of new heteroleptic copper( i ) complexes [Cu(N^N)(P^P)][BF 4 ] (1–6), where N^N is a pyrazole-substituted 2,2′-bipyridine (5-(1 H -pyrazol-4-yl)-2,2′-bipyridine (5-pzbpy, L1), 4,4′-di(1 H -pyrazol-4-yl)-2,2′-bipyridine (4,4′-pz 2 bpy, L2), 5,5′-di(1 H -pyrazol-4-yl)-2,2′-bipyridine (5,5′-pz 2 bpy, L3), and 3,8-di(1 H -pyrazol-4-yl)-1,10-phenanthroline (3,8-pz 2 phen, L4)) and P^P is either oxybis(2,1-phenylene)bis(diphenylphosphane) (POP) or 1,3-bis(diphenylphosphanyl)propane (dppp), were successfully prepared and investigated. The crystal structures of 1, 2, 3 and 6 were determined by single X-ray diffraction. The novel copper( i ) complexes 1, 2 and 3 show turn-on emission sensing for halogen ions. The fluorescence enhancement of the copper( i ) complexes increases in the order of F − 〈 I − 〈 Br − 〈 Cl − , and the differences in fluorescence intensity could be easily distinguished with the naked eye under UV light illumination. The 1 H NMR titration indicated that the interaction involves hydrogen-bond formation between the halide (Cl − , Br − and I − ) and the acidic H of the pyrazole group, with N–H deprotonation occurring at increasing F − concentrations. The result was further confirmed by carrying out theoretical calculations.
Type of Medium:
Online Resource
ISSN:
1144-0546
,
1369-9261
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
1472933-7
