Novel copper complexes based on the thiocyanate bridge – Synthesis, X-ray studies and magnetic properties

Copper thiocyanato complexes and cocaine – a case of ‘black cocaine’

“…Interestingly, in heteroleptic complex units Cu II and thiocyanates can adopt also further coordination possibilities, tetrahedral (N ∧ N)CuNS in [Cu(4‐bpy)(SCN)(NCS)] n (bpy = 4,4’‐bipyridine) vs. square planar (N ∧ N)CuNN coordination in [Cu(2‐bpy)(NCS) 2 ] (2‐bpy = 2,2’‐bipyridine) or Jahn‐Teller distorted octahedral CuS 2 N 2 (N 2 ) in [Cu(NCS)(SCN)(pyrimidine) 2 ] n . However, all of them underline the marked preference of Cu II for N coordination over S coordination, which is largely reversed for Cu I , which preferably coordinates to S ligands, as, for example, in the tetrahedrally configured [Cu I (SCN) 4 ] 3− unit in the mixed valent compound {[Cu II (bpzm)(NCS)][Cu II (bpzm)(MeOH)][Cu I (SCN) 4 ]} n (bpzm =bis(pyrazol‐1‐yl)methane) . Despite to this clear preference of Cu II to N coordination over S coordination, we checked every combination for the [Cu(NCS) 4 ] 2− dianion in (CocH) 2 [Cu(NCS) 4 ] (Figure ) and obtained by far the best results for the structure refinement with a CuN 4 coordination.…”

“…[43] However, all of them underline the marked preference of Cu II for N coordination over S coordination, which is largely reversed for Cu I , which preferably coordinates to S ligands, [44][45][46][47][48][49] 4 ]} n (bpzm = bis(pyrazol-1-yl)methane). [50] Despite to this clear preference of Cu II to N coordination over S coordination, we checked every 4 ] the NÀCuÀN angles sum up to 436.8(2)°, [39] while all other bonding parameters match quite closely those of (CocH) 2 [Cu(NCS) 4 ].…”

Mixed ligand complexes of copper(II), cobalt(II), nickel(II) and zinc(II) with thiocyanate and pyrazole based tetradentate ligand: Syntheses, characterizations and structures

“…Various types of tripodal ligands with aromatic or aliphatic amine and their metal complexes have been synthesized and characterized [18][19][20][21]. Thiocyanate is an ambidentate pseudohalide and can coordinate with metal ions as terminal or bridging ligand to give monomeric, dimeric and polymeric complexes [22][23][24][25][26][27][28][29][30][31]. It has great potential in building up of coordination networks of varied dimensionalities when it acts as bridging ligand [32][33][34].…”

Nitrato, Pseudohalo‐Linked Zn(II)/Cd(II) Schiff‐Base Complexes with 1,3‐Diimine Spacer Group: Syntheses, Crystal Structures, DFT, TD‐DFT and Fluorescence Studies

“…The emission bands for complexes 1 and 2 are nearly identical to those of the other reported Cd(II) or Zn(II) complexes (Table S10(a‐b), see supporting references). [S20,S17] Hence it can be observed that complexes (1‐2) exhibited bathochromically shifted with respect to free salen‐type ligand (H 2 L° Me ) . A closer inspection of N,O‐donor salen‐type ligand (H 2 L° Me ) divulges identical absorption and emission maxima spectra that have been commonly observed especially for ligands having ethoxy group in ortho position of the phenol type moiety .…”