Trinuclear and tetranuclear adduct formation between sodium perchlorate and copper(II) complexes of salicylaldimine type ligands: Structural characterization and theoretical investigation

Use of Cu(II)-di-Schiff bases as metalloligands in the formation of complexes with Cu(II), Ni(II) and Zn(II) perchlorate

“…Using Cu(II) complexes of salen type di-Schiff bases as metalloligands, six examples of single atom oxido bridged star-shaped tetra-nuclear complexes have been reported. These examples include three with M = Na + [20,44,45], one with M = K + [46] and one for each with Cd 2+ [17] and Mn 2+ [21]. Four of these complexes are constituted by the ''metalloligands'' [CuL 2 ] and other two by aother metalloligand [Cu(acacen)] (where [acacen] 2À = N,N 0 -ethylenebis(acety1acetoniminato)).…”

“…Among the divalent first transition elements, Cu(II) forms the most stable complexes with these Schiff bases [10][11][12][13] and therefore, these neutral Cu-chelates have been used frequently to form complex with another metal ions. In most of these complexes, the oxygen atoms of two ''metalloligands'' coordinate to a second ion to result in trinuclear complexes [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. These trinuclear complexes can be homonuclear i.e.…”

“…results in a bent structure. On the other hand, when the counter anions are non-coordinating or weakly coordinating such as perchlorate, three ''metalloligands'' can coordinate to a central metal ion to result in rather unusual star-shaped tetranuclear complexes [17,20,21]. However, trinuclear complexes with such anions are limited and hence no generalization on the shape of the trinuclear molecules could be done.…”

Ligand mediated structural diversity and role of different weak interactions in molecular self-assembly of a series of copper(II)–sodium(I) Schiff-base heterometallic complexes

“…In the present paper we report a set of closely related Cu-Na hetero bimetallic complexes with suitably designed Schiff-base ligand bearing aromatic p-rings. The six coordination sites and two possible ligand centric p -interaction sites on Salicylaldimines with phenoxo groups in the 2 and 2 0 positions render it suitable for coordinating various p-and d-block metal elements and also various alkali-metal ions [57][58][59][60][61][62] and subsequent intra complex supramolecular interaction. In the present study we have chosen Cu and Na along with a set of three closely related ligands H 2 L1, H 2 L2, H 3 L3 and along with reported earlier [57] H 2 L4 (Scheme 1) which differs from each other systematically.…”

Pseudohalide‐Controlled Assemblies of Copper–Schiff Base Complexes with an Encapsulated Sodium Ion: Synthesis, Crystal Structure, and Computational Studies

“…Such a metal-ligand assembly represents a fascinating group of systems known as "ligand complexes", [16,17] which are effective complexing agents not only for p-, d-, and f-block elements but also for alkali-metal ions. Such a metal-ligand assembly represents a fascinating group of systems known as "ligand complexes", [16,17] which are effective complexing agents not only for p-, d-, and f-block elements but also for alkali-metal ions.…”