Bis{[μ-N,N′-bis(salicylidene)-1,4-butanediamine-N,N′,O,O′-copper(II)]-μ-chloro-chloromercury(II)}

Abstract

A new tetranuclear Cu(II)-Hg(II)-Hg(II)-Cu(II) complex, [Cu(2)Hg(2)Cl(4)(C(18)H(18)N(2)O(2))(2)], has been prepared by means of a copper complex found in the literature. The molecular structure of this complex was determined by X-ray diffraction and the Cu-Hg-Hg-Cu chain was seen to be non-linear. The change in magnetic susceptibility with temperature was recorded for this complex and observed to abide by the Curie-Weiss law. The coordination around the Hg(II) ions is square pyramidal. The Cu...Hg bridging distance is 3.5269(7)A.

Synthesis, experimental and theoretical characterization of N,N′-dipyridoxyl (1,4-butanediamine) Schiff-base ligand and its Cu(II) complex

“…Therefore, the O2, N2 and N1 atoms are essentially in the same plane with the Cu atom. But the O1 atom has greater deviation The calculated parameters for H 2 BS and its Cu(II) complex are well in agreement with the previously reported values for the similar salen ligands and complexes [23][24][25][26][27][28][29][30][31][32][33][34][35][36], especially the compounds involving the 1,4-butanediamine bridge [23][24][25][26][27][28][29][30].…”

“…As expected [23][24][25][26][27][28][29][30], the carbon atoms of 1,4-butanediamine bridge are not in the same plane (Fig. 1).…”

“…Some experimentally structural data are available for the Schiffbase ligands [23][24][25] and especially Cu Salen complexes with 1,4-butanediamine N(CH 2 ) 4 N bridge [26][27][28][29][30]. Therefore, determination of structural parameters of the H 2 BS ligand and its Cu(II) complex is of great importance.…”

Playing with different metalloligands [NiL] and Hg to [NiL] ratios to tune the nuclearity of Ni(II)–Hg(II) complexes: Formation of di-, tri-, hexa- and nona-nuclear Ni–Hg clusters

“…These clusters include: a dinuclear complex [(NiL 1 )HgCl 2 ] (1), two trinuclear complexes [(NiL 1 ) 2 HgCl 2 ] (3) and [(NiL 1 ) 2 Hg(N 3 ) 2 ] (4), a hexanuclear complex [{(NiL 2 ) 2 Hg(N 3 ) (l 1,1 -N 3 )} 2 ] (5) and a nonanuclear complex [{(NiL 2 ) 2 Hg(N 3 )(l 1,1 -N 3 ) HgCl 2 } 2 {Hg(N 3 )(l 1,1 -N 3 )}] (6), prepared by reacting HgX 2 (X = Cl or N 3 ) with two metalloligands [NiL 1 ] and [NiL 2 ] with different ring sizes (Scheme 1) and at different molar ratios (Scheme 2) (H 2 L 1 is N,N 0 -bis(salicylidene)-1,2-ethylenediamine and H 2 L 2 is N,N 0 -bis(salicylidene)-1,3-propanediamine). A careful search in the CCDC database (updated November 2013) shows that among the several thousands of complexes prepared with N,N 0 -bis(salicylidene)-diamine-type Schiff bases, only 25 contain Hg as hetero-metal: three chain complexes (two alternating Cu-Hg [8,9] and one Mn-Hg [10]), three tetranuclear (two Hg 2 Cu 2 [11,12] and one Hg 3 Cu [13]), five trinuclear (four HgCu 2 [9,11,14] and one HgMn 2 [10]), thirteen dinuclear (six HgNi, [13,15,16] six HgCu [11,13,[17][18][19][20] and one HgZn [21]) and one mononuclear [22]. Therefore, complexes 5 and 6 are the only known examples presenting nuclearities of six and nine, respectively, in these kind of complexes.…”

Crystal structure analysis of {[μ‐N,N′‐Bis(salicylidene)‐1,3‐propanediaminato]nickel(II)}dichloromercury(II)

“…Mercury is one of the most toxic element for animals and humans because secretion of mercury from the human body is very difficult. These dinuclear complexes have been the subject of considerable interest in our laboratory [7][8][9][10][11].…”