Hydrogen-bonded supramolecular synthons in complexes of copper(ii) halides with polymethylene-linked bis(amidino-O-alkylurea) ligands

Hydrogen-bonded supramolecular architectures in (N-(methylpyridin-2-yl)-amidino-O-alkylurea)copper(ii) halides

“…The centrosymmetrically related [Cu(L 3i )X 2 ] molecules are linked by pairs of R 1 2 (6) hydrogen-bonding assemblies, 8 identical to those found as supramolecular synthons 7 in the extended structures of amidino-O-alkylurea copper(II) halides. 2,4,5 The N-H donors are from the two non-coordinated imino nitrogen atoms of the tridentate ligand (N103-H103 and N121-H12B); the chloride acceptor is the axially located anion of the centrosymmetrically related molecule. The resultant Cu … Cu separations are 7.015(1) A (for 1) and 6.894(1) A ˚(for 2).…”

“…A recent development in the rapidly expanding field of crystal engineering has been the design, synthesis and structural characterisation of multi-dimensional, multi-functional materials in which transition metal cationic centres are linked through anions via hydrogen-bonded supramolecular synthons. [1][2][3][4][5][6] By combining the complementary fields of hydrogenbonded crystal engineering 7,8 and inorganic co-ordination polymer construction 9,10 it has been possible to access new extended structures with attractive properties. [3][4][5][6]11 We have recently reported a strategy for the synthesis of 1-D chain and 2-D sheet architectures based on the use of [Cu(L 1 )] 21 [Scheme 1(a)] 2-4 and [Cu(L 2 ) 2 ] 21 [Scheme 1(b)] 2,5,6 cationic centres, respectively.…”

“…[1][2][3][4][5][6] By combining the complementary fields of hydrogenbonded crystal engineering 7,8 and inorganic co-ordination polymer construction 9,10 it has been possible to access new extended structures with attractive properties. [3][4][5][6]11 We have recently reported a strategy for the synthesis of 1-D chain and 2-D sheet architectures based on the use of [Cu(L 1 )] 21 [Scheme 1(a)] 2-4 and [Cu(L 2 ) 2 ] 21 [Scheme 1(b)] 2,5,6 cationic centres, respectively. The [Cu(L 1 )] 21 cations use two pairs of N-H donors, which are set at ca.…”

“…90u to the other two, is used to link two chains into a 1-D tape-like assembly. [2][3][4] The [Cu(L 2 ) 2 ] 21 cations exhibit four-fold connectivity by using their four pairs of N-H donors, which are set at ca. 90u to each other, to form hydrogen-bonds to four anions [Scheme 1 (b)].…”

Binding studies of ( N -(methylpyridin-2-yl)-amidino- O -methylurea)copper(II) complexes to four nitrogenous bases and 5′-GMP

“…Copper(II) complexes containing N-(methylpyridin-2-yl)-amidino-O-methylurea (L) and different anions, Cl À (1) and ClO 4 À (2) were previously prepared and structurally characterized by our group [19,20]. The L ligand, a guanidine derivative, is a chelating N,N,N-tridentate ligand and is of considerable interest owing to their hydrogen-bond mediated interactions [19,[21][22][23][24] and their wide range in biological activities [25][26][27]. Several groups have reported the potent antitumor, antiviral and antifungal activities of some natural and artificial compounds possessing guanidine groups [28][29][30].…”