Molecular and crystal engineering of a new class of inorganic cadmium-thiocyanate polymers with host–guest complexes as organic spacers, controllers, and templates

Zhang, Hong; Wang, Ximin; Zhang, Kecong; Teo, Boon K.

doi:10.1016/s0010-8545(98)00270-7

Cited by 290 publications

(66 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Research on design and synthesis [1][2][3] of mono-, bi-, and polynuclear coordination compounds of cadmium(II) [4][5][6][7][8][9][10] continues unabated for the preparation of functional materials [11][12][13][14][15] with interesting electronic and optoelectronic properties [15][16][17][18]. Exploiting the diversity in coordination environments around this 4d 10 ion, different metal-organic frameworks [19][20][21] may be accessed using a variety of organic coligands along with different inorganic/organic bridges.…”

Section: Introductionmentioning

confidence: 99%

Syntheses, structures, and properties of two binuclear cadmium(II) iodides containing a bis(tridentate) Schiff base/tetradentate tripodal amine: control of coordination numbers by varying ligand matrices

et al. 2011

View full text Add to dashboard Cite

Two binuclear cadmium(II) iodide compounds of the types [Cd 2 (L1)(I) 4 ] (1) and [(L2)Cd(l-I)CdI 3 ] (2) [L1 = N,N 0 -(bis(pyridine-2-yl)formylidene)triethylenetetramine and L2 = tris(2-aminoethyl)amine] are synthesized and characterized. X-ray structural study shows that each cadmium(II) in 1 has a distorted square pyramidal geometry with a CdN 3 I 2 chromophore and that L1 behaves as a binucleating bis(tridentate) ligand bridging the metal centers with iodides remaining as terminals. In 2, one cadmium(II) adopts a distorted tetrahedral geometry with a CdI 4 chromophore surrounded by four iodides, while the other has a distorted trigonal bipyramidal environment with CdN 4 I chromophore bound by four N atoms of L2 and one bridging iodide. Weak C-HÁÁÁp interactions in 1 result in an infinite 1D chain; however, such weak non-covalent interactions are absent in 2. The Schiff base complex, 1, shows high-energy intraligand 1 (p-p*) fluorescence in DMF solution at room temperature, whereas compound 2 containing tripodal amine is fluorescent-inactive.Keywords Cadmium(II) iodide Á Schiff base bridge Á Tripodal amine Á X-ray structure Á Luminescence

show abstract

Section: Introductionmentioning

confidence: 99%

Syntheses, structures, and properties of two binuclear cadmium(II) iodides containing a bis(tridentate) Schiff base/tetradentate tripodal amine: control of coordination numbers by varying ligand matrices

et al. 2011

View full text Add to dashboard Cite

show abstract

“…The SCN -group is coordinated to mercury through the sulphur atom and to three potassium atoms through nitrogen. This scheme is denoted IVc [2]. To our knowledge, the present tetradentate mode had never been observed.…”

Section: Discussionmentioning

confidence: 78%

Crystal structure of dipotassium dibromo-bis(thiocyanato)mercurate(II), K2[HgBr2(SCN)2]

Gacemi¹,

Benbertal²,

Gautier-Luneau³

et al. 2005

Zeitschrift Für Kristallographie - New Crystal Structures

View full text Add to dashboard Cite

C 2Br2HgK2N2S2, hexagonal, P63/m (no. 176), a = 12.896(1) Å, c = 11.293(1) Å, V = 1626.5 Å 3 , Z = 6, Rgt(F) = 0.037, wRref(F 2 ) = 0.064, T = 293 K. Source of materialK2HgBr2(SCN)2 was prepared from 1 mmol of Hg(SCN)2 which was dissolved in 50 mL of water with the stoichiometric amount of KBr. The mixture was refluxed during one hour and the resulting clear solution was slowly evaporated at room temperature, yielding millimeter sized, transparent prisms of K2HgBr2(SCN)2. Crystals were filtered off, washed with a small amount of methanol and dried at room temperature. DiscussionThe mercury atom is coordinated to two bromine atoms and two sulfur atoms (figure, top). The thiocyanate bonding is coherent with an HSAB explanation (Hard and Soft Acids and Bases). The metal coordination environment can be described as a distorted tetrahedron, with S-Hg-S and Br-Hg-Br angles equal to 127.3(1)°and 97.19(4)°, respectively. Among mercury compounds, the present environment is not unusual. In the thiocyanate chemistry, we already observed it in Hg3CdCl2(SCN)6 [1]. Thus, the structure could be described as a packing of [HgBr2(SCN)2] 2-complex anions and potassium cations. However, due to the coordination of the SCN -group, a 3D description of the crystal structure taking the potassium coordination into account seems to be a better one. The SCN -group is coordinated to mercury through the sulphur atom and to three potassium atoms through nitrogen. This scheme is denoted IVc [2]. To our knowledge, the present tetradentate mode had never been observed. The K1 environment is a trigonal prism formed by four nitrogen and two bromine atoms. The K2 environment is an octahedron formed by three nitrogen and three bromine atoms. Finally, the K3 surrounding is an octahedron, elongated along the c axis, formed by six bromine atoms. The figure, bottom, shows the 3D interconnection of the metal cations. The most simple description is as follows. The K2 octahedra are connected through three Br bridges forming dimers. These dimers are linked through three K2-(NCS)Hg(SCN)-K2 bridges, a connection becoming very rigid through K1-N bonds. This leads to chains parallel to the c axis:The linking K3-[Br2]3-K3 unit is also parallel to c. These two parallel chains are connected directly through Hg-Br2 bonds and indirectly through Br1-Hg, K1-Br2 bonds, resulting in a very compact 3D structure.

show abstract

“…SCN -is a highly versatile ambidentate ligand with fifteen modes of coordination: two terminal modes and thirteen multidentate bridging modes, ranging from bi-to hexadentate [5]. The present pentadentate mode (Va in ref [5]) is rather rare, but has already been observed in BaCl(SCN) and Na 4Mg(SCN)6 [1]. The chlorine atoms are m3-coordinated under forming tetrahedra.…”

Section: Discussionmentioning

confidence: 97%

Crystal structure of lead chloride thiocyanate, PbCl(SCN)

Gacemi¹,

Benbertal²,

Gautier‐Luneau³

et al. 2005

Zeitschrift Für Kristallographie - New Crystal Structures

View full text Add to dashboard Cite

Molecular and crystal engineering of a new class of inorganic cadmium-thiocyanate polymers with host–guest complexes as organic spacers, controllers, and templates

Cited by 290 publications

References 71 publications

Syntheses, structures, and properties of two binuclear cadmium(II) iodides containing a bis(tridentate) Schiff base/tetradentate tripodal amine: control of coordination numbers by varying ligand matrices

Syntheses, structures, and properties of two binuclear cadmium(II) iodides containing a bis(tridentate) Schiff base/tetradentate tripodal amine: control of coordination numbers by varying ligand matrices

Crystal structure of dipotassium dibromo-bis(thiocyanato)mercurate(II), K2[HgBr2(SCN)2]

Crystal structure of lead chloride thiocyanate, PbCl(SCN)

Contact Info

Product

Resources

About