In the title complex, [PdBr(2)(C(13)H(18)N(2))(2)], the Pd(II) atom is situated on an inversion center. The tetra-hydro-pyrimidine group of the N-(2,4,6-trimethyl-phen-yl)-1,4,5,6-tetra-hydro-pyrimidine ligand is twisted from the square (PdN(2)Br(2)) coordination plane with a C-N-Pd-Br torsion angle of 81.8 (4)°; this is different from the angle of 43.47 (14)°, reported in a closely related str...

The Cu(II) atom in the title salt, [Cu(C(10)H(24)N(4))(H(2)O)(2)](C(8)H(7)O(2))(2)·H(2)O, is chelated by the four N atoms of the 1,4,8,11-tetra-aza-cyclo-tetra-decane (cyclam) ligand and is coordinated by two water mol-ecules in a Jahn-Teller-type of tetra-gonally distorted octa-hedral geometry. The cations, anions and lattice water mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds to for...

The title compound, {[Cu(2)I(2)(C(12)H(8)N(6))(C(18)H(15)P)(2)]·2CH(3)CN}(n), contains centrosymmetric dinuclear Cu(2)I(2)(PPh(3))(2) units bridged by 3,6-bis-(4-pyrid-yl)-1,2,4,5-tetra-zine ligands lying also across crystallographic inversion centers, giving a chain structure in the ab plane. The distorted tetra-hedral Cu(I) atoms in the dinuclear unit are coordinated by two bridging iodide an...

The Cu(II) atom in the title salt, [Cu(C(10)H(24)N(4))(H(2)O)(2)][CH(3)(CH(2))(8)CO(2)](2)·2H(2)O, is chelated by the four N atoms of the 1,4,8,11-tetra-aza-cyclo-tetra-decane (cyclam) ligand and is coordinated by two water mol-ecules in a Jahn-Teller-type tetra-gonally distorted octa-hedral geometry. The Cu(II) atom lies on a center of inversion. The cations, anions and uncoordinated water mol...

In the title mononuclear complex, [Zn(C(7)H(6)N(5))(2)(H(2)O)(2)], the Zn(II) atom, located on an inversion centre, is in a distorted octa-hedral coordination geometry formed by four N atoms from two chelating 5-(2-pyridyl-meth-yl)tetra-zolate ligands and two O donors from two water mol-ecules. Inter-molecular O-H⋯N hydrogen bonds between the coordinated water mol-ecule and the tetra-zolyl grou...

In the title compound, (C(16)H(36)N)[Fe(C(12)H(8)N(3)O(2))(CN)(3)]·2H(2)O, the tetra-n-butyl-ammonium ion has a tetra-hedral configuration around the N atom, while the Fe(III) atom of the tricyanido[N-(2-pyridyl-carbon-yl)pyridine-2-carboximidato]iron(III) anion adopts a distorted octa-hedral geometry. O-H⋯O and O-H⋯N hydrogen bonds link the components in the crystal structure.

Eriophyoid mites from Qinghai Province, northwestern China were studied herein. Up to now, only six species have been reported from Qinghai Province. In field surveys, 17 eriophyoid mite species were collected, among which nine species were found new to science. The new species and their host plants are listed as follows: Acaphyllisa tuberculumaesp. n. on Populus sp. (Salicaceae); Proiectus xin...

The asymmetric unit of the title compound, (C(13)H(17)N(2)O)(2)[ZnCl(4)]·2H(2)O, contains two tetra-hydro-harmine cations, one tetra-chloro-zincate(II) anion and two water mol-ecules. In the cations, the two 1H-indole ring systems are essentially planar, with maximum deviations of 0.016 (2) and 0.018 (2) Å, and both tetra-hydro-pyridinium rings show a half-chair conformation. The Zn(II) complex...

The crystal structure of the title compound, C(15)H(14)N(4), contains chains of coplanar tetra-zole rings with the chain direction along b. These are formed through weak hydrogen bonds, donated by the tetra-zole H atoms and by one of the H atoms of the methyl-ene group, and accepted by two neighbouring N atoms of the adjacent tetra-zole ring. The chains are connected to each other in a staircas...