a semi-batch crystallization system is used to determine growth kinetics and morphology of barium carbonate crystals, under a constant ph value and constant temperature in the various relative supersaturations. results show that crystal growth rate satisfies a first-order kinetic expression at high relative supersaturation, while at relative supersaturation values lower than 3,  the kinetic exp...

In the title compound, C(16)H(13)BrO(3), the dihedral angle formed between the bromo- and methyl-substituted benzene rings is 66.66 (8)°. In the crystal, mol-ecules are linked by inter-molecular C-H⋯O hydrogen bonds, forming a two-dimensional network parallel to the ac plane. The crystal packing is further consolidated by C-H⋯π inter-actions.

In the crystal structure of the title compound, C(5)H(9)N(3) (2+)·2NO(3) (-), the cations and anions are connected by inter-molecular N-H⋯O and C-H⋯O hydrogen bonds, forming a three-dimensional network. The crystal structure is further stabilized by π⋯π inter-actions between pyridinium rings [centroid-centroid distance = 3.775 (4) Å].

In the crystal structure of the title compound, C(13)H(16)N(2)O(4)·H(2)O, inter-molecular N-H⋯O, O-H⋯O and O-H⋯N hydrogen bonds form an extensive three-dimensional network, consolidating the crystal packing. The cyclo-hexane ring adopts a chair conformation.

In the crystal structure of the title compound, C(26)H(27)NO(3), a one-dimensional network of C-H⋯O hydrogen bonds and π-ring inter-actions is responsible for crystal stabilization. Inter-molecular hydrogen bonds and C-H⋯ π inter-actions produce R(2) (2)(10), R(4) (4)(27) and R(4) (4)(29) rings.

In the title compound, C(18)H(18)O(3)S, the C=C double bond exists in an E configuration and the dihedral angle between the two benzene rings is 11.74 (8)°. In the crystal, mol-ecules are linked into a three-dimensional network by C-H⋯O hydrogen bonds. The crystal structure is also stabilized by weak C-H⋯π inter-actions.

5-Ethynyl-1,3-benzenedicarboxylic acid (H2ebdc) reacted with lead(II) acetate trihydrate yields a 1D ladder network, [Pb(ebdc)(MeOH)]2·H2O (1). Removing crystals of 1 from the mother liquor results in a facile single crystal to single crystal transition, yielding 2D [Pb(ebdc)] net (2) with a change in space group from I2/a to P1̄.

In the title compound, C(12)H(14)N(2)O(5), the five-membered 1,3-dioxolane ring has a twisted conformation. In the crystal, N-H⋯O and C-H⋯O hydrogen bonds link the mol-ecules into a two-dimensional network lying parallel to the ab plane. There are also C-H⋯π inter-actions present in the crystal structure.

In the crystal structure of the title compound, C(21)H(14)FN(5), the pyrazole ring forms dihedral angles of 38.0 (1), 40.0 (1) and 28.5 (1)° with the directly attached 4-fluoro-phenyl, pyridine and benzonitrile rings, respectively. The crystal packing is characterized by N-H⋯N hydrogen bonds, which result in a two-dimensional network parallel to the ac-plane.

In the title compound, C16H11NO4, the dihedral angle between the ten-membered chromen-4-one ring system (r.m.s. deviation = 0.0095 Å) and the benzene ring is 86.16 (5)°. In the crystal, mol-ecules are linked into a three-dimensional network by weak C-H⋯O hydrogen bonds. The crystal studied was a non-merohedral twin, with the minor twin component refining to 0.093 (1).