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In this paper , we select 1,10 - phenanthroline and isophthalic acid or terephthalic acid as the ligand and alkaline earth metals were synthesized by the reaction of a total of nine of the central metal ion magnesium , calcium , strontium , barium complex , they are [Mg (H 2 O) 2 (phen) (Hip) 2 ] (phen) (1), [Mg (H 2 O) 4 phen] (tp) (2), [Mg (dipic) (H 2 O) 3 ] 2H 2 O (3), [Ca (NO 3 ) (phen) 2 (H 2 O)] (NO 3 ) (5), [Sr 2 (phen) 2 (Hip) 4 ] n (6), [Sr 2 (tp) 2 (phen) 2 H 2 O] n (7), [Ba (phen) 2 (H 2 tp) 2 (H 2 O ) 4 < / sub >] n (8) , [ the Ba2 ( phen ) 4 < / sub > ( tp ) of 2 ] n ( 9) ( complex 4 twins ) (phen = the the phenanthroline H 2 ip = isophthalic acid , H 2 tp = the terephthalic acid H 2 dipic = 2,6 - pyridine dicarboxylic acid ) . By elemental analysis, infrared spectroscopy , thermogravimetric and X- ray single crystal diffraction analysis to determine the structure of these complexes . The different configuration of these complexes , complexes 1-5 are zero - dimensional structures , complexes 6,7 and 9 are two - dimensional layered structure, with the object 8 to the three-dimensional structure . In addition , the fluorescent properties of the complexes 1 , 2 , and 7-9 were also tested , and results showed that at room temperature under the conditions capable of emitting a strong blue fluorescence , indicating that these complexes in the optical material has a certain potential value . It is worth mentioning that the the synthesized complexes polymorphs chiral space group C2, can be speculated that the nonlinear optical properties . After the test of the nonlinear optical properties (SHG) , its strength is 1.5 times of KDP under identical conditions show that the crystals in the nonlinear optical material , a certain application .
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