enqueue google fonts

I am trying to enqueue two google fonts to a theme I am building. So far in the functions.php file I have the code:

function google_fonts() {
	$query_args = array(
		'family'  =>  'Merriweather:400,700italic|Open+Sans:400,700,400italic,700italic',
	);
	wp_register_style( 'google_fonts', add_query_arg( $query_args, "//fonts.googleapis.com/css" ), array(), null );
}

add_action( ‘wp_enqueue_scripts’, ‘google_fonts’ );

and I am using SASS:

$sans-serif: 'Open Sans', Arial, sans-serif;

$serif: ‘Merriweather’, serif;

and an example of CSS is:

`.quote p {
font-family: ‘$serif’;
font-size: 1.5em;
line-height: 1.8em;
font-style: italic;
text-align: center;
color: $primaryColor;
padding: 0px 30px;
}

I can’t get the font “Merriweather” to work. Does anyone have any idea where I am going wrong?